Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
294 Cards in this Set
- Front
- Back
|
The law that governs wastewater analysis is?
a) Safe Drinking Water Act b) Resource Conservation and Recovery Act c) Clean Water Act d) Federal Water Pollution Control Act |
c) Clean Water Act |
|
|
Compliance monitoring analysis of wastewater can be performed by:
a) Any method b) Any method in Standard Methods c) Any method in the 18th Edition of Standard Methods d) Any method listed in 40 CFR 136 |
Any method listed in 40 CFR 136 |
|
|
The proper collection and preservation for samples collected for mercury analysis is:
a) Collect in a Mason jar and send to the lab b) Collect in a pre-cleaned glass or polyethylene container c) Add acid d) Add nitric acid to pH<2 |
b) Collect in a pre-cleaned glass or polyethylene container - and - d) Add nitric acid to pH<2. |
|
|
Which parameters should never be sent to a commercial laboratory because of maximum holding time violations?
a) Sulfate b) D. O. c) Sulfite d) Residual Chlorine |
b) D.O. - and - c) Sulfite - and - d) Residual Chlorine |
|
|
Calculate the percent solids reduction in a primary clarifier if the influent TSS is 400 mg/l and the effluent from the clarifier is 160 mg/l. |
60% |
|
|
Exhaust from a chlorinator room should be taken from:
a) Anywhere b) At floor level c) Close to the entrance d) In the Ceiling
|
b) At floor level |
|
|
In certain situations, a supervisor encourages the employees to make their own decisions. This is considered to be:
a) against the rules to follow past experiences in decision making b) bad form because the supervisor eventually loses control c) highly desirable because it encourages employee growth and frees the supervisor for other tasks. d) passing the buck |
c) Highly desirable because it encourages employee growth and frees the supervisor for other tasks. |
|
|
Valves should be closed slowly to avoid:
a) excessive head loss b) excessive wear c) injury to the operator d) water hammer |
d) water hammer |
|
|
What is the most likely cause of rising sludge in a clarifier:
a) low D.O. and pH levels in the aeration tanks b) young sludge c) over aeration in the aeration tanks has sheared the floc d) denitrification occuring |
d) denitrification occuring |
|
|
What happens when chlorine reacts with hydrogen sulfide gas:
a) amplified and made worse b) diluted c) not affected by the chlorine d) oxidized and made odorless |
d) oxidized and made odorless. |
|
|
What process change is most likely to improve the settling performance of primary settling tanks that are being operated at flows greater than their design flow:
a) chlorinate the supernatant return from sludge handling processes b) install flow equalization basins ahead of primary tanks c) pre-aerate raw wastewater flow d) recycle sludge from the secondary clarifiers to the primary tanks for settling |
b) install flow equalization basins ahead of the primary tanks |
|
|
Word has just come down from the top that operating funds are being cut. How should this be handled?
a) cut the supplies and repairs to balance the budget b) fire some of the less productive, older employees c) keep it quiet and do what you have to do, "the less said, the better" d) let the other personnel know what the situation is and ask for their help |
d) let the other personnel know what the situation is and ask for their help |
|
|
Given the data below, what is the most likely cause of the problem? Data: Wet well influent flow is high due to rain. Wet well level is remaining high. Lead pump is running. Lag pump is running. Lead pump check valve arm is up. Lag pump check valve arm is down. Force main pressure remains at normal range for one pump. Low level pressure switch is normal. High level pressure switch is normal. Electrical controls are in automatic mode.
a) lead pump is clogged b) force main pressure is too high c) lag pump is clogged d) both pumps are clogged |
c) lag pump is clogged |
|
|
Which activated sludge process could handle shock loads of dairy waste most effectively:
a) a plug flow system b) a high rate system c) a complete mix system d) a tapered aeration system |
c) a complete mix system |
|
|
The best approach to resolving complaints involving the operation of a wastewater plant is to:
a) explain the problem and proposed solution and offer to conduct a tour of the plant for those complaining b) keep all persons except operating personnel out c) never admit there is a problem or cause for the complaint d) publicize the problem as much as possible |
a) explain the problem and proposed solution and offer to conduct a tour of the plant for those complaining |
|
|
What is the purpose of heating and mixing a primary anaerobic digester:
a) to eliminate all oxygen present b) to increase the digestion rate c) to keep methane gas in suspension d) to prevent grit from settling to the bottom of the digester |
b) to increase the digestion rate |
|
|
Mechanical ventilation of the lift station is required to:
a) lower the temperature b) reduce chlorine demand c) minimize the presence of harmful gases d) increase D.O. in raw wastewater |
c) minimize the presence of harmful gases |
|
|
Granular filter media used to filter wastewater can become coated with a biological slime due to the ____ in the wastewater.
a) alkalinity b) hardness c) pH d) soluble BOD and ammonia |
d) soluble BOD and ammonia |
|
|
One opening has become available that would be an advancement to any one of the three qualified eager employees. What is the best way to handle this situation?
a) hire an outsider to fill the position b) pick one and normally all personnel of the change c) split the work between the three and leave the position open d) talk to the three as a group, explain the situation, interview them individually, and make your selection, then notify all personnel of the change |
d) talk to the three as a group, explain the situation, interview them individually, and make your selection, then notify all personnel of the change |
|
|
Calculate pounds of BOD per day entering the trickling filter: Influent wastewater flow is 1.5 MGD Influent wastewater BOD is 150 mg/L There is a 30% reduction in BOD through primary treatment.
a) 560 lb/day b) 879 lb/day c) 1310 lb/day d) 1880 lb/day |
c) 1310 lb/day |
|
|
A valve that allows water to flow in one direction only is a _____ valve.
a) check b) gate c) globe d) plug |
a) check |
|
|
Which of the following pieces of equipment should be calibrated daily at a treatment plant:
a) fixed location dissolved oxygen probe b) continuous recording chlorine residual analyzer c) continuous recording pressure gauges d) portable dissolved oxygen probe |
d) portable dissolved oxygen probe |
|
|
If the sewer rate is $25 for the first 500 ft and all wastewater generated over that amount is billed at a rate of $2.50 per 100 ft3, how much would a customer generating 1200 ft2 of wastewater be billed?
a) $25 b) $32 c) $36 d) $42.50 |
d) $42.50 |
|
|
Information on preventive maintenance procedures, recommended maintenance frequencies and replacement parts for a specific piece of equipment installed at a plant can be obtained from:
a) record drawings b) experience at the particular plant c) lab records d) manufacturer's operation and maintenance manuals |
d) manufacturer's operation and maintenance manuals |
|
|
The rotational speed of air-driven rotating biological contactor (RBC) is controlled by:
a) air temp b) air velocity c) air volume d) diffuser head setting |
c) air volume |
|
|
Wastewater is flowing through a 42 in diameter pipe at a rate of 6.5 ft/sec. What is the flow in ft3/sec?
a) 18 ft3/sec b) 36 ft3/sec c) 62 ft3/sec d) 520 ft3/sec |
c) 62 ft3/sec |
|
|
How much does 7.5 gal of water weigh in lbs?
a) 50.8 lbs b) 62.5 lbs c) 75.6 lbs d) 77.3 lbs |
b) 62.5 |
|
|
Approximately how many gallons of wastewater would 600 ft of 6 in pipe hold?
a) 740 gallons b) 880 gallons c) 900 gallons d) 930 gallons |
b) 880 gallons |
|
|
If departments are defined based on jobs to be done this is known as organization by:
a) customer b) function c) product d) territory |
b) function |
|
|
Your wastewater treatment plant serves 1100 people. The flow average is 80,000 gpd. The approximate daily flow contribution per person is:
a) 14 gpd/cap b) 73 gpd/cap c) 80 gpd/cap d) 140 gpd/cap |
b) 73 gpd/cap |
|
|
A chlorine demand test will show the:
a) safe amount of chlorine that may be fed without killing fish b) number of kilograms or pounds of chlorine required to kill 100% of coliforms c) amount of chlorine required to give a desired residual after a given time d) amount of chlorine required to satisfy the biochemical oxygen demand |
c) amount of chlorine required to give a desired residual after a given time. |
|
|
Centrifugal pump parts include:
a) diaphragm b) impeller c) piston d) rotor |
b) impeller |
|
|
Given the data below, what is the most likely cause of a low D.O. level in an activated sludge aeration tank with a diffused aeration system problem? Data: Blower air rate output is high Organic load is normal Hydraulic load is normal High turbulence in a specific area of aeration tank
a) aeration system has leaking or broken pipes b) excessive air bubble shearing by diffusers c) return sludge rate too high d) under aeration because of low blower speed |
a) aeration system has leaking or broken pipes |
|
|
What test is typically never performed on wastewater influent:
a) BOD b) fecal coliform c) suspended solids d) pH |
b) fecal coliform |
|
|
A 240 gpm mixed media filter operated at a rate of 2 gpm/ft2 is backwashed at a rate of 15 gpm/ft2. The backwash lasts for 5 min. How many gallons of backwash water were used:
a) 8000 gal b) 9000 gal c) 6000 gal d) 6200 gal |
b) 9000 gal |
|
|
Jar tests may be used to determine the optimum dosage of:
a) polymer b) BOD c) oil and grease d) volatile acids |
a) polymer |
|
|
What mixed liquor characteristics indicate a healthy activated sludge process?
a) black color and a strong, unpleasant odor b) brown color, frothy appearance, and musty odor c) brown color and thick, dark brown foam d) light tan and light fluffy foam |
b) brown color, frothy appearance, and musty odor |
|
|
What term means that the employee reports to one specific supervisor and that the delegation of authority comes from one particular supervisor to the employee?
a) unity of command b) span of supervision c) organizational chart d) formal organization |
d) formal organization |
|
|
The part of the chlorine cylinder designed to melt at 150 to 162 F to prevent the cylinder from exploding in the event of a fire is the:
a) fusible plug b) needle valve seat c) tank head d) needle valve |
a) fusible plug |
|
|
Industrial waste that can be treated by biological processes includes:
a) metal finishing waste b) paper product waste c) plating waste d) pesticide waste |
b) paper product waste |
|
|
Chloramines are:
a) combined chlorine b) enzymes c) found in polluted air d) free chlorine |
a) combined chlorine |
|
|
The pressure against which a pump must operate is measured in terms of:
a) ft-lb b) gal c) hp d) psi |
d) psi |
|
|
How many pounds of chlorine gas are necessary to treat 4 MGD of wastewater at a dosage of 2 mg/L:
a) 61 lbs b) 65 lbs c) 67 lbs d) 69 lbs |
c) 67 lbs |
|
|
An air-gap device is used to:
a) in crease oxygen content in manholes b) prevent contamination of potable water systems c) prevent excessive vibration in pipe joints d) ventilate manholes |
b) prevent contamination of potable water systems |
|
|
In the membrane filter method, the number of coliforms is estimated by the:
a) number of colonies grown b) number of negative tubes c) number of positive tubes d) sum of positive and negative tubes |
a) number of colonies grown |
|
|
When an employee breaks the rules and requires discipline, who is responsible for administering it?
a) fellow staff b) personnel office c) supervisor d) upper management |
c) supervisor |
|
|
The amount of BOD in sludge entering a digester is an indirect measure of the:
a) amount of the sample that will evaporate when standing b) "food" available for bacteria in the digester c) number of bacteria entering the digester d) primary effluent suspended solids |
b) "food" available for bacteria in the digester |
|
|
The rock in a trickling filter is usually placed:
a) directly in the ground b) directly in a concrete slab c) on a tile under drain system d) on a rubber tile floor |
c) on a tile under drain system |
|
|
In electrical circuits a _______ is used to reduce the voltage where necessary.
a) ammeter b) thermal overload c) transformer d) voltmeter |
c) transformer |
|
|
Compute the lagoons detention time: Surface area = 6 acres Avg Depth = 3 ft Avg daily flow (influent) = .25 MGD
a) 3 days b) 8 days c) 24 days d) 29 days |
c) 24 days |
|
|
Which one of the following are normal conditions for a manual control gas chlorination system:
a) increase alkalinity b) increase in organic matter c) increase in phosphate concentration d) decrease in pH |
b) increase in organic matter |
|
|
Steel tanks may be protected from rusting by:
a) alternately wetting and drying the walls b) maintaining humidity in tank c) protective coating d) washing tank walls |
c) protective coating |
|
|
If packing is not maintained properly:
a) cavitation damage will result b) the impeller will corrode c) loss of suction will occur due to air being allowed to enter pump d) the pump efficiency will increase |
c) loss of suction will occur due to air being allowed to enter pump |
|
|
Disaster plans should be developed to deal with which of the following events:
a) broken sewers b) floods c) power outages d) pump stoppages |
b) floods |
|
|
A positive displacement sludge pump should never be placed into operation:
a) without being primed b) with the discharge valve closed c) with the discharge valve open d) without checking for proper impeller rotation first |
b) with the discharge valve closed |
|
|
If the bearings on horizontal centrifugal pumps are over lubricated, the most important effect is that the extra lubricant:
a) will result in smoother and more efficient operation of the pump b) will not make any difference in the operation of the pump c) will be wasted d) may cause overheating and possible failure of the bearings |
d) may cause overheating and possible failure of the bearings |
|
|
Hydrogen sulfide gives off an odor similar to:
a) ammonia b) chlorine gas c) rotten eggs d) decayed wood |
c) rotten eggs |
|
|
The gas most commonly associated with septic wastewater is:
a) carbon dioxide b) carbon monoxide c) hydrogen sulfide d) methane |
c) hydrogen sulfide |
|
|
Chlorine gas is:
a) colorless b) heavier than air c) nontoxic d) odorless |
b) heavier than air |
|
|
When preparing for a public open house, what following in-plant arrangements must be made?
a) a printed handout is available and up to date b) adequate coffee cups and ash trays are available c) all pump casings are repainted d) visitor safety is ensured |
d) visitor safety is ensured |
|
|
Why are check valves used in conjunction with centrifugal pumps?
a) to equalize the pressure on both sides of the impeller b) to prevent wastewater in the suction line from becoming air-locked c) to prevent wastewater in the discharge line from flowing back through the pump d) to regulate the rate of wastewater flow through the discharge pipe |
c) to prevent wastewater in the discharge line from flowing back through the pump |
|
|
The addition of chlorine, acid, carbon dioxide, or sulfuric acid will ____ the pH of wastewater?
a) neutralize b) lower c) increase d) have no effect on |
b) lower |
|
|
The code of Federal Regulations is updated daily in what publication?
a) EPA Website b) Federal Register c) CFR d) DMR |
b) Federal Register |
|
|
Your monthly regulatory reporting data is reported to the state on what document?
a) DMR b) NPDES c) EPA form 1040 d) MOR |
a) DMR |
|
|
Samples collected because they are required by an NPDES permit and for which there may be limitations are called ____ samples.
a) Permit b) Process Control c) Grab d) Composite |
a) Permit |
|
|
In what document can the legal sample preservation techniques and holding times be found?
a) Title 40 CFR Part 141 b) Title 40 CFR Part 136 c) Title 29 CFR Part 1910 d) Standard Methods |
b) Title 40 CFR Part 136 |
|
|
What is the goal of the primary wastewater treatment phase?
a) remove trash and grit b) remove pathogenic organisms c) protect the public health d) remove floatable and settleable solids |
d) remove floatable and settleable solids |
|
|
Why is wastewater disinfected?
a) for sterilization b) to remove pathogenic organisms c) for odor control d) for color removal |
b) to remove pathogenic organisms |
|
|
What is the predominant biological organism, responsible for stabilizing waste material in wastewater treatment?
a) bacteria b) algae c) protozoa d) fungi |
a) bacteria |
|
|
According to Title 29 CFR Part 1910.146(c)(i)(C), which of the following gases shall be checked first in a confined space atmosphere?
a) hydrogen sulfide b) flammable gases c) oxygen d) hazardous gases |
c) oxygen |
|
|
What is the laboratory process called where liquid is evaporated and the condensate is recollected?
a) filtration b) digestion c) reflux d) distillation |
d) distillation |
|
|
Which of the following materials forms a reverse meniscus?
a) water b) oil and grease c) mercury d) NaOH |
c) mercury |
|
|
You are looking at a bottle of dry reagent and you notice ACS on the label. What does this refer to?
a) the grade of the chemical b) the manufacturer of the chemical c) the concentration of the chemical d) the chemical is anhydrous |
a) the grade of the chemical |
|
|
Which of the following is true:
a) 100 absorbance = 0% transmittance b) 0 absorbance = 100% transmittance c) 0% transmittance = 0 absorbance d) 100 absorbance = 100% transmittance |
b) 0 absorbance = 100% transmittance |
|
|
Place the following in order from most accurate to least accurate: Graduated Cylinders, Pipets, Burets, and Volumetric Flasks
a) graduated cylinders, burets, pipets, volumetric flasks b) pipets, burets, graduated cylinders, volumetric flasks c) volumetric flasks, pipets, burets, graduated cylinders d) burets, pipets, volumetric flasks, graduated cylinders |
d) burets, pipets, volumetric flasks, graduated cylinders |
|
|
The work gravimetric literally means what?
a) the measurement of weight b) the measurement of gravity c) the measurement of balance d) the measurement of strength |
a) the measurement of weight |
|
|
How is glassware intended for phosphorous analysis rinsed?
a) hot soapy water b) hot dilute HCI c) DI water only d) solution of chlorine |
b) hot dilute HCI |
|
|
If a chemical is a hydrate, it should contain what?
a) filler b) other chemicals c) water d) standards |
c) water |
|
|
Generally speaking, a burette is rinsed out with what, prior to doing a titration?
a) titrant b) DI water c) dilution water d) reagent grade water |
a) titrant |
|
|
What is -40 C in Fahrenheit?
a) -114 b) 0 c) -40 d) 9.7 |
c) -40 |
|
|
Positive charged ions are called what?
a) proton b) electrons c) cations d) anions |
c) cations |
|
|
What is the incubation time for fecal coliform membrane filter dishes?
a) 24 hrs +/- 2 hrs b) 8 hrs +/- 2 hrs c) 48 hrs +/- 3 hrs d) 6 hrs |
a) 24 hrs +/- 2 hrs |
|
|
Fecal coliform must be incubated at what temperature?
a) 44.5 C +/- 0.5 C b) 44.5 C +/- 0.2 C c) 44.5 C +/- 2.0 C d) 44.5 C +/- 1.0 C |
b) 44.5 C +/- 0.2 C |
|
|
What is the gram molecular weight of KNO3?
a) 101 grams/mole b) 69 grams/mole c) 56 grams/mole d) 72 grams/mole |
a) 101 grams/mole |
|
|
What is the gram-equivalent weight of KNO3?
a) 50.5 grams/mole b) 101 grams/mole c) 112 grams/mole d) 202 grams/mole |
b) 101 grams/mole |
|
|
You have a 1000 mg/l phosphate standard. You need 350 mLs of a 5 mg/L phosphate standard. How many milliliters of the original standard will this require?
a) 14.3 mLs b) 1750 mLs c) 1.75 mLs d) 350 mLs |
c) 1.75 mLs |
|
|
What is the media in the membrane filter method for fecal coliform?
a) Tryptic soy broth b) m-FC broth c) m-EC broth d) Lauryl Tryptose broth |
b) m-FC broth |
|
|
How many moles are in 172 grams of KNO3?
a) 0.587 moles b) 172 moles c) 1.7 moles d) 3.4 moles |
c) 1.7 moles |
|
|
How many grams of Ca(OH)2 are required to make 1.25 liters of 0.75M Ca(OH)2?
a) 74 grams b) 69 grams c) 123 grams d) 1.25 grams |
b) 69 grams |
|
|
The electrons found in the outer shell of an atom are referred to as what?
a) orbit b) valence c) shell d) anions |
b) valence |
|
|
T or F Spiked samples provide information on the accuracy of a method |
True |
|
|
T or F The purpose of a safety program is to eliminate all hazards in the laboratory |
False |
|
|
T or F A common method for preserving samples for the biochemical oxygen demand analysis is acidification to pH<2 with concentrated sulfuric acid |
False |
|
|
T or F In preparing dilutions of concentrated acids or bases, the analyst adds the concentrated reagent to water |
True |
|
|
T or F Samples to be analyzed for turbidity can be held a maximum of 3 days at 4 C before analysis |
False |
|
|
T or F Conductivity is a temperature-sensitive analysis |
True |
|
|
T or F A composite sample is prepared with samples from different locations collected reasonably simultaneously |
False |
|
|
T or F The imhoff cone is used to determine the settleable solids in a sample |
True |
|
|
T or F The range of bacterial colonies on a "countable" agar plate for the fecal coliform test is between 20 and 60 |
True |
|
|
T or F Sodium thiosulfate is added to sample bottles for bacteriological analysis for disinfection purposes |
False |
|
|
T or F When using the cadmium reduction method to determine nitrate concentration, nitrite must be measured separately and subtracted from the value obtained from the reduction procedure |
True |
|
|
T or F Samples for all forms of phosphorous should be acidified immediately to a pH of less than two |
False |
|
|
T or F A sample to be analyzed for nitrites should be preserved by acidifying and cooling to 6 C |
False |
|
|
T or F A nitrification inhibited BOD will measure only the carbonaceous demand |
True |
|
|
T or F The culture media used in the fecal coliform MPN procedure is m-FC media |
False |
|
|
T or F Pretreatment before performing a BOD test includes nitrification inhibition by the addition of sodium azide to the sample |
False |
|
|
T or F It is necessary to dechlorinate before determining the DO in a Sample |
False |
|
|
T or F Oven incubators are more accurate than water baths |
False |
|
|
Biochemical oxygen demand is the:
a) same as oxygen consuming capacity b) amount of carbonaceous organic matter present c) oxygen required during the stabilization of decomposable organic matter by aerobic bacterial action d) ratio of available dissolved oxygen to the oxygen consumed e) ratio of the oxygen consumed to the available dissolved oxygen |
c. oxygen required during the stabilization of decomposable organic matter by aerobic bacterial action |
|
|
The standard incubation period for a BOD test is:
a) one day b) three days c) five days d) seven days e) nine days |
c) five days |
|
|
A "buffer" is a substance:
a) added to a medium to change its pH b) added to a sample of a medium to facilitate the determination of pH c) which tends to resist changes in pH when acid or alkali is added d) added to culture media after titration to prevent pH fluctuation |
c) which tends to resist changes in pH when acid or alkali is added |
|
|
A solution with a pH of 6 is changed to pH of 4. Its acidity is now:
a) twice as great b) 1/2 times as great c) 1/100 times as great d) 100 times as great |
d) 100 times as great |
|
|
When a sample is tested repeatedly under controlled condition, the precision of the test is directly related to:
a) relative error b) accuracy c) confidence limits d) median value e) reproducibility |
e) reproducibility |
|
|
What organisms will be found in a balanced, good settling mixed liqour?
a) Flagellates and amoeboid organisms b) Flagellates and free-swimming ciliates, but no stalked ciliates and rotifers c) free-swimming and stalked ciliates, some flagellates, and rotifers d) nematodes, rotifers, ciliates, flagellates, and amoeboid |
c) free-swimming and stalked ciliates, some flagellates, and rotifers |
|
|
Three diseases potentially carried by wastewater are:
a) mumps, measles, colds b) scarlet fever, pneumonia, hay fever c) typhoid fever, dysentery, cholera d) tuberculosis, diphtheria, chickenpox |
c) typhoid fever, dysentery, cholera |
|
|
What should be an operators top priority when making operational decisions?
a) protecting aquatic life b) cleanup procedures c) protecting the public health d) preventing odors |
c) protecting the public health |
|
|
Given the following data, calculate the average velocity in the channel: 2.5 ft wide channel flow depth is 1.4 ft flow rate is 7.2 MGD
a) 1.2 ft/sec b) 3.2 ft/sec c) 11.2 ft/sec d) 32.2 ft/sec |
b) 3.2 ft/sec |
|
|
Immediate first aid for burns is to:
a) bandage tightly b) apply warm, moist compress c) immerse in warm water d) flood with cold water |
d) flood with cold water |
|
|
If chlorine costs $.21/lb, what is the daily cost to chlorinate 5 MGD of wstewater to an initial concentration of 2.6 mg/L?
a) $1.95 b) $3.25 c) $10.84 d) $22.77 |
d) $22.77 |
|
|
A horizontal centrifugal pump has "rope" packing. When the pump is operating, water slowly drips from the packing gland. This indicate that the:
a) packing bolts or nuts on the packing gland should be tightened b) packing bolts or nuts on the packing gland should be loosened c) packing bolts or nuts on the packing gland are properly adjusted d) packing should be replaced |
c) packing bolts or nuts on the packing gland are properly adjusted |
|
|
Under ice and snow cover, the BOD level in ponds will normally:
a) decrease rapidly b) decrease slowly c) increase slowly d) remain the same |
c) increase slowly |
|
|
An incubator for the BOD test should be controlled at:
a) 15 C b) 20 C c) 25 C d) 30 C |
b) 20 C |
|
|
Turbidity in wastewater is caused by:
a) color b) dissolved calcium c) hardness d) finely divided suspended material |
d) finely divided suspended material |
|
|
Disaster planning is:
a) having manuals ready so they can be read if a disaster occurs b) something that, if properly done, will not need to be revised c) useful in reducing confusion in the event of a disaster d) only necessary if your facility is located near a coast or fault line |
c) useful in reducing confusion in the event of a disaster |
|
|
Before repairing a pumps electrical circuit, which of the following actions should you take?
a) disconnect the circuit breaker, place a red tag and lock it out b) post a notice in the break room c) tell all the operators not to activate the circuit d) turn the pump switch to standby |
a) disconnect the circuit breaker, place a red tag and lock it out |
|
|
Which of the following causes the greatest pipe friction loss?
a) decreasing the rate of flow b) increasing the temp of wastewater c) increasing the velocity of wastewater d) decreasing the pressure |
c) increasing the velocity of wastewater |
|
|
Which of the following devices is used to measure the flow of wastewater?
a) comminutor b) comparator c) parshall flume d) sluice gate |
c) parshall flume |
|
|
Activated sludge generally _____ than raw sludge.
a) settles more slowly b) is more granular c) is saltier d) is denser |
a) settles more slowly |
|
|
The weight of a chemical compound is 1/8 of the total weight of a chemical solution. The percent, by weight, of the chemical in solution is:
a) 6.4% b) 8.3% c) 10.5% d) 12.5% |
d) 12.5% |
|
|
Assuming a constant suction head, the discharge of a centrifugal pump:
a) decreases with an increase in discharge head b) increases with the head increase only at the start of pumping c) increases with the increase of discharge head d) is independent of the discharge head |
a) decreases with an increase in discharge head |
|
|
Which of the following forms of plant life is necessary for the proper functioning of a stabilization or oxidation pond?
a) algae b) cattails c) water lilies d) weeds |
a) algae |
|
|
Controlling the sludge wasting rate by constant MLSS concentration involves maintaining a certain concentration of:
a) suspended solids in the reactors b) volatile suspended solids in the reactors c) volatile suspended solids in the return sludge d) volatile suspended solids in the waste sludge |
b) volatile suspended solids in the reactors |
|
|
A single piston reciprocating pump has a 6 in diameter piston with a 6 in length stroke. If it makes 16 discharge strokes per minute, the pumping rate is:
a) 6 gpm b) 12 gpm c) 25 gpm d) 47 gpm |
b) 12 gpm |
|
|
The ash content remaining at the end of a VSS test is the same as the :
a) difference in raw sludge and the sludge after air drying b) inorganic solids c) organic solids d) volatile solids |
b) inorganic solids |
|
|
Calculate the weir loading for a primary settling tank that has an outlet weir that is 480 ft long and receives a flow of 5 MGD.
a) 9220 gpd/ft b) 9600 gpd/ft c) 9920 gpd/ft d) 10420 gpd/ft |
d) 10420 gpd/ft |
|
|
The span of supervision is the:
a) average length of time required to be in the organization before becoming a supervisor b) number of levels between the employee with the least amount of responsibility and the employee with the most responsibility c) number of subordinates for each manager d) number of supervisors in an organization |
c) number of subordinates for each manager |
|
|
Chlorine residual may be determined using the reagent:
a) DPD b) EDTA c) PCB d) Na2S2O3 |
a) DPD |
|
|
When high organic waste load reaches an activated sludge plant, the operators first indicator is the decrease in:
a) COD in plant influent b) DO residual in the aeration tanks c) floatables int he primary clarifiers d) flow to the treatment plant |
b) DO residual in the aeration tanks |
|
|
The highest concentration of algae growth in a facultative lagoon is usually observed:
a) near mid depth b) near the bottom c) near the top d) in the sludge layer |
c) near the top |
|
|
Chlorine is primarily used to:
a) disinfect b) prevent corrosion c) raise pH d) stabilize organics |
a) disinfect |
|
|
One method that generally is helpful in encouraging an employee to derive satisfaction from work is giving the employee a(n):
a) change in position whenever a need for self expression is indicated b) opportunity to demonstrate efficiency in various types of work c) realization that job security depends on manifest interest in the job d) understanding of the relationship of the job to the work of the whole organization |
d) understanding of the relationship of the job to the work of the whole organization |
|
|
When organic wastes are discharged to receiving water, oxygen is depleted by:
a) algae during the day b) bacteria c) pathogens d) limestone rocks |
b) bacteria |
|
|
Which gas is produced in anaerobic digesters and can be used as a fuel?
a) propane b) methane c) ethane d) carbon dioxide |
b) methane |
|
|
Your systems billing is based on water usage rate. Given the following data, calculate the bill to be received by a customer that uses 35000 gal/quarter. Data: $1 /1000 gal for the first 10000 gal $ .75 /1000 gal for the next 15000 gal $ .50 /100 gal for more than 25000 gal
a) $21.75 b) $26.25 c) $34.50 d) $40.75 |
b) $26.25 |
|
|
Decentralized authority describes the process of:
a) Changing an organization from centralized to decentralized b) delegating authority to ones supervisors instead of one's subordinates c) delegating power for decisions to lower levels d) retracting authority that has been previously delegated and probably changing functions and duties |
c) delegating power for decisions to lower levels |
|
|
A rotating biological contactor treats a flow of 2.2 MGD with a BOD of 110 mg/L. The surface area of the media is 550000 sq ft. What is the organic loading?
a) 2.7 lbs BOD/1000 sq ft b) 3 lbs BOD/1000 sq ft c) 3.5 lbs BOD/1000 sq ft d) 3.7 lbs BOD/1000 sq ft |
d) 3.7 lbs BOD/1000 sq ft |
|
|
Of the following, which is most likely the cause of electric motor failure:
a) dust b) new connection c) no friction d) moisture |
d) moisture |
|
|
Chemical coagulation doses can be initially estimated by:
a) jar tests b) measurements of zeta potential c) oxidation reduction investigations d) stoichiometric calculations |
a) jar tests |
|
|
A pump runs continuously for 24 hours at full speed and delivers 288000 gal. The capacity of the pump is _____ g/min.
a) 100 gpm b) 200 gpm c) 1000 gpm d) 12000 gpm |
b) 200 gpm |
|
|
Which of the following organisms should not be present in a healthy lagoon treatment system:
a) aerobic bacteria b) anaerobic bacteria c) algae d) fungi |
d) fungi |
|
|
Common hydraulic detention times for primary clarifiers range from:
a) 15 to 30 min b) .5 to 1 hour c) 2 to 3 hours d) 4 to 5 hours |
c) 2 to 3 hours |
|
|
Which of the following would not be considered good laboratory practice for the disposal of chemical wastes:
a) Burning flammable solvents in large metal containers at a safe distance away from the building b) distillation and recovery of used solvents for reuse c) evaporation of non-combustible solvents if vapors are not an environment hazard d) neutralization of acidic and basic material before disposal e) dilution of soluble, nontoxic materials into the sewer system if they will not harm the plumbing or environment |
a) burning flammable solvents in large metal containers at a safe distance away from the building |
|
|
The Winkler method is used for determining which one of the following conditions in water samples?
a) amount of dissolved oxygen b) count of bacterial colonies c) effect of sterilization of samples of inoculated media d) degree of filtration e) presence of free ammonia |
a) amount of dissolved oxygen |
|
|
The Kjieldahl method is a method of determining:
a) pH concentration b) nitrogen c) chlorine d) dissolved oxygen e) hydrogen sulfide |
b) nitrogen |
|
|
When measuring and delivering liquids with a volumetric pipette calibrated for T.D., the liquid remaining in the tip?
a) will eventually drain out b) should be blown out c) is not removed after draining the pipette d) would not accumulate if the pipette were used properly |
c) is not removed after draining the pipette |
|
|
A 100 mL sample of solution was evaporated to dryness in a dish that weighed 62.1292 grams. The dish plus solids weighed 62.1771 grams after drying and cooling. What was the total solids content in mg/L?
a) 0.479 b) 4.79 c) 47.9 d) .0479 |
d) .0479 |
|
|
Which of the following can most affect pH measurement:
a) turbidity b) colloidal suspensions c) oxidants d) temperature |
d) temperature |
|
|
The primary purpose of chlorinating a secondary effluent is:
a) to oxidize any remaining organic matter b) to control odors at the treatment plant c) to disinfect the effluent d) to control hydrogen sulfide generation at the plant e) to precipitate out heavy metals with the organic matter |
c) to disinfect the effluent |
|
|
The purpose of primary sedimentation is to remove:
a) pathogenic bacteria b) dead insects c) roots, rags, cans, and large debris d) settleable and floatable materials e suspended and dissolved solids |
d) settleable and floatable amterials |
|
|
Conductivity for water samples is commonly run to:
a) determine the amount of ionic reagent needed in precipitation and neutralization reactions b) evaluate variations in dissolved mineral concentration c) estimate sample size for use in chemical determinations d) all of the above e) "a" and "b" |
b) evaluate variations in dissolved mineral concentration |
|
|
A solution is made by mixing 127 g of ethyl alcohol in enough water to make 1.35 liters of solution. What is the molarity of the solution? One mole of ethyl alcohol weighs 46.07 g.
a) 0.00204 M b) 2.04 mM c) 2.04 M d) 0.094 M |
c) 2.04 M |
|
|
An analyst filters 50 mL of raw domestic wastewater through a tared glass fiber filter, dries the filter at 103-105 degrees C and weighs it again. Given the following weights, what is the total suspended solids of the sample in mg/L?
a) 254 mg/L b) 0.254 mg/L c) 127 mg/L d) 130 mg/L |
a) 254 mg/L |
|
|
Which one of the following measurements is a check for systematic error?
a) accuracy b) precision c) blanks d) duplication |
a) accuracy |
|
|
Fixed solids are those solids which:
a) pass through a glass fiber filter b) are lost upon ignition at 550 +/- 50 C c) remain fixed on a glass fiber filter d) remain after ignition at 550 +/- 50 C e) cannot be dislodged from sides of sample container |
d) remain after ignition at 550 +/- 50 C |
|
|
The most oxidized form of nitrogen which may be found in waters and wastewater is:
a) organic nitrogen b) nitrate c) nitrogen gas d) nitrite |
b) nitrate |
|
|
A method may be precise but not accurate. Which of the following factors may lead to a precise but inaccurate measurement:
a) low instrument sensitivity b) poorly standardized solutions c) instrument noise d) variable rate of biological activity |
b) poorly standardized solutions |
|
|
A treatment plant removes 41% of the suspended solids in the primary clarifiers. If the primary effluent suspended solids are 112 mg/L, the primary influent suspended solids are:
a) 190 mg/L b) 270 mg/L c) 46 mg/L d) 66 mg/L |
a) 190 mg/L |
|
|
Given the following, find the total solids for the sample: Dish tare weight = 1.38 g Dish and wet sample weight = 32.4 g Dish and dry sample weight = 1.86 g Sample volume = 100 mls
a) 4800 mg/L b) 310200 mg/L c) 4.8 mg/L d) 18600 mg/L |
a) 4800 mg/L |
|
|
Total Kjeldahl nitrogen is defined as the toal sum of:
a) nitrates and nitrites b) nitrates and ammonia c) organic nitrogen and ammonia d) organic nitrogen and nitrates e) none of the above |
c) organic nitrogen and ammonia |
|
|
If the anticipated BOD (unseeded) of a wastewater sample is 120 mg/L, the sample volume giving nearest to 50% oxygen depletion in a 300 mL bottle is: (initial DO = 8)
a) 1 mL b) 3 mL c) 5 mL d) 10 mL e) 15 mL |
d) 10 mL |
|
|
Precision but not accuracy can be evaluated for:
a) alkalinity b) total solids c) fecal coliform d) mercury e) COD |
c) fecal coliform |
|
|
What is the hold time for a turbidity sample:
a) 28 days b) 48 hours c) 6 hours d) 14 days |
b) 48 hours |
|
|
Where should one look first to find an approved method for measuring phosphate levels for an NPDES permit?
a) Standard Methods b) USEPA Methods for Chemical Analyses of Water and Wastes c) 40 CFR 136 d) 40 CFR 141 |
c) 40 CFR 136 |
|
|
Settleable solids are measured in what units?
a) mg/L b) ppm c) ppb d) ml/L |
d) ml/L |
|
|
Volatile solids are a characterization (or rough measurement) of what kind of material?
a) inorganic material b) synthetic material c) organic material d) combustible material |
c) organic material |
|
|
What is not one of the benefits of COD over BOD?
a) the test can be performed in less than three hours b) the reagents can easily be disposed of c) the COD results in 95%-100% oxidation of all organic compounds in the test d) the COD test is not at the mercy of biological factors |
b) the reagents can easily be disposed of |
|
|
Carbonaceous BOD is what?
a) the BOD exhibited by nitrogen containing materials in the effluent b) the BOD exhibited by non-nitrogen containing materials in the effluent c) the BOD exhibited by the oxidation of nitrogen in the sample d) the BOD exhibited by the reduction of nitrogen in the sample |
b) the BOD exhibited by non-nitrogen containing materials in the effluent |
|
|
The settleable solids separated from liquids during processing and the deposits of foreign materials on the bottoms of streams or other bodies of water are called what?
a) settleable solids b) suspended solids c) sludge d) media |
c) sludge |
|
|
Anions are attracted to which electrode in an electrically charged solutions?
a) anode b) cathode c) cation d) negatively charged electrode |
a) anode |
|
|
Which of the following is most toxic to biological treatment plant organisms?
a) iron b) aluminum c) chromium d) calcium |
c) chromium |
|
|
Which of the following is most toxic to biological treatment plant organisms:
a) Iron b) Aluminum c) Chromium d) Calcium |
c) Chromium |
|
|
Which of the following would be likely to have the highest ammonia nitrogen concentration: a) river water b) fresh raw sewage c) standard rate trickling filter effluent d) extended aeration process effluent |
b) fresh raw sewage |
|
|
Nitrogen and phosphorus are biologically significant in wastewater because:
a) the nitrogen is reduced to pure nitrogen gas when phosphorus is present as a catalyst, and this leads to nitrogen supersaturation and rapid fish kills b) nitrogen in the form of nitrites is toxic to the organisms responsible for aerobic decomposition c) nitrogen and phosphorus are essential nutrients that can enable aquatic d) nitrogen and phosphorus oxidize in water to nitric and phosphoric acids leading to depression of the pH and intolerable kiving conditions for the aquatic organisms present |
c) nitrogen and phosphorus are essential nutrients that can enable aquatic plant growth to become troublesome |
|
|
The term "DO sag curve" as normally used refers to:
a) the depletion in DO that occurs in the BOD test b) the depletion in DO through wastewater treatment plant c) the depletion in DO that occurs in a stream receiving organic wastes d) none of the above |
c) the depletion in DO that occurs in a stream receiving organic wastes |
|
|
Eutrophication of lakes or reservoirs may best be described as:
a) serious pollution by wastewater of industrial waste b) enrichment leading to the production of aquatic life c) septic conditions leading to the destruction of all aquatic life d) none of the above |
b) enrichment leading to the production of aquatic life |
|
|
Detritus is a common name for:
a) grease b) skimmings c) feces d) heavy coarse material carried by wastewater |
d) heavy coarse material carried by wastewater |
|
|
Trickling filters are:
a) easily upset by shock loads but not affected by temperature changes b) easily upset by shock loads and affected by temperature changes c) not easlity upset by shock loads or affected by temperature changes d) not easlity upset by shock loads but are affected by temperature changes |
d) not easily upset by shock loads but are affected by temperature changes |
|
|
If air is supplied at a uniform rate throughout the length of an aeration tank, the DO at the inlet end of the tank will probable be:
a) More than at the end of the tank b) Less than at the end of the tank c) The same as at the end of the tank d) More or less, depending on the flow |
b) Less than at the end of the tank |
|
|
Since reaction rates are lower, the operator of an activated sludge plant during the winter will usually maintain:
a) lower MLSS b) lower sludge ages c) higher MLSS d) higher food to micro-organism ratios |
c) higher MLSS |
|
|
Overall long-term success or failure in operating an activated sludge plant depends largely upon proper control of the:
a) DO in the aeration tank b) mass of active organisms in the plant c) return sludge cycle d) pH in the aeration tank |
b) mass of active organisms in the plant |
|
|
The reason for concentrating sludge before anaerobic digestion is to:
a) reduce pumping b) increase detention time c) reduce heat requirements d) all of the above |
d) all of the above |
|
|
As a digester approaches a "sour" condition:
a) alkalinity of the sludge decreases b) concentration of volatile acids increases c) amount of methane production decreases d) all of the above |
d) all of the above |
|
|
The earliest indication to biological upset in anaerobic digesters would usually be:
a) a significant decrease in pH b) an increase in volatile acids and alkalinity c) an increase in the volatile acids to alkalinity ratio d) a significant decrease in the carbon dioxide gas production |
c) an increase in the volatile acids to alkalinity ratio |
|
|
Bubbles are noted throughout the chlorine contact tank. The most probable cause is:
a) decomposition of sludge deposits b) excess chlorine gas escaping c) supersaturation DO escaping d) none of the above |
a) decomposition of sludge deposits |
|
|
Float and electrode switches should be checked at least once a week to see that:
a) the floats are not submerged b) controls respond to changing water levels as expected c) motor speed increase gradually d) the switches change the direction of flow |
b) controls respond to changing water levels as expected |
|
|
The process whereby oxidation of organic matter in sewage occurs in aerated tanks containing recycled aerobic organisms is:
a) pre-aeration b) filtration c) sludge digestion process d) activated sludge process |
d) activated sludge process |
|
|
The biological oxidation of sewage solids on beds of stone is called:
a) sedimentation b) trickling filter process c) spray irrigation d) activated sludge process |
b) trickling filter process |
|
|
Settleable and floating organic solids are removed in:
a) preliminary treatment b) primary treatment c) secondary treatment d) tertiary treatment |
b) primary treatment |
|
|
In wastewater the solids that are subject to decomposition are:
a) domestic b) inorganic c) organic d) dissolved |
c) organic |
|
|
Successful trickling filter operation depends on:
a) maintenance of chlorine residual in the effluent b) having the largest stones available for the media c) maintenance of clean grounds d) maintaining a good growth of organisms on the filter media |
d) maintaining a good growth of organisms on the filter media |
|
|
The Parshall flume is used in measuring flows in:
a) force mains b) catch basins c) open channels d) sewers
|
c) open channels |
|
|
The V-notch weir is particularly suited for:
a) measuring extremely high flows b) measuring sludge levels c) measuring very low flows d) controlling flows |
c) measuring very low flows |
|
|
If the flow in the sewer is much less than two feet per second:
a) it will develop a hydraulic jump b) it will develop a hydraulic radius c) solids will settle out and obstruct the sewer d) a scouring action will develop |
c) solids will settle out and obstruct the sewer |
|
|
The reason for setting a minimum detention time in a chlorine contact tank is:
a) to allow the effluent to settle b) to provide proper chlorine residual c) to assure sterilization of sewage d) to provide sufficient time for disinfection |
d) to provide sufficient time for disinfection |
|
|
As a channel type grit chamber fills with grit, the velocity of the sewage:
a) increases and the efficiency of the grit removal decreases b) decreases and the efficiency of the grit removal increases c) decreases and the efficiency of the grit removal is not affected d) remains the same |
a) increases and the efficiency of the grit removal decreases |
|
|
Piping at sewage treatment plants is sometimes painted different colors to:
a) help identify the individual lines b) help the operator avoid hitting his head on low pipes c) improve the appearance of the plant d) prevent corrosion |
a) help identify the individual lines |
|
|
A final effluent sample collected for BOD or suspended solids determinations should be collected:
a) as it flows over the weir or from the weir trough b) after is has mixed with the receiving stream c) from the sludge return line d) from the bottom of the final tank |
a) as it flows over the weir or from the weir trough |
|
|
BOD reduction through a secondary treatment plant should normally be in the range of:
a) 50-65% b) 65-75% c) 85-95% d) 95-100% |
c) 85-95% |
|
|
In the operation and maintenance of a centrifugal pump in a wastewater treatment plant:
a) the packing should be well lubricated b) over greasing of bearings should be avoided c) the packing box should be allowed to leak slightly d) all of the above |
d) all of the above |
|
|
Filamentous bulking of activated sludge may be controlled by:
a) spraying the aeration tank with a fine spray of water b) adding sodium chloride to the aeration tank c) carefully chlorinating the return sludge d) aerating the final settling tank |
c) carefully chlorinating the return sludge |
|
|
For the best operation in the mesophilic range, the temperature of an anaerobic sludge should be held constant between:
a) 55-65 F b) 65-75 F c) 85-95 F d) 105-115 F |
c) 85-95 F |
|
|
The difference between the amount of chlorine added to sewage and the amount remaining after a specified time is defined as:
a) chlorine break point b) chlorine residual c) chlorine demand d) chlorine concentration |
c) chlorine demand |
|
|
The most important purpose of chlorination in a sewage treatment plant is for the:
a) destruction of filter flies b) control of odors c) prevention of siltation d) disinfection of the effluent |
d) disinfection of the effluent |
|
|
The gas most commonly associated with odors in septic sewage is:
a) carbon dioxide b) methane c) hydrogen sulfide d) carbon monoxide |
c) hydrogen sulfide |
|
|
The liquid that separates from the solids during sludge digestion is called:
a) supernatant b) centrate c) filtrate d) effluent |
a) supernatant |
|
|
What test is used to measure strength of sewage?
a) pH b) pressure test c) biochemical oxygen demand d) ortho-tolidine test |
c) biochemical oxygen demand |
|
|
The velocity in a grit chamber should be maintained at about:
a) 1.0 feet per second b) 2.0 feet per second c) 10 feet per second d) 20 feet per second |
1.0 feet per second |
|
|
The resistance to flow in pumping water or wastewater results in pressure usually referred to as:
a) horsepower b) hydraulic radius c) dynamic head d) static head |
c) dynamic head |
|
|
Oxygen deficiency in manholes, sewers, wet wells and other confined areas:
a) is usually fatal when the oxygen level is less than 13 percent b) is a leading cause of death in the water pollution control field c) should be tested before entering d) all of the above |
d) all of the above |
|
|
The optimum pH range for anaerobic sludge digestion is:
a) 3.8-4.4 b) 4.8-5.4 c) 5.8-6.4 d) 6.8-7.4 |
d) 6.8-7.4 |
|
|
A particular electric motor is wound for 3 phase current. if one phase cuts out while it is in operation:
a) the motor will continue to run without damage and will do a normal amount of work b) the motor will continue to run without damage but the work done will be reduced one-third c) the motor will stop immediately d) the motor will heat and will be damaged unless it is stopped by a thermal control device |
d) the motor will heat and will be damaged unless it is stopped by a thermal control device |
|
|
A sewer pipe has a diameter of 18 inches. What is the cross-sectional area in feet square?
a) 1.5 feet square b) 1.76 feet square c) 2.54 feet square d) 1.02 feet square |
b) 1.76 feet square |
|
|
The volume of sludge in a sludge storage tank 14 feet in diameter and 20 feet deep is about:
a) 900 cubic feet b) 2000 cubic feet c) 3100 cubic feet d) 4200 cubic feet |
c) 3100 cubic feet |
|
|
If the sludge level in a digester 30 feet in diameter is lowered 1 foot, how many square feet of sludge bed area would be necessary to cover the bed to a depth of 12 inches?
a) 132 b) 157 c) 314 d) 707 |
d) 707 |
|
|
A pump at a pump station discharges 175 gallons per minute. Disregarding incoming flow, how many hours would it take to pump 25,000 gallons from the wet well?
a) 1.9 hours b) 19.1 hours c) 143 hours d) 2.4 hours |
d) 2.4 hours |
|
|
What is the pressure, in psi, on the bottom of a circular clarifier, if the depth of wastewater is 14 feet?
a) 14 psi b) 6 psi c) 12 psi d) not sufficient information |
b) 6 psi |
|
|
A motor pulling 4 amps at 220 volts uses:
a) 110 watts b) 880 watts c) 55 watts d) 220 watts |
b) 880 watts |
|
|
The cross sectional area of a 24 inch pipe is how many times as great as the cross sectional area of a 12 inch pipe?
a) 4 x b) 1.5 x c) 3 x d) 2 x |
a) 4 x |
|
|
We expect the following efficiencies of BOD removal from the various units: primary tanks, 30%; trickling filter, 50%; oxidation ditch (activated sludge), 85%. Based on this information, what will the effluent BOD concentration be expected if the influent BOD is 350 mg/L:
a) 22 mg/L b) 18 mg/L c) 30 mg/L d) 25 mg/L |
b) 18 mg/L |
|
|
When 15,000 gallons of 1% waste activated sludge are gravity thickened to 3.5%, the new volume will be:
a) 1245 gallons b) 4300 gallons c) 525 gallons d) 6000 gallons |
b) 4300 gallons |
|
|
Methane and what other gas is found in an anaerobic digester? |
Carbon Dioxide |
|
|
Sludge records are kept for how long? |
5 years |
|
|
If you have a chlorine tank leaking liquid, where do you position the leak?
a) bottom b) top c) sideways d) diagonally |
b) top |
|
|
Chlorine combines with ammonia to form what? |
Chloramines |
|
|
What is the federal agency that enforces the Clean Water Act?
a) EPD b) EPA c) ETA d) NPDES |
b) EPA |
|
|
What is the agency in Georgia that enforces the Clean Water Act?
a) EPD b) EPA c) ETA d) NPDES |
a) EPD |
|
|
What does NPDES stand for? |
National Pollutant Discharge Elimination System |
|
|
Monthly monitoring data should be reported to the EPD/EPA on what form?
a) DNA form 3320 b) NRA form 1040 c) VCR form BR549 d) DMR form 3320 |
d) DMR form 3320 |
|
|
The Georgia EPD has _____ to enforce the federal Clean Water Act:
a) Causality b) Carte Blanche c) Primacy d) Immunity |
c) Primacy |
|
|
The Code of Federal Regulations is updated daily in what publication?
a) The New York Times b) Standard Methods c) Federal Register d) OSHA |
c) Federal Register |
|
|
What are the target parameters for the EPA series 600 methods?
a) Wastewater organics b) Drinking water organics c) Inorganics d) Aggregate organic constituants |
a) Wastewater organics |
|
|
When must the monthly monitoring data be completed and postmarked?
a) 1st of the current month b) End of the current month c) 15th of the current month d) 15th of the following month |
d) 15th of the following month |
|
|
Where should one look for which methods are approved for NPDES monitoring?
a) CFR Title 40 Part 136 b) CFR Title 40 Part 140 c) DNR EPD chapter 391-3-6 d) CFR Title 29 |
a) CFR Title 40 Part 136 |
|
|
The wastewater treatment process designed to kill pathogenic bacteria is called what?
a) Digestion b) Chlorination c) Disinfection d) Discharge |
c) Disinfection |
|
|
What should the velocity of the sewage in a gravity sewer line be as it is coming into the wastewater plant?
a) greater than 5 fps b) less than 4 fps c) greater than 3 fps d) less than 2 fps |
d) less than 2 fps |
|
|
Primary clarification generally removes what percentage of TSS?
a) 60% b) 90% c) 30% d) 85% |
a) 60% |
|
|
Primary clarification generally removes what percentage of BOD?
a) 60% b) 90% c) 30% d) 85% |
c) 30% |
|
|
What is the predominant biological organism, responsible for stabilizing waste material?
a) Nocardia b) Bacteria c) Rotifer d) Filamentous |
b) Bacteria |
|
|
Where can you find the definition of a confined space?
a) CFR Title 40 Part 136 b) Supervisor c) Standard Methods d) OSHA 29 CFR 1910.146 |
d) OSHA 29 CFR 1910.146 |
|
|
What order must a confined space atmosphere be tested:
a) Toxic Gases, Combustible Gases, Oxygen b) Combustible Gases, Oxygen, Toxic Gases c) Oxygen, Toxic Gases, Combustible Gases d) Oxygen, Combustible Gases, Toxic Gases |
d) Oxygen, Combustible Gases, Toxic Gases |
|
|
What is not one of the 6 items required to be recorded for a flow composited sample?
a) Time b) Date c) Weather d) Volume e) Initials |
c) Weather |
|
|
What are the 5 items to be recorded for each sample analyzed? |
Date, Time, Name, Procedure, Result |
|
|
How long should sample records be maintained for plant samples?
a) 1 year b) 2 years c) 3 years d) 5 years |
c) 3 years |
|
|
How long should sample records be maintained for sludge samples?
a) 1 year b) 2 years c) 3 years d) 5 years |
d) 5 years |
|
|
You are required to monitor your influent and effluent samples for BOD three times weekly. You actually test for it everyday. How many results do you report to the state?
a) All of them b) The 3 best c) Average the 5 together d) The first 3 |
a) All of them |
|
|
What substance is added to fecal coliform sample if the sample contains chlorine?
a) Sulfuric Acid b) Sodium Thiosulfate c) Sodium Chloride b) Sodium Bisulfate |
b) Sodium Thiosulfate |
|
|
What is the hold time for a chlorine residual sample?
a) 48 hours b) 1 hour c) 28 days d) 15 minutes |
d) 15 minutes |
|
|
What is the most common sample preservation temperature?
a) 0 C b) 32 F c) 6 C d) 42 F |
c) 6 C - and - d) 42 F |
|
|
How is a BOD sample preserved?
a) Sulfuric Acid b) Sodium Thiosulfate c) 6 C d) Formaldehyde |
c) 6 C |
|
|
Where are the best locations in any treatment stream to collect samples?
a) Where there is good mixing action of the location b) Where there is the most representative location c) Where it is deemed safe per OSHA 29 CFR 1910.146 d) Where it is likely the best test result possible |
a) Where there is good mixing action of the location - and - b) Where there is the most representative location - and - c) Where it is deemed safe per OSHA 29 CFR 1910.146 |
|
|
What is the most accurate volumetric glassware?
a) Volumetric pipette b) Graduated cylinder c) Measuring pipette d) Buret |
d) Buret |
|
|
What is 10 C in Fahrenheit?
a) 32 F b) 40 F c) 50 F d) 56 F |
c) 50 F |
|
|
What is 180 C in Fahrenheit?
a) 356 F b) 1012 F c) 212 F d) 350 F |
a) 356 F |
|
|
What is 30 F in Celsius?
a) 0 C b) 1 C c) 10 C d) 11 C |
b) 1 C |
|
|
What is 250 F in Celsius?
a) 350 C b) 200 C c) 171 C d) 121 C |
d) 121 C |
|
|
How many grams of NaOH are needed to prepare 500mLs of a 5.2 M solution of NaOH?
a) 208 g b) 104 g c) 52 g d) 32 g |
b) 104 g |
|
|
If you dissolve 54 grams of NaCl in 1 liter of water, what is the molar concentration of the NaCl solution?
a) 93 moles/l b) .93 moles/l c) 9.3 moles/l d) 58 moles/l |
b) .93 moles/l |
|
|
What is the gram equivalent weight of the HCl?
a) 35 g b) 1 g c) 42 g d) 36 g |
d) 36 g |
|
|
What is the gram equivalent weight of NaOH?
a) 23 g b) 39 g c) 40 g d) 2.3 g |
c) 40 g |
|
|
How many grams of NaOH are required to prepare 500 mL of 0.1N NaOH solution?
a) 2 g b) 20 g c) .2 g d) 200 g |
a) 2 g |
|
|
What material forms a reverse meniscus?
a) Hydrochloric Acid b) Mercury c) Polymer d) Water |
b) Mercury |
|
|
Removing heavy materials from water samples by evaporating and recondensing the sample is called what?
a) Evaporation b) Distillation c) Desiccation d) Filtration |
b) Distillation |
|
|
Removing materials from samples by passing it through some type of filter material is called?
a) Evaporation b) Distillation c) Desiccation d) Filtration |
d) Filtration |
|
|
Cooling a sample in the absence of moisture is called?
a) Evaporation b) Distillation c) Desiccation d) Filtration |
c) Desiccation |
|
|
On a colorimeter, if the absorbance is 0.000, the % transmittance would be?
a) 0% b) 100% c) 0.000% d) BTL |
b) 100% |
|
|
What is the most widely used grade of chemicals in the laboratory?
a) ACS b) Mid grade c) ASTM d) Kindergarten |
a) ACS - and - b) Mid grade |
|
|
What are the three types of thermometers? |
Total Immersion, Partial Immersion, Complete Immersion |
|
|
What filter size is used for Membrane Filter Method to determine Fecal Coliform?
a) 45 um b) 4.5 mm c) .45 um d) 45 mm |
c) .45 um
|
|
|
What is used to inhibit the growth of non-fecal coliform bacteria during the Membrane Filter Method?
a) Rosolic Acid b) Sodium Thiosulfate c) Sodium Chloride d) Formula 409 |
a) Rosolic Acid
|
|
|
What is the geometric mean for the following data set: 5,21,9,2,7 ?
a) 38.48 b) 6.67 c) 8.8 d) 4.09 |
b) 6.67
|
|
|
What is the geometric mean for the following data set: 120,54,78,91,102,84,56 ?
a) 40.9 b) 83.57 c) 530.77 d) 80.58 |
d) 80.58
|
|
|
Fecal coliforms are used in the wastewater treatment industry as an indicator organism. Describe what an indicator organism is?
|
An organism easily traceable by lab testing yet inextricably linked to target bacteria.
|
|
|
Total coliforms can be divided into two groups of bacteria, non-fecal coliform and fecal coliform. What divides the two groups?
a) Temperature - 44.5 C +/- .2 C b) Time - 24 hrs +/- 2 hrs c) Temperature - 45.5 C +/- .2 C d) Time - 48 hrs +/- 2 hrs |
a) Temperature - 44.5 C +/- .2 C
|
|
|
The CFR recommends that samples be analyzed for fecal coliform within how many hours of collections?
a) 2 hours b) 4 hours c) 6 hours d) 24 hours |
c) 6 hours
|
|
|
What are the two approved techniques for the analysis of fecal coliforms in wastewater?
a) Geometric Mean, Mixed Dilution b) Presumptive Phase, Confirmed Phase c) Membrane Dilution, Bacterial Detection d) Membrane Filtration, Multi-tube Fermentation |
d) Membrane Filtration, Multi-tube Fermentation
|
|
|
What are the three phases of testing in the MPN technique?
a) Presumptive b) Incubated c) Confirmed d) Completed |
a) Presumptive
c) Confirmed d) Completed |
|
|
What should be done with the waste materials (analyzed samples, discarded plates, etc.) prior to disposal?
a) Deleted b) Use Formula 410 because Formula 409 just isn't enough c) Autoclave d) Keep at 6 C +/- 2 C for 30 days |
c ) Autoclave
|
|
|
You dose your effluent with chlorine at 10 mg/L. At the end of the contact basin, you collect a sample and test for chlorine. Your result is 2 mg/L. What is the chlorine demand?
a) 5 mg/L b) 8 mg/L c) 2 mg/L d) 10 mg/L |
b) 8 mg/L
|
|
|
What material is added to the stock solution of Sodium Thiosulfate in order to preserve it?
a) Chloroform b) Sodium Biosulfate c) Potassium Permangenate d) Potassium Iodide |
a) Chloroform
|
|
|
What material is added to the total chlorine powder pillows for the Hach DPD method otherwise making them identical?
a) Potassium Permangenate b) Potassium Sulfide c) Potassium 409 d) Potassium Iodide |
d) Potassium Iodide
|
|
|
In the DPD method, the colorimeter must be checked periodically against a standard made from what material?
a) Chlorine b) Potassium Sulfide c) Potassium Permangenate d) Potassium Iodide |
a) Chlorine
- and/or - c) Potassium Permangenate |
|
|
What scientific law is used to determine chlorine, using a colorimeter?
a) Busch's Law b) Beer's Law c) Miller's Law d) Heineken's Law |
b) Beer's Law
|
|
|
Definition of Total Suspended Solids?
|
The portion of total solids retained by a glass fiber filter that remain after drying at 103-105 C.
|
|
|
At what temperature are Total Dissolved Solids samples dried?
a) 44.5 C +/- 2 C b) 180 C +/- 2 C c) 100 C +/- 2 C d) 20 C +/- 2 C |
b) 180 C +/- 2 C
|
