Collections 1

Front 1

The greatest activity and the highest BOD(biochemical oxygen demand) removal in a facultative lagoon will occur when there is:

Back 1

Good sunlight

Warm temperatures

Moderate breeze

Front 2

What two actions take place on a drying bed?

Back 2

Evaporation & Filtration

Front 3

When organic wastes are discharged to receiving waters, oxygen is depleted by:

Back 3

Bacteria

Front 4

Artificial respiration must be started on a non-breathing casualty within:

Back 4

4 minutes

Front 5

Dangerous gases most likely encountered in the wastewater industry are:

Back 5

Carbon monoxide, methane, hydrogen sulfide

Front 6

What pH reading indicates an acidic wastewater?

Back 6

3. 0-6:Acidic 7: Neutral. 8-14: Basic alkaline

Front 7

Which of the following is not a method of biological treatment?

Back 7

Primary settling

Front 8

Before free chlorine can exist as a residual:

Back 8

Micro organism kill must be complete

Front 9

The correct reason for upstream chlorination of a sewer is:

Back 9

Oxidizes H2S, Reduces odors, Reduces bacteria

Front 10

At what time of the day is the DO(dissolved oxygen) content highest in a facultative lagoon?

Back 10

3 PM

Front 11

Weir overflow rate in settling tanks is expressed in what units?

Back 11

gpd/ lineal ft

Front 12

What is the main purpose for adding oxygen to an aeration tank?

Back 12

Keeps bacteria alive

Front 13

Domestic wastewater consist of:

Back 13

Industrial & Domestic

Front 14

What is reduced in the digester?

Back 14

Total & Volatile solids

Front 15

An example of aerobic treatment is:

Back 15

A trickling filter

Front 16

Chlorine residual is:

Back 16

Dosage minus demand

Front 17

Centrifugal pump parts include:

Back 17

An impeller

Front 18

________ indicates a good quality domestic activated sludge?

Back 18

Brown color & musty odor

Front 19

What is the difference between the chlorine demand and the chlorine used?

Back 19

Residual

Front 20

What happens when sludge bulking occurs?

Back 20

More suspended solids will flow over the weir

Front 21

Sludge volume index indicates:

Back 21

ml occupied by 1 gm of sludge

Front 22

The highest concentration of algae growth in a facultative lagoon is usually:

Back 22

Near the top

Front 23

What test measures the strength of wastewater?

Back 23

BOD(biochemical oxygen demand)

Front 24

In a centrifugal pump, internal leakage is prevented by:

Back 24

Wear rings

Front 25

The normal BOD(biochemical oxygen demand) removal efficiency of an activated sludge plant is:

Back 25

90% to 98%

Front 26

A water seal on a pump serves a dual purpose. It acts as a lubricant and:

Back 26

Acts as a coolant to keep the pump bearing from overheating

Front 27

What is the purpose of a bubbler control system?

Back 27

To indicate the level in the tank

Front 28

What is happening if you have a good collection system and your plant has an increase in the amount of grit removed?

Back 28

Broken sewer pipes in the collection system

Front 29

_____ is the form of plant life that is necessary for the proper functioning of a stabilization or oxidation pond?

Back 29

Algae

Front 30

Adding chemicals and slowly mixing over a long period of time to distribute the chemicals is:

Back 30

Flocculation