True and False - 4

Question 1

Sludge bulking is caused by light sludge not settling properly

Answer 1

T

Question 2

A rise in temperature should be expected when air is compressed

Answer 2

T

Question 3

When an activated sludge plant is first started, you should expect to see aeration basin foaming

Answer 3

T

Question 4

A WAS or RAS flow rate change of 25% in one day will have little effect on the plant

Answer 4

F

Question 5

pH has little effect on the activated sludge plant

Answer 5

F

Question 6

Filamentous microorganisms can be reduced by increasing aeration basin dissolved oxygen concentration

Answer 6

F

Question 7

The return sludge rate and wasting rate are the same for pure oxygen and conventional activates sludge plants

Answer 7

F

Question 8

Facultative bacteria can use oxygen from sodium nitrate

Answer 8

T

Question 9

A longer MCRT is required for nitrification than conventional activated sludge treatment

Answer 9

T

Question 10

If solids settle to the jar bottom within an hour and then rise before two hours, the activated sludge plant is upset

Answer 10

T

Question 11

Do meters normally cannot be used to measure Do concentration accurately below 1 mg/L in the field

Answer 11

T

Question 12

Three feet in the maximum depth for wastewater treatment ponds

Answer 12

F

Question 13

Algae growth in a wastewater pond lowers DO and increases pH

Answer 13

F

Question 14

Chlorine can be withdrawn at any rate from a chlorine cylinder

Answer 14

F

Question 15

Chlorine withdrawal rates are lower than sulfur dioxide withdrawal rates for the same size cylinder

Answer 15

F

Question 16

Sodium hypochlorite use is considered less hazardous than chlorine gas however, its cost makes sodium hypochlorite unattractive

Answer 16

F

Question 17

You have added enough chlorine to wastewater if you have met the chlorine demand

Answer 17

F

Question 18

Be sure to properly label a leaking chlorine cylinder before shipping it

Answer 18

F

Question 19

Chlorine gas cylinders should be isolated before taking the chlorinator off line

Answer 19

T

Question 20

Dechlorination is often accomplished with sulfur compounds

Answer 20

T

Question 21

The pH test is preferred for anaerobic digester control over the acid/alkalinity relationship

Answer 21

F

Question 22

Anaerobic digesters may become stuck if the pH drops below 6.7 or increases above 7.5

Answer 22

T

Question 23

The volatile acid to alkalinity ratio is normally around 0.1 when the digester is not stuck

Answer 23

T

Question 24

When an anaerobic digester is going sour, the pH will drop before the volatile acid/alkalinity ratio

Answer 24

F

Question 25

Anaerobic digester methane gas is normally around 65% by volume

Answer 25

T