T/F

Question 1

Temperature, Altitude, and TDS all affect the amount of DO that can dissolve in water

Answer 1

True

Question 2

White, thick billowing foam common during the start-up of an activated sludge plant is caused by a low F/M ratio.

Answer 2

False, thin not thick.

Start ups have a high F/M

Question 3

NPDES stands for National Pollution Discharge Elimination System.

Answer 3

False, P stands for Pollutant

Question 4

CO2 and Ferrous Sulfide are toxic gases with offensive odors and are frequently found in confined spaces.

Answer 4

False

Question 5

BOD is typically twice as large as the COD concentration in a given sample.

Answer 5

False, COD is 2x than the BOD

Question 6

Nitrification involves the utilization of nitrate ions by facultative bacteria and the release of nitrogen gas.

Answer 6

False, It’s denitrification

Question 7

Sodium Thiosulfate is often used to destroy residual CL2 in a SE sample for DO

Answer 7

False, used only in coliform samples

Question 8

MSDS are only maintained for chemicals that are either purchased or stocked in quantities of 100 lbs (10 gallons, if liquid) or more.

Answer 8

False

Question 9

Higher surface loading rates will generally result in a lower percent removal of BOD and TSS

Answer 9

True, An increase in HLR/SOR means an increase in velocity

Question 10

An abundance of filaments in the activated sludge mixed liquor is generally an indicator of bulking.

Answer 10

True, higher filaments = higher SVI

Question 11

Using the F/M ratio to control the activated sludge process implies that an increase in the mass of microorganisms will be needed to treat an increased BOD or COD load

Answer 11

True

Question 12

When starting an anaerobic digester with a small amount of seed and a typical load of raw sludge, the operator should see a drop in a pH of the DS

Answer 12

True

Question 13

If the vacuum is lost in a CL2 system, the flow is automatically shut off

Answer 13

True

Question 14

Sodium nitrate has been added to treatment ponds for the purpose of odor control because it will oxidize odor causing substances.

Answer 14

False, Like Ca(NO3)2 bioxide, it prevents the formation of sulfides

Question 15

Advanced primary treatment involves the addition of ferric chloride or other coagulants to improve the removal of finely divided solids.

Answer 15

True

Question 16

Step feed aeration involves the adjustments in the rates of aeration along the length of the aeration tank.

Answer 16

False, it distributes the BOD load down the length of the aeration basin

Question 17

Typical organic loading for high rate trickling filters is between 25-100 gpd/sqft

Answer 17

False, OL is in lbs of BOD/ d*1000ft3 of media

Question 18

Volatile Solids reduction in a well operating anaerobic digester should be 50% or greater.

Answer 18

True

Question 19

Demand charge on a WWTP’s bill is measured in units of kilowatt-hours

Answer 19

False, $/Kilowatt

Question 20

A progressive cavity pump is generally classified as a positive displacement pump.

Answer 20

True

Question 21

N gas and CO2 are odorless, colorless, and non-flammable but could cause asphyxiation at concentrations much greater than normal.

Answer 21

True

Question 22

High I/I could contribute to poor performance of both primary and secondary processes.

Answer 22

True

Question 23

Careful application of chlorine to the flow being applied to a trickling filter may be used to correct certain operational problems,

Answer 23

True

Question 24

Most nitrogen in raw domestic sewage is either in the form of organic compounds such as proteins or as nitrate salts.

Answer 24

False

Question 25

Mud valves are built into many treatment plant basins that extend below ground level in order to prevent damage from hydrostatic pressure

Answer 25

True