Dean Lampman
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Wastewater Wastewater Treatment Study Material Quiz on Class D Wastewater Sample Questions, created by Dean Lampman on 16/12/2017.

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Class D Wastewater Sample Questions

Question 1 of 36

1

What Is not run on raw influent wastewater?

Select one of the following:

  • CBOD

  • FECAL Coliform

  • Suspended Solids

  • pH

Explanation

Question 2 of 36

1

What disease is not considered to be conveyed or transmitted by untreated wastewater?

Select one of the following:

  • Amoebic Dysentery

  • Hepatitis

  • Malaria

  • Cholera

Explanation

Question 3 of 36

1

What effect will the addition of chlorine, acid, alum. carbon dioxide, or sulfuric acid have on the pH of wastewater?

Select one of the following:

  • Neutralize

  • Lower

  • Increase

  • Have no effect

Explanation

Question 4 of 36

1

Coliform bacteria are

Select one of the following:

  • Algae

  • Coagulant aids

  • Indicators

  • Sequestering agents

Explanation

Question 5 of 36

1

Which of these pH readings indicates an acidic wastewater?

Select one of the following:

  • 3

  • 7

  • 9

  • 12

Explanation

Question 6 of 36

1

Three waterborne diseases are

Select one of the following:

  • Mumps, measles, colds

  • Scarlet fever, pneumonia, hay fever

  • Typhoid fever, dysentery, cholera

  • TB, diptheria, chickenpox

Explanation

Question 7 of 36

1

Which one of the following conditions increase chlorine demand?

Select one of the following:

  • Alkalinity

  • Increase in organic matter

  • Increase in phosphate

  • pH increase

Explanation

Question 8 of 36

1

A chlorine leak can be detected by

Select one of the following:

  • An explosimeter

  • Checking the leak guage

  • Spraying water on suspected leaks

  • A white cloud in presence of ammonia fumes

Explanation

Question 9 of 36

1

Turbidity in wastewater is caused by

Select one of the following:

  • Finely divided suspended material

  • Dissolved calcium

  • Hardness

  • Color

Explanation

Question 10 of 36

1

Dark tan and shiny foam is produced when

Select one of the following:

  • F/M ratio is too low

  • Insufficient aeration tank capacity

  • Young Sludge

  • RAS rate inappropriate

Explanation

Question 11 of 36

1

The pH of wastewater

Select one of the following:

  • Always increases as acid concentrations increase

  • Always increases when wastewater becomes septic

  • is measured on a scale of 0 to 14

  • is measured on a scale of 0 to 100 mg/L

Explanation

Question 12 of 36

1

Which of the following conditions are likely to have been caused by biological activity that is prompted by long, sluggish flow in a flat grade sewer line?

Select one of the following:

  • Concrete and metal corrosion

  • Oxygen deficiency in manholes, sewers, and wet-wells

  • Toxic gas production

  • All of the answers

Explanation

Question 13 of 36

1

Sand, silt, and grit are composed of what kind of matter?

Select one of the following:

  • Colloidal

  • Inorganic

  • Organic

  • Volatile

Explanation

Question 14 of 36

1

Which of the following statements is NOT indicative of fresh wastewater?

Select one of the following:

  • Contains some dissolved oxygen from the water supply

  • is being decomposed by facultative bacteria

  • is blackish in color, with rotten egg odor

  • is turbid with solids in suspension

Explanation

Question 15 of 36

1

How much does a gallon of water weigh?

Select one of the following:

  • 9.34 lbs

  • 8.34 oz

  • 7.5 lbs

  • 8.34 lbs

Explanation

Question 16 of 36

1

Organic solids in wastewater are

Select one of the following:

  • Generally of vegetable and animal origin

  • Inert and not subject to decay

  • Mostly floatable solids

  • Always settleable solids

Explanation

Question 17 of 36

1

The purpose of primary sedimentation is to remove

Select one of the following:

  • Pathogenic bacteria

  • Roots, rags, cans, and large debris

  • Sand and gravel

  • Settable and floatable material

Explanation

Question 18 of 36

1

One cubic foot of water contains how many gallons?

Select one of the following:

  • 2.31 gallons

  • 7.48 gallons

  • 8.34 gallons

  • 10 gallons

Explanation

Question 19 of 36

1

The seepage of groundwater into sewer lines through cracks and open joints is called

Select one of the following:

  • Inflow

  • Infiltration

  • A blessing in disguise

  • Sanitary sewage

Explanation

Question 20 of 36

1

The direct flow of rainwater into a sewer line through ground level openings and breaks is

Select one of the following:

  • Inflow

  • Infiltration

  • Industrial sewage

  • Sanitary sewage

Explanation

Question 21 of 36

1

_______________ is the most common and prevalent odorous gas associated with domestic wastewater collection systems.

Select one of the following:

  • Chlorine

  • Hydrogen sulfide

  • Carbon dioxide

  • Methane

Explanation

Question 22 of 36

1

Which of the following factors could cause a demand for more DO (Increase in aeration rate) in an aeration tank?

Select one of the following:

  • Increase in food (BOD) in the aeration tank influent

  • Decrease in organic wastewater

  • Increase in influent DO

  • Increase in toxic substances

Explanation

Question 23 of 36

1

Chlorine is _____ times heavier than air

Select one of the following:

  • 1.5

  • 2.0

  • 2.5

  • 3.0

Explanation

Question 24 of 36

1

The liquid to gas expansion ration of chlorine is

Select one of the following:

  • 25 to 1

  • 250 to 1

  • 460 to 1

  • 500 to 1

Explanation

Question 25 of 36

1

Gaseous chlorine is a

Select one of the following:

  • Clear colorless gas

  • White fog-like gas

  • Greenish-yellow gas

  • Greyish-white gas

Explanation

Question 26 of 36

1

In an aerator, a white billowing foam indicates

Select one of the following:

  • The need to increase wasting

  • The need to increase the return activated sludge rate

  • The need to decrease wasting

  • The need to stop the return activated sludge

Explanation

Question 27 of 36

1

In the aerator, the dissolved oxygen should be maintained at what level?

Select one of the following:

  • 2.0 mg/L

  • 5.0 mg/L

  • 6.0 mg/L

  • 8.0 mg/L

Explanation

Question 28 of 36

1

A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all characteristic of

Select one of the following:

  • A bulking sludge

  • A young sludge

  • An old sludge

  • None of the answers

Explanation

Question 29 of 36

1

A Class D operator shall not be the lead/chief operator of more than ______ wastewater treatment plant(s) at any time.

Select one of the following:

  • 1

  • 2

  • 5

  • 10

Explanation

Question 30 of 36

1

Where chlorine is used for basic disinfection, a total chlorine residual of at least 0.5 mg/L shall be maintained after at least _____ minutes contact time at maximum daily flow.

Select one of the following:

  • 15

  • 30

  • 45

  • 60

Explanation

Question 31 of 36

1

The operator must report the FDEP any serious breakdown or malfunction within what time frame?

Select one of the following:

  • 24 hours

  • 48 hours

  • 12 hours

  • Immediately

Explanation

Question 32 of 36

1

The recommended storage temperature for preserving samples is

Select one of the following:

  • 21° C

  • 4° C

  • 60° F

  • 32° F

Explanation

Question 33 of 36

1

Employee hazards you might encounter around a treatment facility would be

Select one of the following:

  • Noxious or toxic gases

  • Physical injuries

  • Oxygen deficiency

  • All of the answers

Explanation

Question 34 of 36

1

Chlorine gas is

Select one of the following:

  • Colorless

  • Heavier than air

  • Nontoxic

  • Odorless

Explanation

Question 35 of 36

1

Chlorine is primarily used to

Select one of the following:

  • Disinfect

  • Prevent corrosion

  • Raise pH

  • Stabilize organics

Explanation

Question 36 of 36

1

The exhaust fan inlet in a chlorinator room and/or chlorine storage room should be taken from

Select one of the following:

  • Anywhere - the location is not important

  • At floor level

  • Close to the entrance

  • In the ceiling

Explanation

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