both the water flushed down toilets and other household wastewater

Question 1

A combined sewer overflow is designed to handle __________.

[removed]

both the water flushed down toilets and other household wastewater

[removed]

the overflow of pretreated industrial wastes

[removed]

peaks in wastewater flow caused by surface runoff

1 points

Question 2

A septic system consists of a septic tank and a __________.

[removed]

leach field

[removed]

sludge digester

[removed]

trickling filter

1 points

Question 3

Secondary sewage treatment is fundamentally a _______________ process.

[removed]

biological

[removed]

chemical

[removed]

mechanical

[removed]

1 points

Question 4

About __________ of treated sewage sludge in the United States is disposed of by spreading it on land.

[removed]

25 percent

[removed]

50 percent

[removed]

75 percent

1 points

Question 5

Potable water is water that is __________.

[removed]

available for human use within a given watershed

[removed]

considered suitable for use as drinking water

[removed]

derived from a sustainable source

1 points

Question 6

Primary sewage treatment is fundamentally a _______________ process.

[removed]

biological

[removed]

chemical

[removed]

mechanical

1 points

Question 7

Metals present in municipal wastewater may still be present in treated sewage sludge; __________.

[removed]

dioxins may also be present in treated sludge, but pathogens will not be present

[removed]

pathogens may also be present in treated sludge, but dioxins will not be present

[removed]

both pathogens and dioxins may also be present in treated sludge

1 points

Question 8

Currently, most human exposure to polychlorinated biphenyls (PCBs) in the environment is through _______________.

[removed]

ingestion of food

[removed]

inhalation of indoor air

[removed]

intravenous drips

1 points

Question 9

The most significant difference between untreated and treated sewage sludge is that most of the __________ have been removed from the treated sludge.

[removed]

metals

[removed]

organic chemicals

[removed]

pathogens

1 points

Question 10

The term biosolids is sometimes used to refer to __________.

[removed]

manure collected from CAFOs

[removed]

scum (floating material) inside a septic tank

[removed]

treated municipal sewage sludge

1 points

Question 11

The bar screen, grinder, and grit chamber are used in __________.

[removed]

municipal drinking water treatment

[removed]

municipal solid waste disposal

[removed]

primary sewage treatment

1 points

Question 12

Some likely human health impacts of polybrominated diphenyl ethers (PBDEs) are suggested by their chemical structure, which is similar to that of _______________.

[removed]

human growth hormone

[removed]

neurotransmitters

[removed]

thyroid hormones

1 points

Question 13

Exposure to byproducts of disinfecting drinking water with chlorine has been associated with increased risk of __________.

[removed]

bladder cancer

[removed]

leukemia

[removed]

oral cancer

1 points

Question 14

21. Chlorination of drinking water is highly effective at killing __________.

[removed]

bacteria

[removed]

protozoa

[removed]

viruses

[removed]

all of the above

1 points

Question 15

Which of the following are steps in primary sewage treatment?

[removed]

Bar screen, grinder, grit chamber, primary clarifier

[removed]

Settling, coagulation and flocculation, sedimentation, filtration

[removed]

Thickening and stabilization

Question 1

Trihalomethanes are __________.

[removed]

byproducts of drinking water disinfection

[removed]

common as indoor air contaminants from consumer products

[removed]

primarily a problem of medical wastes

Question 3

Secondary sewage treatment is fundamentally a _______________ process.

[removed]

biological

[removed]

chemical

[removed]

mechanical

Question 9

Historically, the use of chlorine bleach has made the pulp and paper industry an important source of __________ contamination.

[removed]

chromium

[removed]

dioxin

[removed]

polychlorinated biphenyls (PCBs)

Question 10

Which of the following are steps in municipal drinking water treatment?

[removed]

Bar screen, grinder, grit chamber, sedimentation tank

[removed]

Settling, coagulation and flocculation, sedimentation, filtration

[removed]

Thickening, stabilization, fluoridation

Question 12

Which of the following chemicals are widely used as flame retardants in consumer products?

[removed]

[removed]

Polybrominated diphenyl ethers (PBDEs)

[removed]

Polychlorinated biphenyls (PCBs)

Question 15

Industrial wastes, if not pretreated before entering a municipal wastewater treatment system, may __________.

[removed]

cause damage to the municipal works

[removed]

kill bacteria used in wastewater treatment

[removed]

both a and b

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