Environmental Health: Local To Global

Question 1

A combined sewer overflow is designed to handle __________.

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both the water flushed down toilets and other household wastewater

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the overflow of pretreated industrial wastes

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peaks in wastewater flow caused by surface runoff

1 points
Question 2

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

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leach field

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sludge digester

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trickling filter

1 points
Question 3

Secondary sewage treatment is fundamentally a _______________ process.

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biological

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chemical

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mechanical

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1 points
Question 4

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

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25 percent

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50 percent

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75 percent

1 points
Question 5

Potable water is water that is __________.

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available for human use within a given watershed

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considered suitable for use as drinking water

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derived from a sustainable source

1 points
Question 6

Primary sewage treatment is fundamentally a _______________ process.

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biological

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chemical

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mechanical

1 points
Question 7

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

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

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

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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 _______________.

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ingestion of food

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inhalation of indoor air

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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.

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metals

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organic chemicals

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pathogens

1 points
Question 10

The term biosolids is sometimes used to refer to __________.

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manure collected from CAFOs

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scum (floating material) inside a septic tank

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treated municipal sewage sludge

1 points
Question 11

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

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municipal drinking water treatment

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municipal solid waste disposal

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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 _______________.

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human growth hormone

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neurotransmitters

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thyroid hormones

1 points
Question 13

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

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bladder cancer

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leukemia

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oral cancer

1 points
Question 14

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

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bacteria

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protozoa

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viruses

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all of the above

1 points
Question 15

Which of the following are steps in primary sewage treatment?

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Bar screen, grinder, grit chamber, primary clarifier

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Settling, coagulation and flocculation, sedimentation, filtration

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Thickening and stabilization