household wastewater
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
[removed]
mechanical
[removed]
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
[removed]
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
[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.
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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
[removed]
Settling, coagulation and flocculation, sedimentation, filtration
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Thickening and stabilization
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