Metals present in municipal wastewater may still be present in treated sewage sludge
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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