Most human exposure to polychlorinated biphenyls (PCBs) in the environment

/in /by

Question 1

  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

  1. A septic system consists of a septic tank and a __________.
[removed] leach field
[removed] sludge digester
[removed] trickling filter

1 points  

Question 3

  1. Secondary sewage treatment is fundamentally a _______________ process.
[removed] biological
[removed] chemical
[removed] mechanical
[removed]  

1 points  

Question 4

  1. 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

  1. 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

  1. Primary sewage treatment is fundamentally a _______________ process.
[removed] biological
[removed] chemical
[removed] mechanical

1 points  

Question 7

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  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

  1. Secondary sewage treatment is fundamentally a _______________ process.
[removed] biological
[removed] chemical
[removed] mechanical

Question 9

  1. 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

  1. 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

  1. 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

  1. 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