disinfection

disinfection

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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