coagulation and flocculation

Question 1 

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

cause damage to the municipal works
interfere with coagulation and flocculation
kill bacteria used in wastewater treatment
a and c but not b
all of the above

Question 2

Historically, the use of chlorine bleach has made the pulp and paper industry an important source of __________ contamination.

dioxin
chromium
polychlorinated biphenyls (PCBs)

Question 3

Chlorination of drinking water is highly effective at killing __________.

bacteria
protozoa
viruses

 

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