14. Secondary sewage treatent a. Fails to remove dissolved nutrients b. Removes

ID: 119506 • Letter: 1

Question

14. Secondary sewage treatent

a. Fails to remove dissolved nutrients

b. Removes dissolved nutrients by use of dentrifiying bacteria

c. Can often remove metals such as copper

d. Is less effective than primary treatment in curtailing hypoxia

15.Tertiary sewage treatment would involve

a. The removal of very fine particulate matter

b. Removal of dissolved nutrients

c. Removal of heavy metals

d. Removal of oxygen

16. The greenhouse effect of the earth's atmosphere

a. Is caused by industrial emissions only of methane

b. Is caused only by carbon dioxide that is derived from industrial emissions

c. Is caused by natural sources only of carbon dioxide and other natural gases such as methane

d. Is caused by carbon diozide and other gases from both natural and industrial sources

14. Secondary sewage treatment

- b. Removes dissolved nutrients by use of denitrifying bacteria.

In secondary treatment processes of wastewater, biological treatment such as use of bacteria are used to dissolve organic nutrients.

15. Tertiary sewage treatment would involve

- b. Removal of dissolved nutrients.

Dissolved nurtients are nitrogen and phosporous. They are removed by the BNR Process which expands as Biological Nutrient Removal.

16. The greenhouse effect of Earth's atmosphere

-d. Is caused by carbon dioxide and other gases both from natural and industrial sources.

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