16. Oxidation ponds are shallow ponds, generally designed at the depth of

A. 2 to 40 feet
B. 4 to 6 feet
C. 1 to 3 feet
D. 5 to 8 feet

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17. Which of the following is generally not referred to the sewerage system?

A. Sanitary sewers
B. Storm sewers
C. Combined sewers
D. Solid sewers

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18. The magnitude of BOD of wastewater is related to

A. bacterial count
B. amount of organic material
C. amount of inorganic material
D. all of the above

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19. A dense bacterial population caught in a tangled web of fibers sticking to a surface describes

A. coagulation
B. a biodisc
C. a biofilm
D. the membrane filter technique

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20. Biogas production is

A. a temperature-dependent process
B. a temperature independent process
C. an oxygen dependent process
D. none of the above

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