Water Treatment – Section 1

36. The activated sludge process is sometimes referred to as

A. fluid bed biological oxidation system
B. fixed-bed biological oxidation system
C. turning bed biological oxidation system
D. none of the above

Correct Answer: A. fluid bed biological oxidation system

37. BOD stands for

A. Biochemical oxygen demand
B. British oxygen demand
C. British oxygen depletion
D. Biological oxygen depletion

Correct Answer: A. Biochemical oxygen demand

38. When temporary hard water is boiled, one of the substances formed is

A. calcium bicarbonate
B. calcium sulfate
C. hydrogen chloride
D. carbon dioxide

Correct Answer: D. carbon dioxide

39. Zeolite softening process removes both temporary and permanent hardness of the water. In this process, the calcium and magnesium present in water are precipitated as

A. insoluble carbonates
B. insoluble zeolites
C. insoluble chlorides
D. insoluble sulfates

Correct Answer: B. insoluble zeolites

40. The methods used for biological treatment are

A. lagoon
B. activated sludge process
C. oxidation ditches
D. all of these

Correct Answer: D. all of these

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