Biochemical Engineering - Water Treatment

Exercise :: Water Treatment - Section 1

  • Water Treatment - Section 1
26. 

Permanent hardness of water may be removed by the addition of

A. lime
B. soda ash
C. potassium permagnate
D. sodium bicarbonate

Answer: Option B

Explanation:

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27. 

Both temporary and permanent hardness of water can be removed on boiling water with

A. calcium hydroxide
B. sodium carbonate
C. calcium oxide
D. calcium carbonate

Answer: Option B

Explanation:

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28. 

Lagoons may be characterized as

A. anaerobic
B. facultative
C. aerated
D. all of these

Answer: Option D

Explanation:

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29. 

Temporary hardness of water may be removed by adding

A. calcium hydroxide
B. calcium carbonate
C. calcium chloride
D. sodium bicarbonate

Answer: Option A

Explanation:

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30. 

The maximum desirable limit (BIS of mercury in the drinking water is

A. 0.05 mg/l
B. 0.9 mg/l
C. 0.1 mg/l
D. 0.001 mg/l

Answer: Option D

Explanation:

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