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Biochemical Engineering
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Water Treatment
Comments
Question
Inhibitors are used along with sanitizer to
Options
A. improve their action
B. to prevent corrosion
C. both (a) and (b)
D. none of these
Correct Answer
to prevent corrosion
Water Treatment problems
Search Results
1. The maximum desirable limit (BIS of mercury in the drinking water is
Options
A. 0.05 mg/l
B. 0.9 mg/l
C. 0.1 mg/l
D. 0.001 mg/l
Show Answer
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Discuss
Correct Answer: 0.001 mg/l
2. Lagoons may be characterized as
Options
A. anaerobic
B. facultative
C. aerated
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
3. Acid used mostly for removal of milk stone is
Options
A. phosphoric acid
B. nitric acid
C. gluconic acid
D. tartaric acid
Show Answer
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Discuss
Correct Answer: nitric acid
4. The maximum desirable limit (BIS) of total hardness (as CaCo
3
) in drinking water is
Options
A. 600 ppm
B. 300 ppm
C. 500 ppm
D. 1000 ppm
Show Answer
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Discuss
Correct Answer: 300 ppm
5. The purest form of naturally occurring water is
Options
A. rain water
B. river water
C. pond water
D. well water
Show Answer
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Discuss
Correct Answer: rain water
6. Application of quaternary ammonium compounds as sanitizing agents tends to
Options
A. favor gram positive bacteria
B. decrease gram positive bacteria
C. increase the percentage of gram(-)ve rods on utensils
D. none of the above
Show Answer
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Discuss
Correct Answer: increase the percentage of gram(-)ve rods on utensils
7. Both temporary and permanent hardness of water can be removed by
Options
A. boiling
B. distillation
C. filtration
D. decantation
Show Answer
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Discuss
Correct Answer: distillation
8. Permanent hardness of water may be removed by the addition of
Options
A. lime
B. soda ash
C. potassium permagnate
D. sodium bicarbonate
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Correct Answer: soda ash
9. The common methods used for disinfection in waste water treatment plants are
Options
A. chlorination
B. UV light
C. both (a) and (b)
D. Phenolic solvent
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Discuss
Correct Answer: both (a) and (b)
10. Coliform bacteria in water is an indication of the presence of
Options
A. radioactive wastes
B. excess fertilizer
C. decaying animals and plants
D. human feces
Show Answer
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Discuss
Correct Answer: human feces
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Fermentation Kinetics
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Fluid Flow
Immobilized Enzyme
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Water Treatment