Exercise: Water Treatment

Questions for: Water Treatment

Coliform bacteria in water is an indication of the presence of
A:
radioactive wastes
B:
excess fertilizer
C:
decaying animals and plants
D:
human feces
Answer: D
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Both temporary and permanent hardness of water can be removed by
A:
boiling
B:
distillation
C:
filtration
D:
decantation
Answer: B
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The methods used for biological treatment are
A:
lagoon
B:
activated sludge process
C:
oxidation ditches
D:
all of these
Answer: D
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Zeolite softening process removes both temporary and permanent hardness of 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
Answer: B
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When temporary hard water is boiled, one of the substances formed is
A:
calcium bicarbonate
B:
calcium sulfate
C:
hydrogen chloride
D:
carbon dioxide
Answer: D
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