Coliform bacteria in water is an indication of the presence of
radioactive wastes
excess fertilizer
decaying animals and plants
human feces
Correct answer is D
No explanation has been provided for this answer.
Both temporary and permanent hardness of water can be removed by
boiling
distillation
filtration
decantation
Correct answer is B
No explanation has been provided for this answer.
The methods used for biological treatment are
lagoon
activated sludge process
oxidation ditches
all of these
Correct answer is D
No explanation has been provided for this answer.
When temporary hard water is boiled, one of the substances formed is
calcium bicarbonate
calcium sulfate
hydrogen chloride
carbon dioxide
Correct answer is D
No explanation has been provided for this answer.
The activated sludge process is sometimes referred as
fluid bed biological oxidation system
fixed bed biological oxidation system
turning bed biological oxidation system
none of the above
Correct answer is A
No explanation has been provided for this answer.
The activated sludge process consists of returning a portion of the clarifier
effluent water entering the reactor
influent water coming out of the reactor
influent water entering the reactor
effluent water coming out of the reactor
Correct answer is C
No explanation has been provided for this answer.
The purest form of naturally occurring water is
rain water
river water
pond water
well water
Correct answer is A
No explanation has been provided for this answer.
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