biochemical oxygen demand
basic oxygen demand
british oxygen depletion
biological oxygen depletion
Correct answer is A
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.
sodium carbonate
permanent hardness of water
potassium carbonate
none of these
Correct answer is B
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.