ObjectiveMcq
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What is the amount of phosphorus present in municipal waste water?
Correct Answer: C — 5-20 mg/L
Municipal waste waters may contain from 5 to 20 mg/l of total phosphorous, of which 1-5 mg/l is organic and the rest in inorganic. The individual contribution tends to increase because phosphorous is one of the main constituents of synthetic detergents.