How much amount of phosphorus is removed by secondary treatment?

Civil Engineering : Waste Water Engineering - Quiz(MCQ)

0.5-1 mg/l

0.2-0.3 mg/l

0.4-0.6 mg/l

1-2 mg/l

Correct Answer : 1-2 mg/l

Explanation : Normally secondary treatment can only remove 1-2 mg/l, so a large excess of phosphorous is discharged in the final effluent, causing eutrophication in surface waters.

Recently Updated in Waste Water Engineering Questions

What is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of the water quality called?

Algae growth

Eutrophication

Denitrification

Nitrification

Correct Answer : Option (B) : Eutrophication

Explanation : Eutrophication is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of water quality. The untreated wastewater is rich in organic matter which demands oxygen.