How is Chemical Oxygen Demand (COD) calculated?

Civil Engineering : Waste Water Engineering - Quiz(MCQ)

Waste water is oxidised chemically using sodium in acid solutions

Waste water is oxidised chemically using bromine in acid solutions

Waste water is oxidised chemically using dichromate in acid solutions

Waste water is oxidised chemically using strontium in acid solutions

Correct Answer : Waste water is oxidised chemically using dichromate in acid solutions

Explanation : Waste water is oxidised chemically using dichromate in acid solutions. High COD value indicates that the presence of inorganic compounds is high. Inorganic compounds get chemically oxidised and this results in the increase of organic compounds in the sample.

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.