Civil Engineering > GATE 2021 SET-1 > Environmental Engineering
Which one of the following is correct?
A
The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being discharged into a flowing river at a point P. If the rate of degradation of the organics is higher than the rate of aeration, then dissolved oxygen of the river water will be lowest at point P.
B
The most important type of species involved in the degradation of organic matter in the case of activated sludge process based wastewater treatment is chemoheterotrophs.
C
For an effluent sample of a sewage treatment plant, the ratio BOD5-day, 20 °C upon ultimate BOD is more than 1.
D
A young lake characterized by low nutrient content and low plant productivity is called eutrophic lake.

Correct : b

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Related Topics

civil engineering gate GATE 2021 Set-1 wastewater treatment activated sludge process BOD ratio eutrophic lake definition young lake characteristics nutrient content plants productivity sewage treatment plant chemical degradation aquatic ecosystem organic matter decomposition

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