Question

When does the rate of aerobic oxidation reduced in the sewage that is reduced to the water?

(a) When oxygen concentration falls below 1.5 mg/l

(b) When oxygen concentration falls below 2.5 mg/l

(c) When oxygen concentration falls below 3.5 mg/l

(d) When oxygen concentration falls below 4.5 mg/l

I have been asked this question during an online interview.

The query is from Marine Pollution topic in portion Environmental Pollution of Energy Management

Answer 1

Correct option is (a) When oxygen concentration falls below 1.5 mg/l

The best I can explain: When the oxygen concentration falls below 1.5 mg/l, the rate of aerobic oxidation is reduced and replaced by anaerobic bacteria that can oxidizes the organic molecules without the use of oxygen.