Question

Sewage water can be purified for recycling with the action of [CBSE PMT 1990]
A) Aquatic plants
B) Penicillin
C) Micro-organisms
D) Fishes

Answer 1

ANSWER
.........

Sewage water can be purified for recycling with the action of => PENICILLIN

Answer 2

Answer:  

Sewage water can be purified by the action of C) Micro-organisms.  

Explanation:  

Sewage contains a lot of impurities and complex organics substances that contaminate them. In order to purify this system initially the sewage system is filtered after agglomerating the solid sludge in the system.

After this the water is treated with aerobic organisms and then by anaerobic organisms that break down the complex organic substances that can be broken down into simpler substances.