question_answer

Hari was concerned about the disposal of municipal waste into the local river of his city. He decided to take steps regarding the issue. He advised his locality head that they should setup sewage treatment plant to treat this waste water.

(i) What are floes formed during secondary treatment of sewage?

(ii) A small part of the activated sludge is pumped back into aeration tank during secondary treatment of sewage. Give reason.

(iii) What value are shown by Hari?

Answer:

(i) Floes are masses of bacteria associated with fungal filament to form mesh - like structures.

(ii) A small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum.

(iii) Hari is responsible, has scientific attitude and is concerned about the environment.