Question

A sewage treatment plant involves few steps in its working.
Aeration tank, grit and sand removal tank, second sedimentation tank, bar screen, first sedimentation tank.
(a) Arrange all the above steps in the correct order in which they occur in the sewage treatment plant.
(b) Which step gives most of the sludge? [HOTS]

Answer 1

Answer:

Sewage treatment is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater. Physical, chemical, and biological processes are used to remove contaminants and produce treated wastewater (or treated effluent) that is safe enough for release into the environment. A by-product of sewage treatment is a semi-solid waste or slurry, called sewage sludge. The sludge has to undergo further treatment before being suitable for disposal or application to land.