Question

what is the role of microbes in sewage treatment​

Answer 1

Answer:

These microbes consume major part of the organic matter in the effluent as they grow. Due to this, BOD of the effluent is significantly reduced. ... Thus, use of microbes in sewage treatment helps to remove organic matter from waste water before it is discharged in water bodies like rivers.

Answer 2

Answer:

Anaerobic bacteria are used in wastewater treatment on a normal basis. The main role of these bacteria in sewage treatment is to reduce the volume of sludge and produce methane gas from it.