Question

Sewage treatment process in which part of decomposer microbes is recycled into the starting process is

• A. primary treatment
• B. activated sludge treatment
• C. catalytic treatment
• D. tertiary treatment

Answer 1

The correct option is B activated sludge treatment

Activated sludge treatment is a sewage-treatment process in which sludge, the accumulated, bacteria deposits of settling tanks and basins, is seeded into incoming wastewater and the mixture agitated for several hours in the presence of ample air supply.

So, the correct option is 'Activated sludge treatment'.