Wastewater treatment generates a large quantity of sludge, which can be treated by:

Options

A. anaerobic digesters
B. floc
C. chemicals
D. oxidation pond

Answer

A

Explanation

The sediment of settling tank is called activated sludge. A part of it is used as inoculum in aeration tanks. The remaining is passed into a large tank called anaerobic sludge digesters.