Question

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

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

Answer 1

The correct option is A anaerobic digesters

• Wastewater treatment generates a large quantity of activated sludge during secondary treatment which is used as an inoculum and a small part of it is pumped back to the large aeration tanks whereas the remaining part of that sludge is treated by anaerobic sludge digesters anaerobically.
• During this digestion, bacteria produces a mixture of gases called biogas.

So, the correct option is 'Option A' .