Question

Sewage treatment in which a portion of decomposer bacteria present in waste is recycled into the beginning of the process is

• A. Cyclic treatment
• B. Activated sludge treatment
• C. Primary treatment
• D. Tertiary treatment

Answer 1

The correct option is B Activated sludge treatment

Activated sludge treatment is the step involved in the treatment of sewage water. The sewage is treated in a large aerated tank and bacteria. Once, the process of decomposition is over, the filtrate obtained is called the activated sludge because it contains a high number of bacteria. This is then recycled in the next slot of treatment when the polluted sewage is available for the treatment. The activated sludge speeds up the process of decomposition by acting as an inoculum in the aeration tank. Primary treatment is the removal of large solid particles from the sewage. Tertiary treatment involves chemical treatment of the sewage water.

Hence, the correct answer is 'Activated Sludge treatment'.