Question

Which of the following is the primary objective of the activated sludge process in wastewater treatment?

• A.
• B.
• C.
• D.

Hint:

The activated sludge process primarily removes suspended solids and reduces BOD through biological treatment with microorganisms.

Answer 1

The Correct Option is A

Activated Sludge Process:
The activated sludge process is a biological wastewater treatment method primarily aimed at treating and removing suspended solids and organic materials from wastewater using microorganisms.

Objective of the Process:
While the activated sludge process does reduce the BOD (Biochemical Oxygen Demand) of wastewater, its primary function is the removal of suspended solids. During the aeration phase, microorganisms consume organic matter, and the solids either get converted into biomass or are removed by sedimentation in a secondary clarifier.

Clarifying the Options:
(A) is correct because the primary goal of the activated sludge process is the removal of suspended solids, which is achieved through biological oxidation and settling.
(B) While reducing BOD is an important outcome, it's a secondary effect of removing suspended solids.
(C) and (D) are not objectives of the activated sludge process, as it does not specifically aim to increase pH or neutralize acidic components.

Conclusion:
Therefore, the correct answer is (A) To remove suspended solids from wastewater.