The activated sludge process (ASP) for sewage treatment is classified as:
Choose the correct answer
Anaerobic attached growth
Aerobic suspended-growth process in aeration tank followed by secondary sedimentation
Purely physical process
Trickling filter process
Correct Answer
B. Aerobic suspended-growth process in aeration tank followed by secondary sedimentation
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
ASP is an aerobic, suspended-growth biological process. Sewage + return activated sludge (RAS) enter aeration tank; air is blown in; microorganisms oxidise organics (BOD removal 85–95%); mixed liquor goes to secondary clarifier; settled sludge is partly returned (RAS) and partly wasted (WAS). MLSS = 2000–3000 mg/L typically.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.