The trickling filter process for sewage treatment is classified as:
Choose the correct answer
Aerobic suspended growth (like activated sludge)
Aerobic attached-growth (fixed-film) process — biofilm on filter media oxidises sewage organics
Anaerobic digestion
Physical sedimentation only
Correct Answer
B. Aerobic attached-growth (fixed-film) process — biofilm on filter media oxidises sewage organics
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Trickling filter: aerobic, attached-growth (fixed film) biological process. Sewage is sprinkled over a bed of media (rocks, plastic); biofilm attached to media oxidises organics. No aeration equipment; ventilation by natural convection. BOD removal: 80–85%. Simpler to operate than activated sludge. Humus (biofilm) settles in secondary clarifier.
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