The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
Correct answer: A. Aerobic
- A. Aerobic
- B. Saprophytic
- C. Anaerobic
- D. Parasitic
Explanation
Trickling filters expose sewage to air as it passes over a microbial film, so aerobic bacteria carry out most of the biological oxidation. Anaerobic activity may occur in oxygen-depleted regions but is not the principal process.
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