Oxidation ponds (waste stabilisation ponds) primarily rely on:
Choose the correct answer
Mechanical aeration only
Algae-bacteria symbiosis: algae produce O2 by photosynthesis; bacteria oxidise BOD using that O2
Chlorination of sewage
Pressure filtration
Correct Answer
B. Algae-bacteria symbiosis: algae produce O2 by photosynthesis; bacteria oxidise BOD using that O2
Why is this the answer?
Oxidation ponds / WSP: shallow ponds (0.5–1.5 m deep) where algae produce O2 through photosynthesis; bacteria use this O2 to oxidise organics (symbiosis). Solar energy drives the process. Long HRT (5–30 days). Series: anaerobic pond (deep, 2–5 m) → facultative pond → aerobic polishing pond. Suitable for warm sunny climates — common in India.
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