Question

Question A6 (5 marks) Sewage treatment plants alter between aerobic and anaerobic conditions to facilitate the biological removal of nitrogen and phosphorus. Describe why this is so (with the aid of either chemical reaction equations or a diagram) for phosphorus

Answer 1

In anaerobic zone, the biological phosphorus removal (BPR) is done by a group of microbes named PAOs (polyphosphate accumulating organisms). These microbes are capable of accumulating more phosphorus than non-PAOs organisms. Using the polyphosphate, PAOs are able to uptake fermentation products (acetate, VFAs) under anaerobic condition.

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