SNDPR synchronous nitrification denitrification occurs in the aerobic tank due to the low dissolved oxygen DO (0.5 ± 0.2mg/L), resulting in a difference in dissolved oxygen concentration within the sludge. Nitrification can occur in an aerobic environment on the sludge surface, while denitrification can occur in an anoxic environment inside the sludge. At the same time, free phosphorus is absorbed into polyphosphate accumulating bacteria.
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