The sludge effluent is turbid, and the TP level is high; only polyaluminum chloride can keep it within acceptable limits. Are there any other alternatives?
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The water quality parameters are as follows: pH is 6.97 at the inlet and 6.26 at the outlet; water temperature is 10°C at the inlet and 17°C at the outlet. SS is 88 at the inlet and 3 at the outlet. COD is 63.0 at the inlet and 23.6 at the outlet. NH3-N is 9.33 at the inlet and 1.56 at the outlet. TN is 12.7 at the inlet and 8.15 at the outlet. TP is 1.28 at the inlet and 0.86 at the outlet. MLSS is 8.5*10-3, SVI is 39, and SV30 is 33. Aerobic conditions: pH 6.05
Try reducing the aeration volume (or intermittent aeration)