Various symptoms indicate excessive aeration, but the DO in the aerobic tank is below 1 mg/L, with only the end section reaching 3 mg/L
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There is sludge-containing foam on the surface of the aerobic tank, and large splashes occur in the aeration tank. The SV30 value is 21, the sludge concentration is 4300, and the water inflow rate is 23,000. Two biological tanks are used, each with a volume of 15,000 cubic meters. However, the DO level in the aerobic tank is relatively low, below 1; only at the outlet does it reach 3 mg/L. Additionally, the number of rotifers has decreased, and some nematodes have appeared. What’s going on?
Including photos is the most straightforward way; it’s best to explain the manufacturing process and water inlet conditions as well for easier assessment