Some questions regarding the operation of slaughterhouse wastewater

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During a recent water quality test, the ammonia nitrogen level was around 20, while TP was 1-3. The process involves anoxic treatment followed by two stages of aerobic treatment. There are some issues with its current operation: sludge accumulates rapidly, with the SV level remaining around 70%, and sometimes even reaching 90%. However, the quality of the effluent is acceptable. During the sludge removal periods, the SV level has been kept at 70%, but there are many bubbles at the outlet of the aerobic stage; the situation was more stable when sludge removal didn’t take place. If I don’t drain it, the high SV level might affect the water output; if I do drain it, there are too many bubbles now. The environmental protection agency is coming for an environmental impact assessment inspection soon, so I want to stabilize things. Based on my experience with debugging, sludge removal leads to a shortage of those bacteria responsible for nitration, which results in an increase in bubbles. (Previously, another operator made a mistake by turning the sludge removal switch in the wrong direction; as a result, sludge was removed for 2 days, and during the process of restoring normal conditions, there were countless bubbles everywhere, covering the entire area.) . . It took a week of continuous arching to recover, and now, just a few days after recovery, the SV level is high again; after sludge was removed, the bubbles appeared once more in large numbers. . ) The bubbles are muddy in color, a blood-brown shade – is that because of rapid aging? Could you give me some advice on running it?