What measures should be taken when microorganisms are damaged?
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What measures should be taken when the biological treatment tank is subjected to load shocks and the microorganisms are damaged during the biochemical treatment of wastewater?
Increase the sludge discharge volume appropriately, add nutrients, and add new sludge if necessary
During the operation of the biochemical tank, once the microorganisms are subjected to stress due to changes in water volume or concentration, the COD removal efficiency drops sharply; in severe cases, sludge detaches from the biological fillers, causing the effluent to become turbid. At this point, the water supply should be stopped immediately, and powdered activated carbon should be added to the biological treatment tank in order to reduce the sludge load. The dosage of powdered activated carbon is 10 kilograms per 100 m3 of the tank’s volume. Once the sedimentation properties of the sludge have improved, the rapid proliferation method for sludge acclimatization can be employed: domestic wastewater can be added to the biochemical tank, or waste alcohol or wet paste made from cooked dry flour can be used. The addition rate is 5–10 kilograms of dry flour per 100 cubic meters of the biochemical tank’s volume. Water is introduced after 2–3 days, with the amount of water added increasing day by day until the microorganisms return to normal activity.