(3) pay attention to pH and TP, try to ensure that the system is in a weakly alkaline environment, and if necessary, add an appropriate amount of Na2C03 to the system to supplement the alkalinity required for nitrification;
(4) if the TP concentration in the reactor is significantly lower than the normal level, appropriate phosphate dihydrogen bait or phosphate fertilizer should be added to the system to improve the flocculation effect and nitrification capacity of the sludge;
(5) increase the external reflux ratio, maintain relatively high sludge concentration in the biochemical unit, and improve the impact resistance capacity of the system;
(6) appropriately increase the DO concentration (2.5-4.0 mglL) to improve the nitrification effect;
(7) after this part of sludge enters the secondary sedimentation tank, reduce the external return flow and increase the discharge amount of the remaining sludge, and conduct harmless treatment for this part of sludge as soon as possible;
(8) if conditions permit, the sludge respiration index and nitrification rate can be measured respectively to assist in the determination of reasons for exceeding the standard;
(9) increase the frequency of sampling and analysis, and check the effect of emergency measures taken on the improvement of effluent water quality;otherwise, other methods or multiple methods should be replaced to shorten the recovery time of the treatment system.