The PH value should be controlled at 7-9. If the influent PH is lower than 7, the influent must be strictly controlled not to be too large, and intermittent influent should be used to buffer the influence of the influent PH being too low. The nutrient ratio of T:N:P should be greater than 100:5: 1, and the amount of water should be appropriately increased at the initial stage of water inflow, and the dissolved oxygen in the effluent should be controlled at about 2, so there is no need for long-term anhydrous aeration. The water temperature in the biochemical pool is higher than 20 degrees, and above 25 degrees can speed up the culture time.