In the first stage anaerobic tank, the phosphorus sludge flowing into the original sewage and returning from the secondary sedimentation tank at the same time, the main function of this tank is to release phosphorus, so that the concentration of P in the sewage increases, and the dissolved organic matter is absorbed by the microbial cells, so that the concentration of BOD in the sewage decreases; in addition, NH3-N is removed because of the combination of cells, so that the concentration of NH3-N in the sewage decreases, but the content of NO3-N does not change.<br>
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