Removal of Biological Nitrogen / Phosphorus by the change of influent nitrogen concentration

摘要

The inflow sewage treatment process of the present invention is for removing nitrogen and phosphorus in sewage, and is characterized by effectively removing nitrogen and phosphorus according to the distribution ratio of inflow water. The nitrogen and phosphorus removal processes are performed by appropriately distributing the influent water to the anaerobic tank and the anoxic tank according to the ratio of the organic substance (BOD) and the nitrogen (N) in the influent water to the organic substance (BOD) and the nitrogen (N) When the ratio (BOD / N) is about 4, the influent water is entirely introduced into the anoxic tank. When the ratio is 25, it is preferable that the influent water is entirely introduced into the anaerobic tank. When the ratio of the organic substance (BOD) to the nitrogen (N) in the influent water has an intermediate value thereof, it is preferable that the influent water is dividedly introduced based on r = 1 + (4-BOD / N) / 21 Do.