The present invention relates to a method for removing phosphorus and particulate organic matter in a wastewater from a primary settling tank in which an inflow / wastewater is mixed with a chemical in a mixing tank and then transferred to a reaction tank and reacted with slow stirring, A second step of transferring the sedimentation sludge precipitated and removed in the first step to a thermochemical digestion tank, recovering and reusing the drug through thermal and chemical digestion, decomposing the particulate organic matter into a dissolved form and supplying it as an organic carbon source in the nitrogen removal process, And a third step of treating the effluent of the sedimentation tank treated in the first step in a nitrification tank and a denitrification tank to remove nitrogen, and to a biological and chemical treatment method and a wastewater treatment system.;The wastewater treatment method of the present invention is a process for advanced treatment of wastewater or wastewater. The wastewater treatment method of the present invention can be used for treatment of general wastewater with high concentration and low concentration by combining physico-chemical treatment method or physical / chemical treatment method and biological treatment method And it is an effective treatment method involving a thermochemical sludge digestion process in which sludge loss and chemicals can be recovered and reused for economical operation of the treatment plant. In other words, the treatment method of the present invention is a very economical and compact nitrogen / phosphorus simultaneous removal process and can be easily applied to existing standard activated sludge processes. In addition to elimination of nitrogen and phosphorus, basic pollutants such as BOD, COD, SS and so on.;According to the method of treating wastewater according to the present invention, it is possible to remove 95% or more phosphorus, 75% or more nitrogen, 90% or more BOD, or 90% or more of SS. Significant water quality improvement effects can also be obtained by partially applying the technique of the present invention to existing wastewater treatment plants. When the present invention is applied to the sewage treatment plant of the primary physical precipitation method, the phosphorus content is increased from 25% to 90%, BOD from 30 to 40% to 75%, and SS from 50 to 60% to 90% In case of nitrogen, more than 30% can be removed. When applied to existing standard activated sludge processes, BOD and SS have some improvement in water quality. From 30% to 95% of total phosphorus, 25% to 75% or more of total nitrogen can be improved Do.
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