METHOD AND DEVICE FOR TREATING SEWERAGE FLOWING INTO TERMINAL DISPOSAL PLANT

摘要

PROBLEM TO BE SOLVED: To provide a treating device for sewerage flowing into a terminal disposal plant capable of progressing the treating reaction at the sewerage terminal disposal plant in a relatively short time and capable of economically obtaining the good water subjected to nitrogen removing treatment and phosphorus removing treatment and capable of operating with a reduced expense by simultaneously performing BOD treatment and at least one kind of nitrogen removing treatment and phosphorus removing treatment. SOLUTION: In the treating device, a biologically treating device for biologically treating the industrial waste water relatively high in a BOD concentration and relatively low in a nitrogen concentration and a phosphorus concentration at a plant generating the industrial waste water, an introducing means for introducing the industrial waste water treated at the biologically treating device to the sewerage terminal disposal plant and a means for introducing domestic waste water to the sewerage terminal disposal plant and for subjecting the domestic waste water to mixing treatment with the industrial waste water are provided. The biologically treating device of the industrial waste water at the plant generating the industrial waste water is relatively low in the removing capacity by oxidation of BOD, and the treated water obtained at the biologically treating device has relatively high BOD concentration releasable to the sewerage.