METHOD FOR BIOLOGICAL TREATMENT OF SEWAGE

摘要

The invention provides a method for biological treatment of sewage, comprising: a) introducing the sewage into an aeration tank seeded with activated sludge for a sufficient aeration treatment, b) introducing the treated sludge discharged from the aeration tank into a sedimentation tank for solid-liquid separation, c) returning a part of settled sludge after solid-liquid separation to a mixing tank in which the sludge is homogeneously mixed with THPS fed into the mixing tank from a THPS storage container, and d) returning the sludge mixed with the THPS to the aeration tank, wherein the method is carried out continuously. The settlement performance of sludge can be improved and the yield of excess sludge during the biological treatment can be reduced by the method.