System for Additional Removal of Nitrogen and Phosphorus from Treated Wastewater

摘要

An object of the present invention is directed to a biological treatment of sewage systems, particularly, in addition to the installation in an existing activated sludge process or a nitrogen / phosphorus removal single sludge process to improve the organic substances, nitrogen and phosphorus removal.; Consists of anoxic / DPB (1) and the aerobic tank (2) and the anaerobic tank 3 and the acid fermentation tank 4 and the reservoir 5 and the final settling tank (6), the aerated liquid from the conventional process anoxic / DPB (1 ) it is supplied to; The primary sludge is fed to the acid fermentation tank (4); Part of the sludge from the final settling tank 6 is supplied to the anaerobic tank (3), the aerated liquid is discharged through the anoxic / DPB (1) and the aerobic tank (2) via a final settling tank (6); The primary sludge is joined with the acid fermentation tank 4 and through the reservoir (5) after the joining, and the sludge is conveyed from the final settling tank (6) in the anaerobic tank (3), re-aeration fluid from the anoxic / DPB (1), the anoxic tank / the system via a DPB (1) and the aerobic tank (2) to be discharged through a final settling tank (6).