Apparatus and method for wastewater treatment by an air-aeration activated sludge method comprising a hog / anaerobic sludge treatment tank

摘要

The present invention relates to a wastewater treatment device for treating aerobic biological treatment using aerated biological activated sludge, which has a multi-stage reaction tank to improve the precipitation and treatment efficiency of organic matter, phosphorus nitrogen and the like and transports the return sludge in an anaerobic / anaerobic sludge treatment tank And methods. The water quality of the effluent which has not been subjected to the anaerobic / anaerobic sludge treatment process according to the present invention and the effluent treatment process of the present invention was compared. The average dissolved solute COD, suspended solids (SS), phosphorus and total nitrogen concentrations were 60 mg / l 38 mg / l 3 when there was no sludge treatment tank based on the mean of 1000 mg / l inflow COD concentration. 2 mg / l and 21 mg / l, respectively. However, when treated with sludge, the mean concentrations of dissolved COD, suspended solids (SS), phosphorus and total nitrogen were 45 mg / l and 12 mg / Mg / l or less