Study of an integrated wastewater treatment system
清洁型一体化污水处理系统研究

Aiming at low sludge production and odors emission for small and decentralization wastewater treatment system,a novel integrated system was developed.The system consists of three units,an integrated oxidation ditch with vertical circle(IODVC) for wastewater treatment,an oligochaete reactor for sludge reduction,and a biofiltration reactor for odors removal.Pilot-scale system experiment results indicated that COD,NH 4-N and SS were less than 35 mg/L,1 mg/L and 20 mg/L,respectively.The concentration of ammonia and hydrogen sulfide in outlet of the biofiltration reactor reached the first and third class of the emission standards for odor pollutants.The discharged excess sludge was decreased 46.4%,and specific resistance decreased little after treated by oligochaete worms.This system is cost-effective,land-saving,and easily operated.