Application of Composite Multi-stage AO,Ozonation/MBBR in a Quasi-category Ⅳ Mixed Waste water Treatment Plant
The first phase of a sewage treatment plant in Zhejiang Province has a treatment capacity of 20×10 4 m3/d,municipal sewage and industrial wastewater each account for about 50％of the influent.The main treatment process adopts the"aerated grit chamber+composite multi-stage AO process+efficient sedimentation tank+ozonation/MBBR+cloth-media filtration+sodium hypochlorite disinfection".The composite multi-stage AO combines the advantages of the multi-stage AO and Bardenpho process.The operating results show that when the average COD,TN and TP of the influent are 366 mg/L,34.7 mg/L and 6.25 mg/L,the corresponding effluent concentrations are decreased to 19 mg/L,7.5 mg/L and 0.13 mg/L,with removal rates of 95％,78％and 98％,respectively.The effluent quality meets the quasi-category Ⅳ requirements in table 2 of the Discharge Standard for Major Pollutants for Municipal Wastewater Treatment Plant(DB 33/2169-2018)in Zhejiang Province.The process has strong impact resistance,stable effluent,and high treatment efficiency,making it suitable for the design of wastewater treatment plants with high effluent standards,especially those requiring deep removal of COD and TN for mixed sewage treatment.
multi-stage AO processquasi-category Ⅳ standard of surface waterstep-feedmixed sewageozonedyeing wastewater
NETL
NSTL
万方数据
