Discussion on Emergency Treatment Methods for Secondary River Pollution in Changzhou—Taking Anding River Channel as an Example
The Anding River in Menghe Town is a typical black and odorous water body.The water quality of the river is studied in this paper,and the water quality of 17 assessment sections does not meet the Class Ⅳ standard of Environmental Quality Standards for Surface Water(GB 3838-2002).The main pollution factors are ammonia nitrogen,total phosphorus and total nitrogen with exceeding rates of 100%,88%,and 100%respectively.According to the needs of river regulation and drainage,emergency treatment is carried out on the river.Emergency treatment devices are built at both ends of the river and at places with large amounts of pollutants.The treatment process includes denitrification(biofilm method)+ activated sludge method + MBR(Membrane Bio-Reactor)membrane,and the effluent is discharged directly into the river channel;sewage interception wells are set up at the sewage discharge inlet along the river;the river aeration system is set up in the seriously polluted area of the river.The results show that the engineering effect is good,the removal rate of Chemical Oxygen Demand(COD)is more than 90%,the removal rate of ammonia nitrogen is more than 98%,and the water quality of the river is improved from Class inferior V to Class V and Ⅳ.
secondary riverblack and odorous water bodypollution emergency treatmentMBR
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