Analysis of Influent Water Quality and Process Scheme of Expansion,Upgrading and Reconstruction Project of a WWTP
In order to support the rapid development of regional economy and local industries,high-quality economic parks and industrial parks have been built at home;meanwhile,in some parks there is a certain proportion of industrial wastewater in the influent of municipal wastewater treatment plants(WWTPs),which increases the difficulty of effluent treatment.The treatment process needs to be further studied according to the characteristics of influent water quality.This project is located in Wujiang Economic Development Zone of Suzhou City,the design scale is 100 000 m3/d.The industrial wastewater in the service area accounts for 20％～30％.The impact of CODCr,TN and TP in industrial wastewater has a significant impact on the current wastewater treatment.This project is based on the field survey of water quality survey data collation and analysis,and the principle of process stability,reliable operation,economic rationality,and land saving is implemented.Therefore,the"Bardenpho+horizontal flow secondary sedimentation tank+biological aerated filter+high-efficiency sedimentation tank+deep-bed filter+sodium hypochlorite disinfection"process route is selected,which can strengthen nitrogen and phosphorus removal and CODCr removal,and set up an emergency sedimentation tank at the front end of the water inlet to assist the treatment of abnormal water.Since the plant was put into operation in July 2022,the effluent quality has been good and stable in the past one year.The design scheme of this project can provide reference for the design of municipal WWTPs which have a certain proportion of industrial wastewater in the piped water and are impacted by CODCr,TN and TP impacts.
expansion and upgrading/reconstruction projectindustrial wastewaterwater quality investigationenhanced nitrogen and phosphorus removalenhanced CODCr removal
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