Design case of large-scale sewage treatment plant upgrading and expansion in an industrial park in Zhejiang province
The sewage treatment plant in an industrial park of Zhejiang province expand to a to-tal capacity of 500 000 m3/d,including a 300 000 m3/d upgrade project and a 200 000 m3/d expan-sion project.The project's inlet water is mainly composed of industrial wastewater from printing and dyeing and chemical industries,accounting for about 80％of the total inlet water volume.The inlet water contains many refractory and soluble organic substances with poor biodegradability.The effluent quality needs to meet the Class A standard of the Discharge standard of pollutants for municipal wastewater treatment plant(GB 18918-2002),which is extremely difficult to achieve.To ensure the stability and compliance of the effluent quality,the project has carefully de-termined the main treatment process for the sewage through pilot tests based on current operational experience:The upgrade project adopts biochemical system transformation-Fenton catalytic oxi-dation-Filtration;the expansion project adopts inlet water regulation-Coagulative precipitation-Enhanced biochemical treatment-Fenton catalytic oxidation-Filtration.Since the project was put into operation,the effluent has been stable and up to standard.
Industrial wastewaterAdvanced oxidation processesFenton catalytic oxidationPrinting and dyeing industryChemical industry
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