Fenton process treating small pore-sized ultrafiltration membrane concentrate of printing and dyeing wastewater
Printing and dyeing wastewater is a kind of refractory industrial wastewater,which has the characteristics of large discharge and high pollutant content.In the context of sustainable development,zero(nearly zero)discharge of printing and dyeing wastewater has become an inevitable trend.At present,the treatment of membrane concentrate by catalytic oxidation is a conventional method to achieve zero(nearly zero)emission,while it has the problems of large dosage of catalytic agent,poor treatment effect and secondary pollution.In this study,Fenton method was used to treat the small pore-sized ultrafiltration membrane concentrate of printing and dyeing wastewater.The effects of H2O2 and FeSO4·7H2O dosage,pH and dosing time interval on the treatment effect were investigated.The results showed that the best treatment effect occurred at mass ratio COD∶H2O2 of 1∶1.3,molar ratio H2O2∶Fe2+of 1∶1,initial pH 4.0,callback pH 6.5 and dosing time interval of 60 min.All the main water quality indexes such as COD,color,ammonia nitrogen and total nitrogen in the effluent could meet the emission requirements of'Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry'(GB 4287-2012).The effluent quality was stable,this method could obtain higher economic benefits than other conditions.At the same time,this study compared the Fenton method with the physicochemical and Fenton-like methods.The results showed that the Fenton method had higher economy in treating membrane concentrate of printing and dyeing wastewater,which provides a basis for further engineering practice.
printing and dyeing wastewatersmall pore-sized ultrafiltration membranemembrane concentrateFenton method
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