Study On Dyeing Industrial Wastewater Treatment By Fenton Oxidation

Fenton oxidation is a mature,stable advanced oxidation technology which uses Fe²⁺and H₂O₂ as reagents.In the treatment of some dyeing wastewater with various high concentrations of complicated contaminants,using Fenton reagent is a better way with high efficiency,and good controlling conditions.In this work,two kinds of wastewaters,one with“Polyvinyl Alcohol?PVA?”,the other with“reactive blue KN-R”were treated by Fenton Process.At the same time,UV irradiation or microwave assisted Fenton was also investigated.According to the orthogonal experiment,the optimum conditions about wastewater containing PVA were as follows:the reaction temperature was 30?,pH=4;H₂O₂/Fe²⁺?mol?=10,the PVA degradation rate reached more than 88%after 1hour of reaction;and COD removal rate was more than 87%.In the process of UV/Fenton,the optimum conditions were similar to single Fenton oxidation,but the COD removal rate was up to about 91%.In the second part,kind of wastewater within reactive blue KN-R was treated by Fenton process.it was found that t the optimum conditions for the degradation of KN-R by orthogonal experiment were:pH=3,the temperature was 30?,H₂O₂/Fe²⁺?mol?=10,and the degradation rate of KN-R was more than 83%after 1 hour of reaction,and COD removal rate also more than 80%.Furthermore,microwave-assisted Fenton was used to treat this wastewater,the degradation rate of reactive blue KN-R was greater than 84%,and COD removal rate also up to 85%.