Research On The Removal Process Of 1,2-dichloroethane In Wastewater In Chemical Industry Park

Chemical park wastewater contains a large number of toxic and hazardous hard-to-degrade pollutants.Among them,1,2-dichloroethane often escapes into the environment due to improper disposal,causing significant ecological and human health hazards.Based on the actual demand of treating high concentration 1,2-dichloroethane wastewater in a sewage plant in a chemical industry park,biological treatment technology and Fenton oxidation technology are selected to study its degradation,which has important industrial application prospects.In this paper,the domesticated sludge was used to treat the target wastewater,and the effluent 1,2-dichloroethane concentration was<0.02 mg/L,and the degradation rate was>99.9%.The domestication of the sludge resulted in a change in the structure of the bacterial community,which greatly improved the degradation efficiency of 1,2-dichloroethane while having the same COD and TOC removal effect as the original sludge,and its microbial community diversity was also well maintained,Thauera and SMI A02 are the dominant bacteria in domesticated sludge and are closely related to the rapid degradation of 1,2-dichloroethane.When the initial pH=3 of wastewater is 3,the initial concentration of H2O2 is 20mmol/L,the initial dosage of Fe2+ is 20mnol/L,and the reaction time is 60min,the highest removal rate of 1,2-dichloroethane is 88.0%,and the removal rate of TOC is 79.The research shows that both activated sludge process and Fenton oxidation process can be used as options for the treatment of high concentration 1,2-dichloroethane wastewater in chemical industrial park wastewater plants.