高浓度分散染料废水电渗析脱盐可行性试验

THE FEASIBILITY EXPERIMENT OF HIGH CONCENTRATION DISPERSAL DYEING WASTEWATER WITH ELECTRODIALYSIS DESALINATION PROCESS

采用"MgO中和、Fe/C微电解、混凝沉淀"组合工艺对高盐度分散染料废水进行生化前预处理工艺研究,小试和中试试验结果表明,对COD为8 000～12 000 mg/L、色度为2 000倍、含盐量由17.75%、酸度为5.2%当量硫酸的废水,经组合工艺前处理及ED膜脱盐后,COD去除率为78%;色度小于150倍,去除率为92.5%;含盐量小于1%,脱盐率高达94.8%;BOD5/COD从0.02～0.05上升至0.42。结果表明,应用该组合工艺对分散染料废水进行预处理和ED膜脱盐具有技术可行性。

Adopting the method of ＂MgO to preneutralizate,Fe/C micro-electrolysis, Coagulating Sedimentation＂combined biochemical pretreatment process to pretreat the high salinity disperse dye wastewater. The small and pilot experiments results showed that when the sulfuric acid wastewater whose COD was 8 000-12 000 mg/L, the chroma was 2 000 times ,the salt content was 17.75%, the acidity was 5.2% was pre-treatment by combined process and the ED membrane desalination,the COD, eolority and salinity removal rates were 78%, 92.5% and 94.8% respectively, the chroma was less than 150 times and salt content was less than 1% ,the value of BODJCOD rose up to 0.42 from 0.02~0.05.The results showed that pretreatment and ED membrane desalination of disperse dye wastewater by combined process had the technical feasibility.