Study on treatment of high concentration of dye-wastewater with coupling technique of electrochemical oxidation and internal-electrolysis

The wastewater with high concentrations of dyes and salt from dye production process was treated by a new technological process of combining micro-electrolysis and ferric-carbon internal electrolysis.The factors affecting the removal of color and COD from the wastewater were investigated,such as ratio of solid to liquid,ratio of Fe to C,current density.Research on the most influence factors showed that when the ratio of solid to liquid was 1∶20,the volume ratio of iron to carbon was 1∶1 and current density was 9.26 mA/cm2,the process can get an excellent removal rate in the experience.After 30 hours treatment,the average effluence water color reached 1000,and the removal rate of COD was 56.5%.Considering treatment effectiveness and economical cost,micro-electrolysis and ferric-carbon internal electrolysis composited technology could be effective and feasible.