内电解-电化学氧化耦合工艺预处理高浓度印染废水

Pretreatment of high concentration dyeing wastewater by coupling technique of internal electrolysis and electrochemical oxidation

以高浓度印染废水为处理对象,对应用内电解-电化学氧化耦合技术处理高浓度印染废水的可行性和处理效果进行了考察,探讨了固液比、铁炭体积比、电流密度、初始pH值及反应时间对废水COD和色度去除率的影响,以确定最佳工艺条件.结果表明:在固液比为38%、铁炭体积比为1∶1、电流密度为9 mA/cm2、初始pH值为3、反应时间为36 h的最佳工艺条件下,废水COD和色度去除率分别达到58.4%和93.6%,说明采用内电解-电化学氧化耦合工艺对高浓度印染废水进行预处理是有效可行的.

Taking the high concentration dyeing wastewater as research subject, the feasibility and effect of pretreatment by internal electrolysis and electrochemical oxidation composited technology is studied. The impacts of the influenc-ing factors such as solid-to-liquid ratio, carbon/iron volume ratio, current density, initial pH value and reaction time on the chemical oxygen demand （COD） removal efficiency and decoloration rate are analyzed in order to determine the optimal conditions. The results show that up to 58.4% COD and 93.6% color could be eliminated under the optimum conditions of solid-to-liquid and carbon/iron volume ratio of 38% and 1 ： 1 respectively, cur-rent density of 9 mA/cm^2, for a run time of 36 h at pH 3. This demonstrates that the coupling technique of internal electrolysis and electrochemical oxidation for pretreating high concentration dyeing wastewater is effective and feasible.