废铁屑深度处理焦化废水新方法

New Method of Advanced Treatment of Coking Wastewater by Scrap Iron

利用镀铜铁屑作为电极在不同控制条件下深度处理焦化废水,探索研究最佳处理方案。未通电、恒电流、恒电压和脉冲电流四种模式的对比实验表明:脉冲模式下,单位降解COD的耗电量大大小于恒电流和恒电压模式;同时,COD去除率与时间t的线性相关性最好,有利于连续去除COD。因而,在实际操作工艺中更具有可操作性。脉冲电流模式下向降解液中添加氧化剂能取得更好的降解效果,反应1h时,COD去除率达到84%,色度去除率达91%,降解后废水COD为43mg/L,已达到国家一级排放标准。

Copperized-iron was used as electrode for advanced treatment of coking wastewater in different controlled condition to explore the optimal treatment scheme.The contrast experiment of internal electrolysis,constant current mode,constant potential mode and pulse current mode showed that in the pulse current mode,power consumption for the unit COD removal was much less than in the constant current and constant potential mode.And at the same time,the linear correlation between COD removal and treatment time of pulse current mode was the best.Therefore,pulse current mode is considered to be more operable in actual operation process.Adding oxidant to the solution to be degradated at the pulse currents mode can further improve the degradation.After 1 hour,the COD reaches 43mg/L with removal of 84%,and the efficiency of decolorization reaches 91%,showing that the quality of output water has reached the Ⅰ Grade discharge standards of water pollutants.