短程硝化—铁炭微电解工艺处理焦化废水

Treatment of Coking Wastewater by Shortcut Nitrification-Iron-carbon Micro-electrolysis Process

以废刚玉石墨粉末和废铁屑作为电极,分别采用铁炭微电解工艺和短程硝化—铁炭微电解工艺对焦化废水进行脱氮处理。实验结果表明,采用短程硝化—铁炭微电解工艺对焦化废水脱氮效果好于只采用铁炭微电解工艺。铁炭微电解的最佳反应条件:废水初始pH为3.0,反应时间为70min,铁炭质量比[m(Fe)∶m(C)]为1.0∶1.3,混凝pH为9.0。在此最佳反应条件下,铁炭微电解工艺TN去除率为8.0%,短程硝化—铁炭微电解工艺NO2--N的去除率为57.0%,TN的去除率为50.0%。

Using waste corundum-graphite powder and scrap iron as electrodes, the denitrification of coking wastewater was carried out separately by iron-carbon micro-electrolysis process or shortcut nitrification- iron-carbon micro-electrolysis process. The experimental results show that the denitrification effect by shortcut nitrification - iron-carbon micro-electrolysis process is better than that by iron-carbon micro-electrolysis process. Under the optimum reaction conditions of wastewater pH 3.0, reaction time 70 min, mass ratio of Fe to C 1.0 ： 1.3 and coagulation pH 9.0, the removal rate of TN by iron-carbon micro-electrolysis process is 8.0% , however the removal rates of NO2- -N and TN by shortcut nitrification - iron-carbon micro-electrolysis process are 57. 0% and 50. 0%, respectively.