三维电极电化学反应器降解有机废水中的EDTA

Electrochemical degradation of organic wastewater containing EDTA with three-dimensional electrode reactor

研究一种基于三维电极电化学反应器处理有机废水的新方法。研究结果表明:采用活化后的活性炭作为粒子电极,通过产生?OH自由基有效降解废水中的EDTA,其去除率受进水pH、电流和电导率等影响较大;在?OH自由基的作用下,EDTA首先被降解成伯胺等中间产物,进而又被矿化为CO2,H2O和NH3。在进水pH为6.0,进水流量为200 mL/min,水温为25℃,电导率为0.15 S/m,电流为200 mA时,电解1 h,总有机碳(TOC)的去除率可以达到96.40%;经50次循环实验,TOC去除率仍可保持在90%以上。

The electrochemical degradation of organic wastewater containing EDTA was investigated using a novel three-dimensional electrode reactor.The results show that using activated carbon as particle electrode,EDTA in organic wastewater can be efficiently removed by ？OH radicals produced in the reactor,while its removal efficiency is significantly dependent on current,electric conductivity and pH of the wastewater.EDTA is firstly degraded into primary amine during the action of ？OH radicals,then mineralized into CO2,H2O and NH3.The removal efficiency of total organic carbon（TOC） is 96.40% at 200 mA,0.15 S/m of electric conductivity,1 h of electrolysis time,25 ℃,200 mL/min of influent flow rate,pH 6.0.The removal efficiency of TOC maintains 90% when it is circulated times is 50.