电催化氧化处理N-甲基二乙醇胺废水

Electrocatalytic oxidation treatment of N-methyldiethanolamine wastewater

将N-甲基二乙醇胺(MDEA)与去离子水按一定比例混合,制得MDEA模拟废水,然后选用电催化氧化技术,研究了去除模拟MDEA废水中总有机碳(TOC)的最佳工艺条件,并应用于工业MDEA废水的处理试验。结果表明:电催化氧化法净化处理模拟MDEA废水最佳工艺条件为:MDEA废水的初始pH值为9,Cl-的初始质量浓度为5000 mg/L,以Ti/RuO_(2)-IrO_(2)电极为正极,电极板间距为2 cm,工作电流为4 A;在此最佳处理工艺条件下,模拟MDEA废水经电催化氧化处理8 h的TOC去除率为91.90%,而工业MDEA废水在同等实验室处理条件下的TOC去除率仅为52.79%,这可能是因实际工业MDEA废水中含有噻吩、苯并三唑、苯环类等复杂有机物且具有更高的化学稳定性,较难处理所致。

The N-methyldiethanolamine(MDEA)simulated wastewater was prepared by mixing MDEA with deionized water in a certain proportion.Then the optimal process conditions for removing total organic carbon(TOC)from simulated MDEA wastewater were studied by using the electrocatalytic oxidation technology,and applied to industrial MDEA wastewater treatment experiments.The results showed that the optimal process conditions for purifying the simulated MDEA wastewater by electrocatalytic oxidation were as follows:the initial pH value of MDEA wastewater at 9;the initial mass concentration of Cl-at 5000 mg/L;using Ti/RuO_(2)-IrO_(2)electrode as the positive electrode;the electrode plate spacing at 2 cm,and the working current at 4 A.Under these optimal treatment conditions,the TOC removal rate of simulated MDEA wastewater after the electrocatalytic oxidation treatment for 8 h was 91.90%,while the TOC removal rate of industrial MDEA wastewater under the same laboratory treatment condition was only 52.79%.This would result from the actual industrial MDEA wastewater containing the complex organic substances such as thiophene,benzotriazole,benzene rings with higher chemical stability,which were difficult to be treated.