School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China; Sichuan Provincial Key Laboratory of Environmental Pollution Prevention on Oil and Gas Fields and Environmental Safety, Chengdu 610500, PR China.
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China.
J Hazard Mater. 2019 May 5;369:655-664. doi: 10.1016/j.jhazmat.2019.02.078. Epub 2019 Feb 22.
In this study, the microelectrolysis system was applied to generate strong reductants, such as free hydrogen [H] and O, and thus removing N-Methyldiethanolamine (MDEA) in overhaul wastewater. Effects of initial influent pH, mass ratio of filings to wastewater, air aeration rate, and reaction temperature on the removal of MDEA were investigated intensively. Experimental results indicate that optimum removal rate of MDEA can be obtained at pH = 2, inlet air rate = 1 L min, mass ratio of filings to wastewater = 1:1 and temperature = 25 °C. About 96.0% Total Organic Carbon (TOC) in overhaul wastewater can be mineralized by ozonation-microelectrolysis-ozonation (OMIO) treatment process. By analyzing the effluent at various stages, it was established that microelectrolysis played a leading role in the destruction of MDEA. The degradation mechanism of MDEA has been clarified through detecting the degradation products with Gas Chromatography-Mass Spectrometer (GC-MS). Subsequently, ozone reacts with intermediate products generated by MDEA degration through OH· pathway under alkaline condition. In short, these results suggest that OMIO system should be proposed as a promising treatment process for the MDEA wastewater.
在这项研究中，微电解系统被用来产生强还原剂，如自由氢[H]和 O，从而去除大修废水中的 N-甲基二乙醇胺（MDEA）。本研究考察了初始进水 pH 值、填充料与废水的质量比、曝气率和反应温度对 MDEA 去除率的影响。实验结果表明，在 pH=2、进气速率为 1 L/min、填充料与废水的质量比为 1:1 和温度为 25°C 时，MDEA 的去除率最高。通过臭氧化-微电解-臭氧化（OMIO）处理工艺，大修废水中约 96.0%的总有机碳（TOC）可被矿化。通过分析不同阶段的出水，确定微电解在 MDEA 的破坏中起主导作用。通过气相色谱-质谱联用仪（GC-MS）检测降解产物，阐明了 MDEA 的降解机制。随后，在碱性条件下，臭氧通过 OH·途径与 MDEA 降解生成的中间产物发生反应。总之，这些结果表明，OMIO 系统可作为一种有前途的 MDEA 废水处理工艺。
