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首页> 外文期刊>RSC Advances >Electrochemical treatment of mature landfill leachate using Ti/RuO2–IrO2 and Al electrode: optimization and mechanism
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Electrochemical treatment of mature landfill leachate using Ti/RuO2–IrO2 and Al electrode: optimization and mechanism

机译：使用Ti / Ruo2-IRO2和Al电极的成熟垃圾渗滤液的电化学处理：优化和机理

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Today, improving the elimination of refractory pollutants in landfill leachate through electrochemical oxidation technology has attracted considerable attention. In this study, a combination of anodic oxidation and cathodic coagulation process using Ti/RuO _(2) –IrO _(2) and Al electrodes, was adopted to treat the mature landfill leachate with a very low biodegradability ratio (BOD _(5) /COD) of 0.12. The effects of current density, pH, and the chloride ion concentration on the removal of chemical oxygen demand (COD) and ammonia nitrogen (NH _(3) –N) were investigated by response surface methodology (RSM). The optimum condition of 83.7% COD and 100% NH _(3) –N removal was achieved with a current density of 0.1 A cm ~(?2) and a pH of 6.37, the chloride ion concentration 6.5 g L ~(?1) , and an electrolytic time of 150 min. In addition, heavy metals were partly removed. A main degradation mechanism of the pollutants, including oxidation, coagulation and precipitation, was elucidated by gas chromatography-mass spectrometry (GC-MS), environmental scanning electron microscopy coupled with energy dispersive spectrometer (ESEM/EDS) and Fourier transform infrared spectroscopy (FT-IR) analysis of organic components in landfill leachate and sludge generated at the cathode. These results indicated that the electrochemical processes could be a convenient and efficient method for the treatment of landfill leachate.
机译：今天，通过电化学氧化技术改善垃圾渗滤液中耐火污染物的消除引起了相当大的关注。在该研究中，采用阳极氧化和阴极凝固方法的组合使用Ti / RuO _（2） - α-（2）和Al电极，以具有非常低的生物降解性比率（BOD _（5）来治疗成熟的垃圾填埋液渗滤液（5 / cod）0.12。通过响应面法（RSM）研究了电流密度，pH和氯离子浓度对除去化学需氧量（COD）和氨氮（NH _（3）-N）的影响。 83.7％COD和100％NH _（3）-N除去的最佳条件，其电流密度为0.1a cm〜（Δ2）和6.37的pH，氯离子浓度为6.5g l〜（？1 ），和150分钟的电解时间。此外，部分除去重金属。通过气相色谱 - 质谱（GC-MS）阐明污染物的主要降解机制，包括氧化，凝固和沉淀，环境扫描电子显微镜与能量分散光谱仪（ESEM / EDS）和傅里叶变换红外光谱（FT -Ir）在阴极垃圾渗滤液渗滤液中有机成分分析。这些结果表明，电化学方法可以是一种方便，有效地治疗垃圾填埋液的方法。

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