Electrochemical treatment of mature landfill leachate using Ti/RuO2-IrO2 and Al electrode: optimization and mechanism
Electrochemical treatment of mature landfill leachate using Ti/RuO2-IrO2 and Al electrode: optimization and mechanism
复制标题
Ti/RuO2-IrO2 和 Al 电极电化学处理成熟垃圾渗滤液：优化和机理
DOI：
10.1039/c6ra05080h
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Zhou Yan
中科院分区：
文献类型：
--
作者：
Li Juan;Yang Zhao-hui;Xu Hai-yin;Song Pei-pei;Huang Jing;Xu Rui;Zhang Yi-jie;Zhou Yan
如今，通过电化学氧化技术提高垃圾渗滤液中难降解污染物的消除效果引起了人们的广泛关注。在这项研究中，采用Ti/RuO2-IrO2和Al电极的阳极氧化和阴极混凝工艺相结合的方式来处理成熟的垃圾渗滤液，其可生物降解率（BOD5/COD）非常低，为0.12。采用响应面法 (RSM) 研究了电流密度、pH 值和氯离子浓度对化学需氧量 (COD) 和氨氮 (NH3–N) 去除的影响。当电流密度为0.1 A cm−2、pH为6.37、氯离子浓度为6.5 g L−1、电解时间为150 min时，达到83.7% COD和100% NH3–N去除的最佳条件。 In addition, heavy metals were partly removed.通过气相色谱-质谱联用仪（GC-MS）、环境扫描电子显微镜结合能谱仪（ESEM/EDS）和傅里叶变换红外光谱仪（FT-IR）对垃圾渗滤液和垃圾填埋场产生的污泥中的有机成分进行分析，阐明了污染物的主要降解机制，包括氧化、混凝和沉淀。 cathode.这些结果表明电化学过程可能是一种方便有效的垃圾渗滤液处理方法。
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/RuO2–IrO2 and Al electrodes, was adopted to treat the mature landfill leachate with a very low biodegradability ratio (BOD5/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 (NH3–N) were investigated by response surface methodology (RSM). The optimum condition of 83.7% COD and 100% NH3–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.