标题: Remediation of Cu-phenanthrene co-contaminated soil by soil washing and subsequent photoelectrochemical process in presence of persulfate
作者: Tao, YF (Tao, Yufang); Huang, HB (Huang, Haibin); Zhang, H (Zhang, Hui)
来源出版物: JOURNAL OF HAZARDOUS MATERIALS 卷: 400 文献号: 123111 DOI: 10.1016/j.jhazmat.2020.123111 出版年: DEC 5 2020
摘要: A promising technology was proposed for the remediation of Cu and phenanthrene (PHE) co-contaminated soil. Firstly, Cu and PHE were simultaneously removed from soil using an extraction agent containing ethylenediaminetetraacetic acid (EDTA) and Tween 80 (TW80). Specifically, Cu was mobilized by the chelation of EDTA while PHE was desorpted from soil by TW80 micelles. At 20 mL g(-1) of liquid to soil ratio, 10 g L-1 TW80 and 1 mM EDTA, 73.5% Cu and 68.1% PHE were removed by soil washing. The extraction agent was then recovered from effluent by photoelectro-persulfate (PE/PS) process after soil washing. Under the conditions of 10 mM PS, 4 mA cm(-2) current density, natural pH of 3.5 and 150 min treatment, 83.6% Cu was reduced to elemental copper but only 36.8% EDTA was recovered, while 99.6% PHE was eliminated and 94.0% TW80 was recovered. The result of quenching experiments indicated PHE was predominantly oxidized by sulfate radical, though hydroxyl radical and singlet oxygen were also identified by electron paramagnetic resonance technique. The recovered extracting agent could be reused for further three washing cycles. The results demonstrated that soil washing followed by PE/PS process could be a cost-effective remediation technology for heavy metal and organic cocontaminated soil.
作者关键词: Co-contaminated soil; Cu-phenanthrene; Persulfate; Photoelectrochemical; Process; Soil washing
地址: [Tao, Yufang; Huang, Haibin; Zhang, Hui] Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.
通讯作者地址: Zhang, H (通讯作者)，Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.
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