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Removal of heavy metals from fly ash leachate using combined bioelectrochemical systems and electrolysis

机译:结合生物电化学系统和电解法去除粉煤灰渗滤液中的重金属

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摘要

Based on environmental and energetic analysis, a novel combined approach using bioelectrochemical systems (BES) followed by electrolysis reactors (ER) was tested for heavy metals removal from fly ash leachate, which contained high detectable levels of Zn, Pb and Cu according to X-ray diffraction analysis. Acetic acid was used as the fly ash leaching agent and tested under various leaching conditions. A favorable condition for the leaching process was identified to be liquid/solid ratio of 14:1 (w/w) and leaching duration 10 h at initial pH 1.0. It was confirmed that the removal of heavy metals from fly ash leachate with the combination of BESs and ER is feasible. The metal removal efficiency was achieved at 98.5%, 95.4% and 98.1% for Cu(Ⅱ), Zn(Ⅱ), and Pb(Ⅱ), respectively. Results of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) indicated that Cu(Ⅱ) was reduced and recovered mainly as metal Cu on cathodes related to power production, while Zn(Ⅱ) and Pb(Ⅱ) were not spontaneously reduced in BESs without applied voltage and basically electrolyzed in the electrolysis reactors.
机译:根据环境和能量分析,测试了一种新的组合方法,该方法使用生物电化学系统(BES)和电解反应器(ER)从飞灰渗滤液中去除重金属,其中X-含量高,可检测到Zn,Pb和Cu射线衍射分析。醋酸用作粉煤灰的浸出剂,并在各种浸出条件下进行了测试。浸出过程的有利条件是液/固比为14:1(w / w),在初始pH 1.0时浸出时间为10 h。可以肯定的是,结合BES和ER从粉煤灰渗滤液中去除重金属是可行的。 Cu(Ⅱ),Zn(Ⅱ)和Pb(Ⅱ)的金属去除效率分别为98.5%,95.4%和98.1%。扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)的结果表明,与发电相关的阴极上的C​​u(Ⅱ)主要以金属Cu的形式还原和回收,而Zn(Ⅱ)和Pb(Ⅱ)在没有施加电压的情况下,BESs不会自发还原,并且基本上在电解反应器中被电解。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2014年第15期|1-7|共7页
  • 作者单位

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 578055, China;

    Department of Civil & Environmental Engineering, Center for Sustainable Development & Global Competitiveness, Stanford University, Stanford, CA 94305-4020, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fly ash; Metal recovery; Bioelectrochemical systems; Electrolysis;

    机译:粉煤灰;金属回收;生物电化学系统;电解;
  • 入库时间 2022-08-17 13:22:37

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