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Electrochemically induced oxidative removal of As(III) from groundwater in a dual-anode sand column

Tong, Man ; Yuan, Songhu ; Wang, Zimeng ; Luo, Mingsen ; Wang, Yanxin

Journal of hazardous materials, 2016-03, Vol.305, p.41-50 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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  • Título:
    Electrochemically induced oxidative removal of As(III) from groundwater in a dual-anode sand column
  • Autor: Tong, Man ; Yuan, Songhu ; Wang, Zimeng ; Luo, Mingsen ; Wang, Yanxin
  • Assuntos: Arsenic ; Electrolysis ; Ferrous iron ; Groundwater remediation ; Oxidation
  • É parte de: Journal of hazardous materials, 2016-03, Vol.305, p.41-50
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] •A dual-anode flow-through sand column was configured for arsenic treatment.•As(III) was oxidized efficiently by the anode and O2 in the presence of Fe(II).•Total arsenic was removed by the adsorption/co-precipitation of Fe(III).•This electrochemical process could be applicable for treating As in groundwater. In situ treatment of high-arsenic groundwater cost-effectively is still challenging. We proposed an in situ treatment approach which utilizes O2 produced from groundwater electrolysis to increase the redox potential for oxidative removal of arsenic. A sand column was configured to simulate groundwater flow in an aquifer, and a stable anode, a stable cathode and an iron anode were arrayed in an upward mode in the column to evaluate the performance on arsenic removal from the groundwater induced by the oxidative precipitation of Fe2+ by O2. As(III) at 500μg/L was efficiently oxidized to As(V) by the stable anode followed by the reactive oxidants produced from Fe(II)-O2, and total As were completely removed by the newly formed amorphous iron hydroxides. Quantitative models for the dependence of As(III) oxidation, total As removal and Fe(II) oxidative precipitation on the flow rate and the current density applied to Fe anode were developed. The presence of humic substance promoted the oxidation of As(III) on the stable anode but inhibited the oxidation and removal induced by Fe(II) oxidative precipitation. A stable performance on As(III) oxidation and removal was observed in a 10-day continuous operation. Results from this study prove that groundwater electrolysis could be applicable for oxidative removal of As(III) in porous media, with a controllable and lasting treatment efficiency.
  • Editor: Netherlands: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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