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Mercury removal from contaminated groundwater: Performance and limitations of amalgamation through brass shavings

机译:从受污染的地下水中去除汞:铜屑的合并性能和局限性

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摘要

Brass shavings have been proposed as a cost-effective filter material to remove Hg from contaminated groundwater. This method, which is based on the reduction of reactive Hg(II) and subsequent formation of amalgams, has been shown to be fast and effective in the short term. However, the effectiveness of brass filters and their stability over the long term, especially if used in passive filter systems such as permeable reactive barriers (PRB) under high flow conditions, is unknown. To evaluate the performance and limitations of brass shavings for Hg removal from contaminated groundwater, we performed longterm pilot scale filtration tests (6 and 28 months) at two former wood impregnation sites with severe groundwater contamination (up to 870 mu g L-1 Hg). The results showed that even under high flow conditions (>60 m d(-1)), 60-80% of the Hg was removed in the first 8 mm of the brass shavings filter bed. The kinetics of filtration, Hg total removal performance (>99.95%), and loading capacity (164 g L-1) surpassed those of a Hg-specific synthetic resin (LEWATI (R) MonoPlus TP-214). However, under natural pH conditions (pH 6.4 and 6.7), Zn was leached from the brass and exceeded the threshold value (0.5 mg L-1) in the filter outflow by up to a factor of 40. Increasing pH (>8.5) decreased the Zn concentration (<0.05 mg L-1) but affected Hg removal due to the formation of Zn-hydroxide/carbonate coatings on the brass (up to 15% performance reduction). Thus, the use of brass shavings as an exclusive filter material in PRBs is restricted to aquifers with high pH. However, brass is ideal as a low-cost, thin-bed prefilter in onsite systems to remove the main Hg load from groundwater when Zn release is managed. (C) 2016 Elsevier Ltd. All rights reserved.
机译:黄铜屑已被提议作为一种经济有效的过滤材料,用于去除受污染的地下水中的汞。该方法基于减少反应性Hg(II)和随后形成汞合金,已在短期内显示出快速有效的方法。但是,黄铜过滤器的有效性及其长期稳定性,尤其是在高流量条件下用于无源过滤器系统(例如可渗透反应性屏障(PRB))的情况下,尚不清楚。为了评估黄铜屑从污染的地下水中去除汞的性能和局限性,我们在两个以前的木材浸渍场所(地下水重度污染高达870μg L-1 Hg)下进行了中试规模的长期过滤试验(6和28个月) 。结果表明,即使在高流量条件下(> 60 m d(-1)),黄铜屑过滤床的前8 mm也会除去60-80%的Hg。过滤动力学,汞的总去除性能(> 99.95%)和负载量(164 g L-1)超过了汞专用合成树脂(LEWATI MonoPlus TP-214)。但是,在自然pH条件(pH 6.4和6.7)下,锌从黄铜中浸出并超过过滤器流出物中的阈值(0.5 mg L-1)达40倍。pH升高(> 8.5)降低了锌的浓度(<0.05 mg L-1),但由于黄铜上形成了氢氧化锌/碳酸盐镀层而影响了汞的去除(性能降低了15%)。因此,在PRB中将黄铜屑用作独家过滤材料仅限于具有高pH值的含水层。但是,黄铜是现场系统中低成本,薄床预过滤器的理想之选,可以在管理锌释放时从地下水中去除主要的汞负荷。 (C)2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Water Research》 |2016年第1期|272-280|共9页
  • 作者单位

    Tech Univ Carolo Wilhelmina Braunschweig, Abt Umweltgeochem, Inst Geookol, D-38106 Braunschweig, Germany;

    Tech Univ Carolo Wilhelmina Braunschweig, Abt Umweltgeochem, Inst Geookol, D-38106 Braunschweig, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mercury; Groundwater; Brass; Remediation; Permeable reactive barrier (PRB); Pilot plant;

    机译:汞;地下水;黄铜;修复;渗透性反应屏障(PRB);中试工厂;
  • 入库时间 2022-08-17 13:41:48

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