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Permeable reactive barrier (PRB) technology: An innovative solution for the remediation of acidic groundwater from acid sulphate soil (ASS) terrain

机译:渗透性反应屏障(PRB)技术:从酸性硫酸盐土壤(ASS)地形中修复酸性地下水的创新解决方案

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摘要

The remediation of acidic groundwater contaminated with potentially toxic metals such as aluminium (Al) and iron (Fe) resulting from the oxidation of sulphidic materials in acid sulphate soils (ASSs) is a challenging geo-environmental problem that requires innovative engineering solutions. In low-lying coastal floodplains, the remediation strategies of groundwater manipulation (e.g. fixed-level weirs) and tidal buffering (e.g. two-way modified floodgates) are not feasible due to the risk of flooding during heavy rainfall events and their inability to prevent pyritic oxidation. In view of this in 2006, the first pilot subsurface permeable reactive barrier (PRB) using recycled concrete for the remediation of acidic groundwater (~ pH 3) was employed in ASS terrain in southeast New South Wales, Australia. While monitoring has confirmed the PRB has successfully neutralized the acidic groundwater to ~ pH 7.3 and removed ~ 95% of Al and Fe, this technology is not without its challenges. These have included the: (1) selection of the appropriate reactive material; (2) elucidation of the mechanisms involved in the neutralization of the acidic groundwater; (3) chemical armouring and possible clogging of the recycled concrete by Al and Fe oxy/hydroxide precipitates; and (4) thus, uncertainty regarding the longevity of the PRB. This paper will present details on the screening process of reactive materials, the installation of the PRB, the column experiments simulating the flow of acidic groundwater through the PRB for the determination of the predominant neutralization reactions occurring within the PRB, the long-term performance of the PRB and the current research strategy for determining its longevity.
机译:酸性硫酸盐土壤(ASSs)中硫化物的氧化导致被潜在有毒金属(例如铝(Al)和铁(Fe))污染的酸性地下水的修复是一个富有挑战性的地球环境问题,需要创新的工程解决方案。在低洼的沿海洪泛区中,由于暴雨期间洪水的风险及其无法预防黄铁矿的危害,地下水操纵(例如固定水位堰)和潮汐缓冲(例如双向闸门)的修复策略不可行。氧化。有鉴于此,2006年,澳大利亚新南威尔士州东南部的ASS地形采用了第一个使用再生混凝土修复酸性地下水(〜pH 3)的试点地下渗透性反应屏障(PRB)。监测证实PRB已成功将酸性地下水中和至pH值为7.3,并去除了约95%的Al和Fe,但这项技术并非没有挑战。其中包括:(1)选择合适的反应性材料; (2)阐明中和酸性地下水的机制; (3)化学铠装和铝和铁的氧/氢氧化物沉淀物可能会堵塞再生混凝土; (4)因此,有关PRB寿命的不确定性。本文将详细介绍反应性材料的筛选过程,PRB的安装,模拟酸性地下水通过PRB的柱实验,以确定PRB中发生的主要中和反应,长期性能等。 PRB和确定其寿命的当前研究策略。

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