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首页> 外文期刊>Australian Geomechanics >EFFECTIVE REMEDIATION OF GROUND WATER IN ACID SULPHATE SOIL TERRAIN1
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EFFECTIVE REMEDIATION OF GROUND WATER IN ACID SULPHATE SOIL TERRAIN1

机译：酸性硫酸盐土壤中地下水的有效修复1

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Acidic groundwater, generated from acid sulphate soil (ASS), is a major geo-ertvironmental problem in Australia. Manipulation of groundwater through the use of weirs and gates in the nearby creeks and drains of ASS, which is being practised right now for preventing pyrite oxidation, is not effective in low land floodplains due to the risk of flooding. The application of a permeable reactive barrier (PRB) can be an alternative for remediation of acidic groundwater in such floodplains. Laboratory column experiments were carried out prior to installation of the PRB for examining the efficiency of the material. Results of these experiments have shown that recycled concrete could effectively neutralise the acidic water for longer periods with complete removal of aluminium (Al) and iron (Fe). Despite the reduction of the efficiency of the recycled concrete due to armouring by accumulated precipitates of Al and Fe, excellent performance was observed for an extended period under controlled laboratory condition. Following these results, a pilot PRB was installed in the Broughton Creek flood plains in southeast NSW to observe its performance under varying natural conditions of the field. The PRB has been maintaining near neutral pH with complete removal of Al and Fe from the groundwater of ASS matching with the results of column test. The promising performance of the pilot PRB for the last three years shows that PRB can be used as one of the cost effective and environmental friendly alternative to other recently utilised techniques in ASS.
机译：由酸性硫酸盐土壤（ASS）产生的酸性地下水是澳大利亚的主要地质环境问题。目前正在为防止黄铁矿氧化而在附近的ASS的小河和排水沟中使用堰和闸来操纵地下水，但由于洪水的风险，这种方法在低陆平原地区并不有效。渗透性反应性隔离层（PRB）的应用可以替代此类洪泛区中的酸性地下水。在安装PRB之前进行了实验室色谱柱实验，以检查材料的效率。这些实验的结果表明，再生混凝土可以有效地中和酸性水更长的时间，同时完全去除铝（Al）和铁（Fe）。尽管由于铝和铁的累积沉淀物铠装而使再生混凝土的效率降低，但在受控的实验室条件下长时间观察到了出色的性能。根据这些结果，在新南威尔士州东南部的布劳顿克里克（Broughton Creek）洪泛平原安装了一个试验性PRB，以观察其在油田自然条件变化下的性能。 PRB一直保持接近中性的pH，并从ASS的地下水中完全去除了Al和Fe，与柱测试的结果相符。试点PRB在过去三年中表现良好，表明PRB可以作为ASS中其他最近使用的技术的一种经济高效且环保的替代方案。

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