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首页> 外文期刊>Environmental Science & Technology >Microbially Mediated Clinoptilolite Regeneration in a Multifunctional Permeable Reactive Barrier Used to Remove Ammonium from Landfill Leachate Contamination: Laboratory Column Evaluation
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Microbially Mediated Clinoptilolite Regeneration in a Multifunctional Permeable Reactive Barrier Used to Remove Ammonium from Landfill Leachate Contamination: Laboratory Column Evaluation

机译：多功能渗透性反应屏障中的微生物介导的斜发沸石再生，用于从垃圾渗滤液中去除铵：实验室色谱柱评估

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摘要

This study focuses on multifunctional permeable reactive barrier (multibarrier) technology, combining microbial degradation and abiotic ion exchange processes for removal of ammonium from landfill leachate contamination. The sequential multibarrier concept relies on the use of a clinoptilolite-filled buffer compartment to ensure a robust ammonium removal in case of temporary insufficient microbial activities. An innovative strategy was developed to allow in situ clinoptilolite regeneration. Laboratory-scale clinoptilolite-filled columns were first saturated with ammonium, using real landfill leachate as well as synthetic leachates as feed media. Other inorganic metal cations, typically present in landfill leachate, had a detrimental influence on the ammonium removal capacity by competing for clinoptilolite exchange sites. On the other hand, the metals had a highly favorable impact on regeneration of the saturated material. Feeding the columns with leachate deprived from ammonium (e.g., by microbial nitrification in an upgradient compartment), resulted in a complete release of the previously sorbed ammonium from the clinoptilolite, due to exchange with metal cations present in the leachate. The released ammonium is then available for microbial consumption in a downgradient compartment The regeneration process resulted in a slightly increased ammonium exchange capacity afterward. The described strategy throws a new light on sustainable use of sorption materials for in situ groundwater remediation, by avoiding the need for material replacement and the use of external chemical regenerants.
机译：这项研究的重点是多功能渗透反应性屏障（multibarrier）技术，结合了微生物降解和非生物离子交换过程，可从垃圾渗滤液中去除铵。顺序多屏障概念依赖于使用斜发沸石填充的缓冲隔室，以确保在暂时性微生物活动不足的情况下，能够有效去除铵。开发了一种创新策略以允许原位斜发沸石再生。首先，使用真实的垃圾渗滤液和合成渗滤液作为进料介质，将实验室规模的斜发沸石填充柱先用铵饱和。通常存在于垃圾填埋场渗滤液中的其他无机金属阳离子，通过竞争斜发沸石交换位点，对除氨能力产生不利影响。另一方面，金属对饱和材料的再生具有非常有利的影响。用缺乏铵的浸出液（例如通过在向上的隔室中的微生物硝化）进给柱子，由于与浸出液中存在的金属阳离子交换，导致先前吸附的铵从斜发沸石中完全释放出来。然后，释放出的铵可用于降级隔室中的微生物消耗。再生过程之后，铵交换容量略有增加。所描述的策略通过避免需要替换材料和使用外部化学再生剂的方式，为吸附剂的可持续利用提供了新的思路，以用于原位地下水修复。

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  • 来源
    《Environmental Science & Technology》 |2010年第9期|P.3486-3492|共7页
  • 作者

    THOMAS VAN NOOTEN; rnLUDO DIELS; rnLEEN BASTIAENS;

  • 作者单位

    Flemish Institute for Technological Research (WTO), Separation and Conversion Technologies, Boeretang 200, 2400 Mol, Belgium;

    rnFlemish Institute for Technological Research (WTO), Separation and Conversion Technologies, Boeretang 200, 2400 Mol, Belgium;

    rnFlemish Institute for Technological Research (WTO), Separation and Conversion Technologies, Boeretang 200, 2400 Mol, Belgium;

  • 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);
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  • 正文语种 eng
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