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首页> 外文期刊>Environmental Science & Technology >Deoxygenation Prevents Arsenic Mobilization during Deepwell Injection into Sulfide-Bearing Aquifers
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Deoxygenation Prevents Arsenic Mobilization during Deepwell Injection into Sulfide-Bearing Aquifers

机译：脱氧可防止深井注入含硫含水层中的砷动员

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摘要

Coal seam gas (CSG) extraction generates large volumes of coproduced water. Injection of the excess water into deep aquifers is often the most sustainable management option. However, such injection risks undesired sediment-water interactions that mobilize metal(loid)s in the receiving aquifer. This risk can be mitigated through pretreatment of the injectant. Here, we conducted a sequence of three push-pull tests (PPTs) where the injectant was pretreated using acid amendment and/or deoxygenation to identify the processes controlling the fate of metal(loid)s and to understand the treatment requirements for large-scale CSG water injection. The injection and recovery cycles were closely monitored, followed by analysis of the observations through reactive transport modeling. While arsenic was mobilized in all three PPTs, significantly lower arsenic concentrations were observed in the recovered water when the injectant was deoxygenated, regardless of pH adjustment. The breakthrough of arsenic was commensurate with molybdenum, but distinct from phosphate. This allowed for the observed and modeled arsenic and molybdenum mobilization to be attributed to a stoichiometric codissolution process during pyrite oxidation, whereas phosphate mobility was governed by sorption. Understanding the nature of these hydrochemical processes explained the greater efficiency of pretreatment by deoxygenation on minimizing metal(loid) mobilization compared to the acid amendment.
机译：煤层气（CSG）提取产生大量的联产水。将过量的水注入深层含水层通常是最可持续的管理选择。但是，这样的注入会冒着不希望有的沉积物-水相互作用，从而动员接收含水层中的金属（胶体）。这种风险可以通过注射剂的预处理来减轻。在这里，我们进行了三个推挽试验（PPT）的序列，其中使用酸修正剂和/或脱氧剂对注射剂进行了预处理，以确定控制金属（金属）命运的过程并了解大规模处理的要求南玻注水。密切监测注入和回收周期，然后通过反应性运输模型分析观察结果。尽管在所有三个PPT中都移动了砷，但无论注入器的pH值如何调节，在注入水脱氧后，回收水中的砷浓度都明显降低。砷的突破与钼相当，但与磷酸盐不同。这使得观察到的和建模的砷和钼的迁移归因于黄铁矿氧化过程中的化学计量共溶解过程，而磷酸盐的迁移率则受吸附控制。理解这些水化学过程的性质可以解释，与酸改性剂相比，通过脱氧进行的预处理在最大程度地减少金属（金属）迁移方面具有更高的效率。

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  • 来源
    《Environmental Science & Technology》 |2018年第23期|13801-13810|共10页
  • 作者

    Prommer Henning; Sun Jing; Helm Lauren; Rathi Bhasker; Siade Adam J.; Morris Ryan;

  • 作者单位

    CSIRO Land & Water, Private Bag 5, Wembley, WA 6913, Australia;

    NCGRT, Adelaide, SA 5001, Australia;

    Univ Western Australia, Sch Earth Sci, 35 Stirling Hwy, Perth, WA 6009, Australia;

    Origin Energy, 180 Ann St, Brisbane, Qld, Australia;

    Univ Tubingen, Ctr Appl Geosci, D-72074 Tubingen, Germany;

  • 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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