Low-levels of mercury are present in the influent and effluent of a groundwater pump & treat treatment system that was installed to remediate volatile organic compounds (VOCs). Total mercury in the groundwater is on the order of 250 ng/L, which exceeds a recently promulgated limit of 51 ng/L for the receiving out- fall. A system that coupled chemical treatment with the existing air-stripping equipment was developed, tested, and deployed to cost-effectively treat the mercury. This system is based on transforming the mercury into a strippable elemental form using small amounts of stannous chloride. The necessary equipment was straightforward to implement and operate and demonstrated the ability to meet the mercury discharge limit. The process removes almost 95% of the mercury via the combination of chemical reduction and air stripping. Initial capital costs for the system are less than $5000 and the increase in operating costs are $0.17 per thousand gallons.
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机译：在安装以修复挥发性有机化合物（VOC）的地下水泵和治疗系统的流动和流出物中存在低水平的汞。地下水中的总汞约为250 ng / l，超过最近颁布的51 ng / l的限制。开发，经过开发，测试，并展开了一种耦合现有汽提设备的化学处理的系统，以成本有效地治疗汞。该系统基于使用少量氯化锡将汞转化为可剥离的元素形式。必要的设备很简单地实施和运营，并证明了满足汞排放限制的能力。该过程通过化学减少和空气剥离的组合去除近95％的汞。该系统的初始资本成本低于5000美元，运营成本的增加为0.17万美元。
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