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首页> 外文会议>Sixth International in Situ and On-Site Bioremediation Symposium, 6th, Jun 4-7, 2001, San Diego, California >IN SITU BIOREMEDIATION OF METALS-CONTAMINATED GROUNDWATER USING SULFATE-REDUCING BACTERIA: A CASE HISTORY
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IN SITU BIOREMEDIATION OF METALS-CONTAMINATED GROUNDWATER USING SULFATE-REDUCING BACTERIA: A CASE HISTORY

机译：硫酸盐还原菌原位生物修复金属污染地下水的案例研究

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摘要

Contamination of groundwater by toxic metals from both natural and anthropogenic sources is a growing problem worldwide. One promising new way to remediate such groundwater is to precipitate the contaminants in situ as solid (mineral) phases. A field-scale experiment was used to demonstrate that indigenous bacteria can be stimulated to remove contaminants by injection of water-soluble nutrients into a shallow contaminated water-table aquifer. Groundwater at the site is under aerobic conditions and contained high levels of lead, cadmium, zinc, copper, and sulfuric acid (pH = 3.1) derived from a car-battery recycling plant. Injected nutrients initiated bacterial sulfate reduction by one principal species (Desulfosporosinus orientis) under these acidic conditions. Lead, cadmium, zinc, and copper were almost completely removed by precipitation of solid sulfide phases as pH increased to 4.1. Geochemical reaction path modeling was used to trace the geochemical evolution of sulfate reduction and sorption processes. The results show that sulfate reduction produced desired geochemical conditions (i.e., low Eh and high pH) for the precipitation of metal sulfides and sorption processes. Results have implications for in situ remediation strategies for other sites where anthropogenic or natural sources of metals contaminate groundwater.
机译：天然和人为来源的有毒金属对地下水的污染在世界范围内都是一个日益严重的问题。补救此类地下水的一种有希望的新方法是将污染物原位沉淀为固相（矿物）相。田间规模的实验被用来证明，通过将水溶性养分注入受污染的浅水层含水层中，可以刺激本地细菌去除污染物。该地点的地下水处于有氧条件下，并且含有大量的铅，镉，锌，铜和硫酸（pH = 3.1）来自汽车电池回收厂。在这些酸性条件下，注入的养分开始使细菌硫酸盐减少一种主要种类（东方脱硫孢子）。随着pH值增加到4.1，固态硫化物相的沉淀几乎完全去除了铅，镉，锌和铜。利用地球化学反应路径模型来追踪硫酸盐还原和吸附过程的地球化学演化。结果表明，硫酸盐还原产生了用于金属硫化物沉淀和吸附过程的所需地球化学条件（即，低Eh和高pH）。结果对其他人为或天然金属污染地下水的场所的原位修复策略具有影响。

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