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首页> 外文会议>AWMA's (Air Waste Management Association) annual conference exhibition >SUCCESSFUL IN-SITU TREATMENT OF CHROMIUM CONTAMINATED GROUNDWATER
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SUCCESSFUL IN-SITU TREATMENT OF CHROMIUM CONTAMINATED GROUNDWATER

机译：铬污染地下水的原位成功处理

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Environmental investigations identified a limited area of groundwater contaminated with hexavalent chromium at a 100-year old former manufacturing facility. Total chromium concentrations in groundwater ranged up to 18.6 milligrams per liter (mg/L), and the concentrations of hexavalent chromium ranged up to 11 mg/L.The former property owner, Navistar, Inc., is seeking a No Further Remediation Letter from the State of Illinois. A Remedial Action Plan, approved by the Illinois Environmental Protection Agency, consisted of the creation of an anaerobic in-situ reactive zone to reduce the hexavalent chromium to immobilized trivalent chromium with a single injection event using a dilute molasses/ferrous sulfate solution.The program included baseline sampling, a direct-push and injection well pilot test, full-scale injection, and post-injection monitoring. The direct-push pilot test consisted of the injection of 2 gallons per minute for each 0.1 feet of rod withdrawn from the ground (200 gallons total). The data indicated that direct-push injection resulted in short-circuiting of the injection fluid at a monitoring well five feet away. Short-circuiting would have prevented adequate distribution of the injection fluid in the full-scale system and would have failed to adequately treat the contaminated groundwater. The 2-inch inside diameter permanent well (5-foot screen) test injection rate was approximately 2.4 gallons per minute (720 gallons total). There were no indications of short-circuiting during the injection well pilot test, and accordingly the permanent well delivery method was selected for full-scale application.Post-injection groundwater sampling results indicated adequate distribution of injection solution, and that conversion to trivalent chromium was achieved in less than two weeks from the injection event. The groundwater remediation objective was successfully achieved within 14 weeks of the single injection event. The chromium concentrations remained below the 1 mg/L remediation objective after six months.
机译：环境调查发现，在拥有100年历史的旧工厂中，有限的地下水被六价铬污染。地下水中的总铬浓度范围高达18.6毫克每升（mg / L），六价铬的浓度范围高达11 mg / L。前财产所有人Navistar，Inc.正在寻求无进一步补救的信伊利诺伊州。伊利诺伊州环境保护局（Illinois Environmental Protection Agency）批准了一项补救行动计划，该行动计划包括建立一个厌氧原位反应区，以单次注入事件使用稀糖蜜/硫酸亚铁溶液将六价铬还原为固定的三价铬。包括基线采样，直推式和注入井先导测试，满量程注入和注入后监控。直推式先导测试包括每从地面抽出0.1英尺的杆每分钟注入2加仑（总计200加仑）。数据表明，直接推注导致5英尺外的监控井处的注入流体短路。短路将阻止注入流体在满量程系统中的充分分配，并且将无法充分处理受污染的地下水。 2英寸内径永久井（5英尺滤网）的测试注入速率约为每分钟2.4加仑（总计720加仑）。在注入井中试过程中没有出现短路的迹象，因此选择了永久性井输送方法进行全面应用。注入后的地下水采样结果表明注入溶液分布充分，并且转化为三价铬从注射事件开始不到两周就达到了目标。在单次注入事件的14周内成功实现了地下水修复目标。六个月后，铬浓度仍低于1 mg / L的修复目标。

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