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首页> 外文期刊>Environmental Science & Technology >Pilot-Scale Demonstration of Surfactant-Enhanced PCE Solubilization at the Bachman Road Site: 2. System Operation and Evaluation
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Pilot-Scale Demonstration of Surfactant-Enhanced PCE Solubilization at the Bachman Road Site: 2. System Operation and Evaluation

机译：在巴赫曼路现场进行的表面活性剂增强的PCE增溶的中试演示：2.系统运行和评估

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A pilot-scale demonstration of surfactant-enhanced aquifer remediation (SEAR) was conducted during the summer of 2000 at the Bachman Road site in Oscoda, MI. Part two of this two-part paper describes results from partitioning and nonpartitioning tracer tests, SEAR operations, and post-treatment monitoring. For this field test, 68 400 L of an aqueous solution of 6% (wt) Tween 80 were injected to recover tetrachloroethene-nonaqueous phase liquid (PCE-DNAPL) from a shallow, unconfined aquifer. Results of a nonreactive tracer test, conducted prior to introducing the surfactant solution, demonstrate target zone sweep and hydraulic control, confirming design-phase model predictions. Partitioning tracer test results suggest PCE-DNAPL saturations of up to 0.74% within the pilot-scale treatment zone, consistent with soil core data collected during site characterization. Analyses of effluent samples taken from the extraction well during SEAR operations indicate that a total of 19 L of PCE and 95% of the injected surfactant were recovered. Post-treatment monitoring indicated that PCE concentrations at many locations within the treated zone were reduced by as much as 2 orders of magnitude from pre-SEAR levels and had not rebounded 450 days after SEAR operations ceased. Pilot-scale costs (USD365 900) compare favorably with design-phase cost estimates, with ～10% of total costs attributable to the intense sampling density and frequency. Results of this pilot-scale test indicate that careful design and implementation of SEAR can result in effective DNAPL mass removal and a substantial reduction in aqueous concentrations within the treated source zone under favorable geologic conditions.
机译：2000年夏季，在密歇根州Oscoda的巴赫曼路工地进行了表面活性剂增强的含水层修复（SEAR）的中试规模的演示。这个由两部分组成的论文的第二部分描述了分区和非分区跟踪器测试，SEAR操作以及后处理监视的结果。对于该现场测试，注入了68400 L的6％（wt）Tween 80水溶液，以从浅的无侧限含水层中回收四氯乙烯-非水相液体（PCE-DNAPL）。在引入表面活性剂溶液之前进行的非反应示踪剂测试的结果证明了目标区域的扫掠和水力控制，证实了设计阶段模型的预测。分区示踪剂测试结果表明，中试规模处理区内PCE-DNAPL的饱和度高达0.74％，这与现场表征期间收集的土壤核心数据一致。在SEAR操作期间从萃取井中抽取的废水样品的分析表明，总共回收了19 L PCE和95％注入的表面活性剂。处理后的监测表明，处理过的区域内许多位置的PCE浓度比SEAR之前的水平降低了2个数量级，并且在SEAR操作停止后450天没有反弹。试点成本（365,900美元）与设计阶段的成本估算相比具有优势，总成本的约10％归因于密集的采样密度和频率。该中试测试的结果表明，在有利的地质条件下，精心设计和实施SEAR可以有效去除DNAPL物质，并显着降低处理后源区内的水浓度。

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