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首页> 外文会议>International Conference on Remediation of Chlorinated and Recalcitrant Compounds >Ozone Treatment of PCE DNAPL beneath an Active Packaging Plant
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Ozone Treatment of PCE DNAPL beneath an Active Packaging Plant

机译：臭氧处理PCE DNAPL下面的活性包装厂

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Background/Objectives. A combined remedy consisting of in situ ozone injection and soil vapor extraction (SVE) was implemented to treat a tetrachloroethene (PCE) source area beneath an active packaging plant. Prior to implementation of the combined ozone remedy, two iron-activated persulfate injections and six potassium permanganate injections were performed over a period of 18 months, resulting in short-term decreases in PCE concentrations of 90% or better. Rebound of PCE in groundwater to within 50% of pre-treatment concentrations was observed 2.5 years after the final liquid oxidant injection. A combined ozone and SVE remedy was selected to offer a final remedy and soil sampling was performed during well installations to inform the selection of locations and screen depths for new ozone injection wells. An analysis of soil and groundwater data collected during implementation indicated that a PCE dense nonaqueous-phase liquid (DNAPL) source was present in a fine-grained soil layer slightly above the water table. The ozone injection system was designed to effectively target PCE contamination present above the water table, and the design of the remedy included expansion of the existing injection well network to target a previously untreated source area.
机译：背景/目标。实施了由原位臭氧注射和土壤蒸汽提取（SVE）组成的组合补救措施，以处理活性包装厂下方的四氯乙烯（PCE）源区。在实施合并臭氧补救措施之前，在18个月的时间内进行两次铁活化过硫酸盐注射和六个高锰酸钾注射，导致PCE浓度为90％或更高的短期降低。在最终液体氧化剂注射液后2.5岁，观察到地下水中的PCE在地下水中的倒退到50％以内。选择合并的臭氧和SVE补救措施以提供最终的补救措施，并在井装置中进行土壤采样，以便为新的臭氧喷射井的选择和屏幕深度提供信息。实施过程中收集的土壤和地下水数据分析表明，PCE致密的非水相液（DNAPL）源存在于略微在水位上方的细粒土层中。臭氧注入系统被设计为有效地靶向水位上方的PCE污染，并且补救措施的设计包括现有注入井网络的扩展来瞄准先前未经处理的源区。

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