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首页> 外文会议>International Conference on Remediation of Chlorinated and Recalcitrant Compounds >Vapor Intrusion Concerns after an In Situ Chemical Reduction Approach
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Vapor Intrusion Concerns after an In Situ Chemical Reduction Approach

机译：蒸气侵入后涉及原位化学还原方法

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Background/Objectives. Groundwater at an industrial property located in a residential neighborhood in Sao Paulo, Brazil was impacted by chlorinated solvents at concentrations of 30 mg/L PCE and TCE, 190 mg/L of cis-1,2-DCE and 30 mg/L of VC; all of which are above the Brazilian regulatory standards. Lower dissolved concentrations of these compounds were also detected in groundwater at the neighboring residential area, with VC significantly above regulatory standards. The concentrations of solvents in the vapor under a slab were above EPA Industrial Guideline Values, particularly in the source area. To address these impacts, the remedial solution involved injection of EHC throughout the source area to promote in situ chemical reduction (ISCR) of chlorinated solvents in the saturated soil and groundwater. The EHC was also applied to lines of injection points to create reactive barriers at the down gradient plume area, which extended below a residential condominium. As part of the evaluation of the remedial approach, monitoring of soil vapors below the subslabs was performed at both the industrial (source) and residential (plume) areas to ensure that human receptors would not be exposed to solvent vapor intrusion. While the EHC injections were successful at reducing groundwater concentrations at the source and plume area, subslab vapor were not reduced in a timely manner at either location. Therefore, a soil vapor extraction (SVE) system was installed at the source zone as a contingency plan to prevent migration of vapors into the residences.
机译：背景/目标。巴西位于圣保罗的住宅附近的地下水，巴西受氯化溶剂的浓度为30mg / l pce，190 mg / L的CIS-1,2-DCE和30毫克/升VC的影响;所有这些都高于巴西监管标准。在相邻住宅区的地下水中也检测到较低的溶解浓度，在地下水中，具有显着高于监管标准的VC。板块下蒸汽中溶剂的浓度高于EPA工业指南值，特别是在源区。为了解决这些影响，补救解决方案涉及在整个源区注射EHC，以促进饱和土壤和地下水中的氯化溶剂的原位化学还原（ISCR）。 EHC还应用于注射点的线，以在下梯度羽流区域中产生反应性屏障，其在居住公寓下方延伸。作为对补救方法评估的一部分，在工业（来源）和住宅（羽流）和住宅区进行亚拉峰下方的土壤蒸气监测，以确保人受体不会暴露于溶剂蒸汽侵入。虽然EHC喷射在源和羽流区域的降低地下水浓度下成功，但是，在任一位置时，亚拉比蒸气不会及时降低。因此，在源区安装土壤蒸汽提取（SVE）系统作为应急计划，以防止蒸汽迁移到居住区中。

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