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首页> 外文期刊>The Science of the Total Environment >Combined use of ISCR and biostimulation techniques in incomplete processes of reductive dehalogenation of chlorinated solvents
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Combined use of ISCR and biostimulation techniques in incomplete processes of reductive dehalogenation of chlorinated solvents

机译：在氯化溶剂的还原脱卤过程中的不完全过程中结合ISCR和生物刺激技术的结合

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Pools of chloroethenes are more recalcitrant in the transition zone between aquifers and basal aquitards than those elsewhere in the aquifer. Although biodegradation of chloroethenes occur in this zone, it is a slow process and a remediation strategy is needed. The aim of this study was to demonstrate that combined strategy of biostimulation and in situ chemical reduction (ISCR) is more efficient than the two separated strategies. Four different microcosm experiments with sediment and groundwater of a selected field site where an aged perchloroethene (PCE)-pool exists at the bottom of a transition zone, were designed under i) natural conditions, ii) biostimulation with lactic acid, iii) in situ chemical reduction (ISCR) with zero valent iron (ZVI) and under iv) a combined strategy with lactic acid and ZVI. Biotic and abiotic dehalogenation, terminal electron acceptor processes and evolution of microbial communities were investigated for each experiment. The main results where: i) limited reductive dehalogenation of PCE occurs under sulfate-reducing conditions; ii) biostimulation with lactic acid promotes a more pronounced reductive dehalogenation of PCE in comparison under natural conditions, but resulted in an accumulation of cis-dichloroethene (cDCE); iii) ISCR with zero-valent iron (ZVI) facilitates a sustained dehalogenation of PCE and its metabolites to non-halogenated products, however, the iv) combined strategy results in the fastest and sustained dehalogenation of PCE to non-halogenated products in comparison of all four set-ups.These findings suggest that biostimulation and ISCR with ZVI are the most suitable strategy for a complete reductive dehalogenation of PCE-pools in the transition zone. (C) 2018 Elsevier B.V. All rights reserved.
机译：氯乙烯池在含水层和基底潜水器之间的过渡区比其他地方的过渡区更顽固。尽管在该区域发生了氯乙烯的生物降解，但它是一种缓慢的过程，需要进行修复策略。本研究的目的是证明了生物刺激和原位化学还原（ISCR）的组合策略比两种分离的策略更有效。四种不同的微观微观实验，具有沉积物和地下水的选定现场的沉积物和地下水，在过渡带的底部存在着老化的全氯乙烯（PCE） - 泊，在I）天然条件下设计，II）与乳酸，iii）原位生物刺激用零价铁（ZVI）和IV下的化学还原（ISCR）和IV下的乳酸和ZVI的组合策略。对每个实验研究了生物和非生物脱离，末端电子受体方法和微生物群落的演化。主要结果：i）在硫酸盐降低条件下，PCE的有限还原脱卤素发生; ii）在自然条件下，乳酸的生物刺激促进了PCE更明显的PCE的还原脱卤，但导致CIS-二氯乙烯（CDCE）的积累; III）具有零价铁（ZVI）的ISCR促进了PCE及其代谢物对非卤化产品的持续脱卤，然而，IV）组合策略导致PCE对非卤化产品的最快和持续的脱离脱卤，相比之下所有四个设置。这些研究结果表明，与ZVI的生物刺激和ISCR是过渡带中PCE池完全还原脱离的最合适的策略。 （c）2018年elestvier b.v.保留所有权利。

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