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Combined use of ISCR and biostimulation techniques in incomplete processes of reductive dehalogenation of chlorinated solvents
Science of the Total Environment ( IF 9.8 ) Pub Date : 2018-08-18 , DOI: 10.1016/j.scitotenv.2018.08.184
Jofre Herrero , Diana Puigserver , Ivonne Nijenhuis , Kevin Kuntze , José M. Carmona

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.



中文翻译:

在不完全的氯化溶剂还原脱卤过程中,结合使用ISCR和生物刺激技术

与含水层中其他地方相比,在含水层和基层含水层之间的过渡带中,氯乙烯池更难分解。尽管在该区域发生了氯乙烯的生物降解,但这是一个缓慢的过程,需要采取补救措施。这项研究的目的是证明生物刺激和原位化学还原(ISCR)的组合策略比两种单独的策略更有效。在i)自然条件下,ii)乳酸生物刺激下,iii)原位设计了四个不同的微观实验,这些实验是利用选定的田地的沉积物和地下水进行的,该田地位于过渡区的底部有一个老化的全氯乙烯(PCE)池。零价铁(ZVI)进行化学还原(ISCR),在iv)下采用乳酸和ZVI的联合策略。生物和非生物脱卤,对于每个实验,研究了末端电子受体过程和微生物群落的演变。主要结果如下:i)在硫酸盐还原条件下,PCE的还原还原脱卤作用有限;ii)在自然条件下,乳酸的生物刺激与PCE相比,可促进PCE的还原性脱卤作用更明显,但会导致PCE的积累。顺式-二氯乙烯(cDCE); iii)具有零价铁(ZVI)的ISCR促进了PCE及其代谢物持续脱卤为非卤代产品,但是,iv)组合策略可将PCE最快且持续地脱卤为非卤代产品。所有四个设置。这些发现表明,ZVI的生物刺激和ISCR是过渡区PCE池完全还原脱卤的最合适策略。

更新日期:2018-08-21
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