Review of chemical and electrokinetic remediation of PCBs contaminated soils and sediments

Fan, Guangping; Wang, Yu; Fang, Guodong; Zhu, Xiangdong; Zhou, Dongmei

doi:10.1039/c6em00320f

Cited by 41 publications

(10 citation statements)

References 199 publications

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“…As a result, numerous techniques and procedures were implemented for their destruction/ degradation [6][7][8][9][10][11]. Initially, these procedures focused on the separation/extraction of polychlorinated compounds and subsequent treatment.…”

Section: Introductionmentioning

confidence: 99%

“…But as it was soon discovered, these procedures were in fact a source for a de novo polychlorinated compound synthesis, the process by which dioxins are re-formed being investigated in the recent years [17][18][19]. Therefore, greater attention was focused on more chemical-based processes [6,10,[20][21][22][23], along with microbial ones [24].…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mitoma¹,

Katayama²,

Simion³

2018

Organochlorine

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Defunctionalization of organochlorines through reductive dechlorination (also known as hydrodechlorination-replacement of chlorine atoms by hydrogen-is one of the main methodologies used in the detoxification of these harmful compounds. Most of the published papers on this particular matter focused on specific reagents, reaction conditions, and mainly result efficiency. Some of the authors were also concerned with reaction pathways (e.g., the order in which chlorine atoms were removed from a polychlorinated aromatic substrate-polychlorinated biphenyls, PCBs; polychlorinated dibenzo-p-dioxins, PCDDs; or polychlorinated dibenzofurans, PCDFs). However, the papers that dealt with the investigation of reaction mechanism were rather scarce. This chapter presents the advances made by researchers in understanding, from a mechanistic point of view, the hydrodechlorination process, along with our own assumptions. In doing so, it would be easier to predict the behavior of such compounds in a specific environment, showing more clearly the scope and limitations of each process, depending on the reaction conditions and reagents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mitoma¹,

Katayama²,

Simion³

2018

Organochlorine

View full text Add to dashboard Cite

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“…ultrasonic assisted technology, UV-visible light, microwave, weak magnetic field) (Guan et al 2015), the combination of nZVI particles with foam and electromagnetic induction as an alternative to ratio frequency heating (RFH) (Srirattana et al 2017), advanced oxidation processes, e.g. modified Fenton process or ZVI-activated persulfate (Al-Shamsi and Thomson 2013;Fu et al 2014a;Rybnikova et al 2016), electrokinetic remediation (Fan et al 2016d;Lima et al 2017;Xiong et al 2018) or the combination of ZVI with sulfite (Xie et al 2017a) or with phytoremediation (Gong et al 2018).…”

Section: Combination Of Iron-based Particles With Other Techniquesmentioning

confidence: 99%

In Situ Chemical Reduction of Chlorinated Organic Compounds

Rodrigues

Betelu

Colombano

et al. 2020

Applied Environmental Science and Engineering for a Sustainable Future

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Chlorinated organic compounds (COCs) are common anthropogenic contaminants of soil and groundwater. COCs were industrially produced for different applications, such as dry cleaning, degreasing, or as pesticides. The presence of COCs in the environment is a major concern because of their toxicity and persistence.The most widely used method for their remediation is the conventional pump-and-treat system. However, this technology can hardly achieve a complete remediation because of geological characteristics and the presence of pore space pollution/adsorbed pollution, leading to a residual saturation. Hence, in addition to the improvement of pump-and-treat systems, in situ chemical processes have been largely developed. These chemical processes involve the injection of chemical reagents for the removal of residual source pollution and/or the treatment of plume contamination. Chemical degradation of COCs can be achieved by oxidative or reductive processes. If chemical oxidation has been first developed for in situ application, chemical reduction is one of the most important emerging remediation techniques for COCs treatment. Due to the electronegative character of chlorine substituents, COCs can effectively be transformed via reductive pathways. Moreover, reductive dechlorination has shown higher efficiency on highly chlorinated compounds. This chapter focuses on the presentation of the chemical reduction of the most common COCs pollutants, followed by kinetic and mechanistic approaches related to the use of iron-based particles. Developments on in situ chemical reduction technologies in order to enhance remediation rates are also exposed. Influence of environmental conditions for in situ applications is then developed. Finally, a case study is presented.

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“…Although their production and usage were banned in the late 1970s, increasing attention has been paid to the elimination of PCBs because of their high persistence, bioaccumulation and toxicity linked to diseases of the immune, reproductive, nervous and endocrine systems (Fan et al . 2016; Agulló et al . 2019).…”

Section: Introductionmentioning

confidence: 99%

Comparative study of single cultures and a consortium of white rot fungi for polychlorinated biphenyls treatment

et al. 2021

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Aims To evaluate the mycoremediation of polychlorinated biphenyls (PCBs) by either single cultures or binary consortia of Pleurotus pulmonarius LBM 105 and Trametes sanguinea LBM 023. Methods and Results PCBs tolerance, removal capacity, toxicity reduction and ligninolytic enzyme expression were assessed when growing single culture and binary consortium of fungus in 217 mg l−1 of a technical mixture of Aroclor 1242, 1254 and 1260 in transformer oil. A decrease in tolerance and variation in ligninolytic enzyme secretion were observed in PCB‐amended solid media. Pleurotus pulmonarius LBM 105 mono‐culture was able to remove up to 95·4% of PCBs, whereas binary consortium and T. sanguinea LBM 023 could biodegrade about 55% after 24 days. Significant detoxification levels were detected in all treatments by biosorption mechanism. Conclusions Pleurotus pulmonarius LBM 105 in single culture had the best performance regarding PCBs biodegradation and toxicity reduction. Ligninolytic enzyme secretion changed in co‐culture. Significance and Impact of the Study The evaluation of PCBs bioremediation effectiveness of basidiomycetes consortium in terms of PCB removal, toxicity and ligninolytic enzyme production to unravel the differences between using individual cultures or consortium has not been reported. The results from this study enable the selection of P. pulmonarius LBM 105 mono‐culture to bioremediate PCBs as it showed higher efficiency compared to binary consortium with T. sanguinea LBM 023 for potential decontamination of PCB‐contaminated transformer oil.

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Review of chemical and electrokinetic remediation of PCBs contaminated soils and sediments

Cited by 41 publications

References 199 publications

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

In Situ Chemical Reduction of Chlorinated Organic Compounds

Comparative study of single cultures and a consortium of white rot fungi for polychlorinated biphenyls treatment

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