Current progress in remediation of chlorinated volatile organic compounds: A review

Dai, Chenwei; Zhou, Yaoyu; Peng, Hui; Huang, Shaojian; Qin, Pufeng; Zhang, Jiachao; Yang, Yuan; Luo, Lin; Zhang, Xiaoshan

doi:10.1016/j.jiec.2017.12.049

Cited by 132 publications

(41 citation statements)

References 218 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%

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%

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mitoma¹,

Katayama²,

Simion³

2018

Organochlorine

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“…Only in one case, the presence of halocarbons (namely perchloroethylene) was detected. Conversely, research showed that landfills are well-known sources of halocarbons [30,31].…”

Section: Analysis Of the Possible Sources Of Halocarbonsmentioning

confidence: 99%

Halocarbon Emissions from Hazardous Waste Landfills: Analysis of Sources and Risks

Ravina¹,

Facelli²,

Zanetti³

2020

Atmosphere

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Landfills are sources of fugitive volatile organic carbon (VOC) emissions, including halocarbons. The objective of this study was to evaluate the contribution of halogenated VOCs to the health risks associated with the exposure of workers operating in landfills, gathering information on the role of endogenous/exogenous sources present in anthropized areas. A hazardous waste landfill located in Turin, Italy was used as a case study. Ambient concentrations of 10 pollutants (BTEX, styrene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene, 1,2-dichloroethane, and 1,2-dichloropropane), measured in 10 points of the landfill area, were considered and analyzed. The data had a monthly frequency and covered two years. A cumulative health risk analysis was conducted by applying a Monte-Carlo method. The results showed that the contribution of 1,2-dichloroethane and 1,2-dichloropropane was 17.9% and 19.4% for the total risk and hazard index respectively. Benzene and ethylbenzene gave the highest contribution to the total risk (56.8% and 24.8%, respectively). In the second phase of the study, waste typologies that are possibly responsible for halocarbon emissions were investigated. Halocarbon concentration trends and waste disposal records were compared. Although further investigation is needed, some waste typologies were not excluded to contribute to halocarbon emissions, in particular sludge coming from wastewater treatment plants.

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“…Such fresh electrode materials conquer the hope of encouraging the contribution of diverse oxidizing species, like, ozone and peroxosalts [35] to assist eliminate resistant pathogens. Appropriate residence period among water and the anodes in the electrolyzer, an enough big specific current, and the cathodic production of H 2 O 2 to avoid more oxidation of chlorine to chlorates and perchlorates remain between precautions viewed to bypass such issues [36].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Technology for Wastewater Treatment: Dares and Trends

Ghernaout¹,

Elboughdiri²

2020

OALib

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For treating wastewater, electrochemical engineering has been rediscovered during the last four decades through the world for its inherent advantages comparatively with traditional technologies especially the chemical and biological techniques. However, the expansion of this technology founded on electric current applying has been retarded by several technical-economic factors especially the detection of disinfection by-products (DBPs) formation. This work focuses on the challenges and future tendencies for this highly-efficient technology to reach the full-scale implementations particularly in disinfecting water. Lately, new versions of electrochemical techniques have been suggested such as employing sulfate radical anion ( 4 SO •− ) and sunlight to generate • OH radicals in TiO 2 photocatalysis and photo-Fenton water treatment. These improvements elevated the electrochemical engineering efficiency and acceptation. However, more efforts remain to be accomplished for water reuse vision. Future researches would focus on integrating membranes processes such as nanofiltration and reverse osmosis for a safe removal of DBPs.

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Current progress in remediation of chlorinated volatile organic compounds: A review

Cited by 132 publications

References 218 publications

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

Halocarbon Emissions from Hazardous Waste Landfills: Analysis of Sources and Risks

Electrochemical Technology for Wastewater Treatment: Dares and Trends

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