Microbial and enzymatic degradation of PCBs from e-waste-contaminated sites: a review

Khalid, Foqia; Hashmi, Muhammad Zaffar; Jamil, Nadia; Qadir, Abdul; Ali, Muhammad Ishtiaq

doi:10.1007/s11356-020-11996-2

Cited by 47 publications

(18 citation statements)

References 121 publications

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“…To our knowledge, the true PCB dechlorination potential was difficult to predict due to the lack of monitored long-term dechlorination data. Most laboratory PCB dechlorination studies lasted for less than 12 months (see reviews in refs , and ). The longest dechlorination experimental study was conducted by Sokol and colleagues .…”

Section: Introductionmentioning

confidence: 99%

Long-Term Dechlorination of Polychlorinated Biphenyls (PCBs) in Taihu Lake Sediment Microcosms: Identification of New Pathways, PCB-Driven Shifts of Microbial Communities, and Insights into Dechlorination Potential

Tang

et al. 2021

Environ. Sci. Technol.

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Microbial reductive dechlorination of polychlorinated biphenyls (PCBs) is regarded as an alternative approach for in situ remediation and detoxification in the environment. To better understand the process of PCB dechlorination in freshwater lake sediment, a long-term (108 weeks) dechlorination study was performed in Taihu Lake sediment microcosms with nine parent PCB congeners (PCB5, 12, 64, 71, 105, 114, 149, 153, and 170). Within 108 weeks, the total PCBs declined by 32.8%, while parent PCBs declined by 84.8%. PCB dechlorinators preferred to attack meta- and para-chlorines, principally para-flanked meta and single-flanked para chlorines. A total of 58 dechlorination pathways were observed, and 20 of them were not in 8 processes, suggesting the broad spectrum of PCB dechlorination in the environment. Rare ortho dechlorination was confirmed to target the unflanked ortho chlorine, indicating a potential for complete dechlorination. PCBs drove the shifts of the microbial community structures, and putative dechlorinating bacteria were growth-linked to PCB dechlorination. The distinct jump of RDase genes ardA, rdh12, pcbA4, and pcbA5 was found to be consistent with the commencement of dechlorination. The maintained high level of putative dechlorinating phylum Chloroflexi (including Dehalococcoides and o-17/DF-1), genus Dehalococcoides, and four RDase genes at the end of incubation revealed the long-term dechlorination potential. This work provided insights into dechlorination potential for long-term remediation strategies at PCB-contaminated sites.

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Section: Introductionmentioning

confidence: 99%

Long-Term Dechlorination of Polychlorinated Biphenyls (PCBs) in Taihu Lake Sediment Microcosms: Identification of New Pathways, PCB-Driven Shifts of Microbial Communities, and Insights into Dechlorination Potential

Tang

et al. 2021

Environ. Sci. Technol.

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“…Bioremediation is the process of using microorganisms such as bacteria, algae, fungi, and plants to break down, change, remove, immobilize, or detoxify various physical and chemical pollutants in the environment. Microorganisms' enzymatic metabolic pathways speed up biochemical reactions that break down pollutants [25,26]. In order for microorganisms to combat pollutants, they must come into contact with compounds that provide them with the energy and nutrients they need to multiply.…”

Section: Factors Affecting Microbial Bioremediationmentioning

confidence: 99%

Recent Strategies for Bioremediation of Emerging Pollutants: A Review for a Green and Sustainable Environment

Bala

Garg

Thirumalesh

et al. 2022

Toxics

223

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Environmental pollution brought on by xenobiotics and other related recalcitrant compounds have recently been identified as a major risk to both human health and the natural environment. Due to their toxicity and non-biodegradability, a wide range of pollutants, such as heavy metals, polychlorinated biphenyls, plastics, and various agrochemicals are present in the environment. Bioremediation is an effective cleaning technique for removing toxic waste from polluted environments that is gaining popularity. Various microorganisms, including aerobes and anaerobes, are used in bioremediation to treat contaminated sites. Microorganisms play a major role in bioremediation, given that it is a process in which hazardous wastes and pollutants are eliminated, degraded, detoxified, and immobilized. Pollutants are degraded and converted to less toxic forms, which is a primary goal of bioremediation. Ex situ or in situ bioremediation can be used, depending on a variety of factors, such as cost, pollutant types, and concentration. As a result, a suitable bioremediation method has been chosen. This review focuses on the most recent developments in bioremediation techniques, how microorganisms break down different pollutants, and what the future holds for bioremediation in order to reduce the amount of pollution in the world.

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“…6 However, in spite of their chemical stability, several microorganisms are described in the literature with a potential to biotransform or mineralize the PCBs aerobically or anaerobically. 7 Aerobic oxidation and anaerobic dechlorination are the best known biodegradation pathways of PCBs. 8,9 Pollution with POPs can lead to disorder of the reproductive, immune, endocrine and the nervous system, as well as to carcinogenesis, mutagenesis and teratogenesis.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Bioremediation of river sediment polluted with polychlorinated biphenyls: A laboratory study

Zeradjanin

Joksimović

Avdalović

et al. 2022

JSCS

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Persistent organic pollutants (POPs) are lipophilic, persistent and bioaccumulative toxic compounds. In general, they are considered resistant to biological, photolytic, and chemical degradation and polychlorinated biphenyls (PCBs) belong to these chemicals. PCBs were never produced in Serbia, but they were imported and mainly used in electrical equipment, transformers, and capacitors. Our study aimed to analyse sequential multi-stage aerobic/anaerobic microbial biodegradation of PCBs present in the river sediment from an area known for long-term pollution with these chemicals. A study with an autochthonous natural microbial community (NMC model system) and NMC augmented with allochthonous hydrocarbon-degrading (AHD) microorganisms (isolated from location contaminated with petroleum products) (NMC-AHD model system) was performed in order to estimate the potential of these microorganisms for possible use in future bioremediation treatment of these sites. The laboratory biodegradation study lasted 70 days, after which an overall >33 % reduction in the concentration of total PCBs was observed. This study confirmed the strong potential of the NMC for the reduction of the level of PCBs in the river sediment under alternating multi-stage aerobic/anaerobic conditions.

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Microbial and enzymatic degradation of PCBs from e-waste-contaminated sites: a review

Cited by 47 publications

References 121 publications

Long-Term Dechlorination of Polychlorinated Biphenyls (PCBs) in Taihu Lake Sediment Microcosms: Identification of New Pathways, PCB-Driven Shifts of Microbial Communities, and Insights into Dechlorination Potential

Long-Term Dechlorination of Polychlorinated Biphenyls (PCBs) in Taihu Lake Sediment Microcosms: Identification of New Pathways, PCB-Driven Shifts of Microbial Communities, and Insights into Dechlorination Potential

Recent Strategies for Bioremediation of Emerging Pollutants: A Review for a Green and Sustainable Environment

Bioremediation of river sediment polluted with polychlorinated biphenyls: A laboratory study

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