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Presence of Micro- and Nanoplastics Affects Degradation of Chlorinated Solvents
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Microplastics and nanoplastics don't just sit inertly in the environment — they can interfere with the microbes that clean up other pollutants. This study found that polyamide 6 (PA6) plastic particles disrupted the bacteria responsible for breaking down a common industrial solvent (TCE), causing a harmful intermediate chemical to accumulate instead of being fully destroyed. The findings suggest that plastic pollution could inadvertently undermine bioremediation efforts, the very microbial processes relied upon to clean up contaminated sites.
Microplastics (MPs) and nanoplastics (NPs) can affect microbial abundance and activity, likely by damaging cell membrane components. While their effects on anaerobic digestion are known, less is understood about their impact on microbes involved in contaminant bioremediation. Chlorinated volatile organic contaminants (CVOCs) such as tetrachloroethene (PCE) and explosives like hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) are common in the environment, and their bioremediation is a promising cleanup strategy. This study examined how polystyrene (PS) and polyamide 6 (PA6) MPs and NPs influence CVOC and RDX biodegradation. PS particles did not inhibit the CVOC-degrading community SDC-9, but PA6 MPs impaired the reductive dechlorination of trichloroethene (TCE) to cis-1,2-dichloroethene (cis-DCE), causing a "cis-DCE stall" with no further conversion to vinyl chloride (VC) or ethene. Only 45% of TCE was dechlorinated to cis-DCE, and Dehalococcoides mccartyi abundance dropped 1000-fold in 35 days with PA6 MPs. In contrast, neither PA6 nor PS MPs and NPs affected RDX biotransformation. These results highlight the significant impact of PA6 MPs on CVOC biodegradation and the need to consider plastic pollution in environmental management.
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Researchers found that microplastics inhibited microbial anaerobic dechlorination of polychlorinated biphenyls (Aroclor 1260), with polyethylene causing the greatest inhibition at nearly 40%, suggesting microplastics may impede natural bioremediation of PCB-contaminated environments.
Mechanistic and microbial ecological insights into the impacts of micro- and nano- plastics on microbial reductive dehalogenation of organohalide pollutants
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Researchers found that microplastics generally enhanced microbial reductive dehalogenation of organohalide pollutants by 10-217%, while nanoplastics consistently inhibited it by increasing reactive oxygen species, revealing size-dependent effects on pollutant biotransformation in contaminated environments.
Size-dependent influences of nanoplastics on microbial consortium differentially inhibiting 2, 4-dichlorophenol biodegradation
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Researchers investigated how different sizes of polystyrene nanoplastics affect microbial communities responsible for breaking down the pollutant 2,4-dichlorophenol in wastewater. They found that smaller nanoplastics caused greater disruption to the microbial consortium, significantly reducing its ability to biodegrade the chemical contaminant. The study suggests that nanoplastic pollution in wastewater systems could interfere with the natural biological processes used to clean up other pollutants.
Challenges and opportunities in bioremediation of micro-nano plastics: A review.
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This review examines biological approaches to removing micro- and nanoplastics from the environment, focusing on microbial degradation and bioremediation strategies. While bioremediation holds promise, challenges remain in identifying microbes capable of degrading common plastic types and scaling these processes for practical environmental cleanup.
[Effects of PES and 2,4-DCP on the Extracellular Polymeric Substances and Microbial Community of Anaerobic Granular Sludge].
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Researchers found that polyether sulfone microplastics combined with the industrial contaminant 2,4-dichlorophenol disrupted microbial communities in anaerobic granular sludge used in wastewater treatment, reducing organic matter removal efficiency. The combined exposure caused greater disruption than either pollutant alone, highlighting interaction effects between microplastics and co-occurring chemicals.
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