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Enhancing the oxidation of polystyrene through a homogeneous liquid degradation system for effective microbial degradation
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Researchers compared how well microorganisms can break down polystyrene plastic in solid versus liquid form. They found that dissolving polystyrene into a liquid state significantly increased the rate of microbial degradation by making the plastic more accessible to bacteria. The study suggests that converting solid plastic waste into liquid form before biological treatment could be a more effective approach to plastic cleanup.
Plastics play a crucial role in modern industries; however, their resistance to natural degradation contributes to environmental pollution, and microplastics pose a health threat. The hydrophobic nature of microplastics poses a considerable challenge, rendering them resistant to dissolving in water. In this study, we conducted a comparative analysis of the microbial biodegradation capabilities of polystyrene in solid and liquid states. Polystyrene in its solid foam form, along with polystyrene converted into a liquid state using ethyl-ester oil, was biodegraded by microorganisms. Subsequently, the liquid plastic was re-extracted into its solid form, and the degree of degradation was assessed using weight loss measurement, XPS, FT-IR, GPC, and TGA. Liquid-state polystyrene exhibited a higher degradation rate than that reported previously. Furthermore, liquid polystyrene undergoes more pronounced oxidation than its solid counterpart, leading to an increased oxygen atom ratio. Chemical structure analysis highlighted the distinct formation of -OH and C=O functional groups in the liquid state compared to those in the solid state. Additionally, notable changes in the molecular weight and thermal stability of polystyrene were observed during biodegradation in the liquid state. This study suggests that a heterogeneous reaction (solid plastic-liquid medium) might impede plastic biodegradation, while indicating the potential to enhance the degradation efficiency through a homogeneous reaction (liquid plastic-liquid medium). The follow-up study identifies appropriate solvents and optimizes cultivation conditions, offering potential to enhance the efficiency of biological plastic degradation.
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The Biodegradation of Polystyrene by Soil Bacteria
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Researchers investigated whether soil bacteria could biodegrade polystyrene, a plastic historically considered highly resistant to natural degradation since studies dating to the 1970s first examined its environmental persistence. They found evidence that certain soil bacterial communities can break down polystyrene, suggesting a potential biological pathway for remediating this persistent plastic pollutant in terrestrial and marine environments.
A novel bacterial combination for efficient degradation of polystyrene microplastics
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Researchers tested three bacterial species, alone and in combinations, for their ability to break down polystyrene microplastics used as the sole food source. The combination of Stenotrophomonas maltophilia and Bacillus velezensis achieved the most impressive results, degrading 43.5 percent of the polystyrene in 60 days. The study suggests that carefully selected bacterial partnerships, rather than single species, may be more effective for biological degradation of plastic waste.
Enrichment of native plastic‐associated biofilm communities to enhance polyester degrading activity
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Researchers found that expanded polystyrene promotes high levels of bacterial biofilm formation and demonstrated that native plastic-associated microbial communities from environmental waste can be enriched to enhance polyester-degrading activity, offering potential for biological plastic remediation.
Comparative Analysis of Electrochemical Oxidation and Biodegradation for Microplastic Removal in Wastewater
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Researchers compared electrochemical oxidation and biodegradation for removing polystyrene microplastics from wastewater, finding that electrochemical oxidation achieved superior removal efficiency and could serve as a more effective treatment pathway at wastewater treatment plants.
Polystyrene Microplastics Degradation by Microbial Consortium From Jakarta Bay
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Researchers isolated microbial consortia from Jakarta Bay that demonstrated the ability to degrade polystyrene microplastics. The bacterial communities, sourced from biofilm-covered plastic waste in the bay, showed measurable degradation of polystyrene over the study period. The findings suggest that naturally occurring marine microorganisms in polluted environments may have evolved capabilities that could be harnessed for bioremediation of plastic waste.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.