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Enhanced microbial degradation of PET and PS microplastics under natural conditions in mangrove environment
Summary
Researchers isolated bacteria from microplastic-contaminated mangrove soil and tested their ability to break down PET and polystyrene microplastics under natural conditions. Over 90 days, the microbial consortium achieved an 18% weight loss in the treated microplastics and visibly altered their surface structure. The study suggests that naturally occurring bacteria in polluted environments hold potential for bioremediation of microplastic-contaminated soils.
In-situ bioremediation of mangrove soil contaminated with polyethylene terephthalate (PET) and polystyrene (PS) microplastics was investigated using indigenous microbial consortium with adequate capacity to degrade the plastics. Eight (8) bacteria were isolated from plastic/microplastic-inundated mangrove soil and screened for the ability to degrade PET and PS microplastics. Optical density at 600 nm and colony forming unit counts were measured to evaluate the growth response of the microbes in the presence of PS and PET microplastics at different times of exposure. Structural and surface changes that occurred post biodegradation on the microplastics were determined through EDS and SEM analysis. The obtained results demonstrated the elongation and disappearance of peaks, suggesting that the microbial consortium could modify both types of microplastics. The overall results of the microplastic degradation showed varied degrees of weight loss after 90 experimental days, with the treated plot recorded 18% weight loss. The augmented soil was increased in the concentrations of Si S, and Fe and decreased in the concentrations of C, O, Na, Mg, Al, Cl, and K after bioremediation.
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