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Microplastics Enhance the Denitrification of Glycogen-Accumulating Organisms by Regulating Electronic Transport in Carbon-Nitrogen Coupling
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Microplastics enhance the denitrification of glycogen-accumulating organisms by regulating electronic transport in carbon-nitrogen coupling
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Researchers investigated how different sizes of PVC microplastics affect the denitrification process carried out by glycogen-accumulating organisms in wastewater treatment systems. They found that larger 100-micrometer particles enhanced denitrification efficiency by 14.6% by promoting carbon metabolism and electron transport, while smaller 100-nanometer particles inhibited the process by 8.4%. The study reveals a novel mechanism by which microplastic particle size regulates carbon-nitrogen coupling in activated sludge.
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Tiny plastic fibers in soil can mess with the helpful bacteria that plants rely on to pull nitrogen from the air, a process crucial for healthy growth, but the effects depend on the type of plastic, with some helping and others hurting root growth or the bacterial partnerships plants need. This matters because as plastic pollution builds up in farmland, it could quietly disrupt the natural systems that keep our food crops fed and healthy, even before we fully understand the ripple effects on the food we eat.
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Researchers exposed mangrove rhizosphere microbial communities to four types of microplastics in microcosm experiments and found that polyamide and PVC microplastics reduced microbial utilization of preferred carbon sources by up to 67%, while polyethylene exposure altered nitrogen-containing carbon metabolism. These disruptions to carbon and nitrogen cycling raise concerns about microplastics impairing the critical carbon sequestration function of mangrove ecosystems.
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