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Biochar reversed antibiotic resistance genes spread in biodegradable microplastics and Cu co-contaminated soil by lowering Cu bio-availability and regulating denitrification process
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The effect of bulk-biochar and nano-biochar amendment on the removal of antibiotic resistance genes in microplastic contaminated soil
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Researchers tested whether bulk-biochar and nano-biochar amendments could reduce antibiotic resistance genes in microplastic-contaminated soil. They found that microplastics initially increased the abundance of resistance genes, but both biochar types effectively inhibited their spread regardless of microplastic presence. The study suggests that biochar amendment is a promising strategy for managing antibiotic resistance in soils co-contaminated with microplastics.
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Agricultural soils are increasingly polluted by a troubling combination of heavy metals, microplastics, and antibiotic-resistant bacteria — and this five-year field study found that combining biochar with organic fertilizer significantly reduces all three types of contamination at once. The treatment worked by reshaping soil microbial communities in ways that suppressed antibiotic-resistant organisms while promoting microbes that break down plastics and immobilize metals. This approach offers a practical, field-tested strategy for cleaning up complex pollution in intensively farmed soils.
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This study found that both polypropylene and polystyrene microplastics significantly inhibited copper ion adsorption by a novel beta-cyclodextrin modified biochar in water remediation tests, reducing maximum copper uptake by up to 24% through surface blocking and pore occlusion. The results reveal that co-occurring microplastics can undermine the effectiveness of engineered adsorbents for heavy metal removal, complicating real-world water treatment in contaminated environments where multiple pollutants coexist.
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