Spatiotemporal distribution, driving factors, and ecological risks of antibiotics in the wastewater of urban-scale sewers.
Meng F, Cheng J, Wang Z, Wang C, Jiang J
Urban Ecology
Sewage sludge is widely applied to agricultural fields as fertilizer, meaning the antibiotic residues tracked in this study can end up in the soil your vegetables grow in, potentially disrupting soil microbes that plants depend on for nutrient uptake.
Scientists tested water throughout city sewer pipes to figure out where antibiotic pollution comes from and how much there is at different times of year. They found that antibiotics used on farm animals are showing up in city sewers — likely because people eat meat and the antibiotic residues pass through into waste. One common antibiotic, Ofloxacin, was at levels high enough to potentially harm aquatic life near hospital drains.
Key Findings
Shared human-and-veterinary antibiotics averaged 378 ng/L in sewer water, roughly 7 times higher than veterinary-only antibiotics at 52.6 ng/L.
Ofloxacin posed medium ecological risk (risk quotient 0.1–1.0) in sewers near hospitals, the only antibiotic to cross that threshold.
Strong statistical links between veterinary and human-veterinary antibiotic loads suggest livestock farming is transferring antibiotic residues into urban sewers via the food chain.
chevron_right Technical Summary
Researchers mapped how antibiotics move through city sewer systems, finding that veterinary and shared human-veterinary antibiotics are the most common, with one antibiotic (Ofloxacin) posing measurable ecological risk near hospitals. Antibiotics from livestock appear to reach sewers through the food chain, not just direct discharge.
Abstract Preview
This study systematically investigated the spatiotemporal distribution, driving factors, and ecological risks of antibiotics in urban sewer systems. Only veterinary antibiotics (VAs) and human/vete...
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