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Longitudinal study on the multifactorial public health risks associated with sewage reclamation
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Researchers monitored six Spanish wastewater treatment plants over a full year and found that while the plants effectively removed respiratory viruses like SARS-CoV-2, microplastics and antibiotic-resistance genes persisted in both treated effluent and sewage sludge released into the environment. The findings underscore that current wastewater treatment is not designed to eliminate these emerging contaminants, raising concerns about their spread through recycled water and biosolids.
Abstract This year-long research analyzed emerging risks in influent, effluent wastewaters and biosolids from six wastewater treatment plants in Spain’s Valencian Region. Specifically, it focused on human enteric and respiratory viruses, bacterial and viral faecal contamination indicators, extended-spectrum beta-lactamases-producing Escherichia coli , and antibiotic-resistance genes. Additionally, particles and microplastics in biosolid and wastewater samples were assessed. Human enteric viruses were prevalent in influent wastewater, with limited post-treatment reduction. Wastewater treatment effectively eliminated respiratory viruses, except for low levels of SARS-CoV-2 in effluent and biosolid samples, suggesting minimal public health risk. Antibiotic resistance genes and microplastics were persistently found in effluent and biosolids, thus indicating treatment inefficiencies and potential environmental dissemination. This multifaced research sheds light on diverse contaminants present after water reclamation, emphasizing the interconnectedness of human, animal, and environmental health in wastewater management. It underscores the need for a One Health approach to address the United Nations Sustainable Development Goals.
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Sewage reclamation process as multifactorial public health risk concern: a longitudinal study.
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This year-long study analyzed influent, effluent, and biosolids from six Spanish wastewater treatment plants, identifying persistent emerging risks including pharmaceuticals, microplastics, and antibiotic resistance genes throughout the treatment process.
Holistic assessment of chemical and biological pollutants in a Mediterranean wastewater effluent-dominated stream: Interactions and ecological impacts
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Researchers conducted a comprehensive assessment of pollution downstream from a wastewater treatment plant discharge into a Mediterranean river in Spain. They found elevated levels of pharmaceuticals, metals, microplastics, PFAS chemicals, and antibiotic resistance genes below the discharge point, though some recovery occurred within about 500 meters downstream. The study demonstrates that even treated wastewater significantly alters river water quality and microbial communities, highlighting the need for improved treatment technologies.
Quantification and Characterization of Microplastics in Seven Urban Wastewater Treatment Plants
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Researchers tested wastewater treatment plants in Spain and found tiny plastic particles (microplastics) in the water both before and after treatment—meaning these plants aren't fully removing them. Most of the plastic bits were fibers, likely from fabrics and textiles, small enough to easily spread into rivers and oceans once released. While this study didn't measure health effects directly, it highlights that treated wastewater is an ongoing source of microplastic pollution in our environment, which matters since these particles can end up in drinking water, soil, and the food chain.
Antibiotic resistance genes and virulence factors in the plastisphere in wastewater treatment plant effluent: Health risk quantification and driving mechanism interpretation
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Researchers found that microplastics in treated wastewater carry significantly more disease-causing bacteria, antibiotic resistance genes, and virulence factors on their surfaces compared to the surrounding water. This means microplastics released from wastewater treatment plants into rivers and lakes could spread antibiotic-resistant infections, posing a direct risk to communities that rely on these water sources.
Collaborative removal of microplastics, bacteria, antibiotic resistance genes, and heavy metals in a full-scale wastewater treatment plant
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Researchers tracked how a full-scale wastewater treatment plant in China simultaneously removes microplastics, bacteria, antibiotic resistance genes, and heavy metals, finding that while the plant removed over 80% of incoming microplastics, those that remained in the effluent were associated with elevated levels of antibiotic resistance genes and heavy metals. Microplastics appeared to serve as carriers that concentrate and co-transport these co-contaminants through treatment processes. This raises important concerns: even "clean" treated wastewater discharged into rivers may carry microplastics loaded with antibiotic-resistant bacteria and toxic metals.
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