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Prevalence of microplastics and fate in wastewater treatment plants: a review
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Researchers reviewed the sources, transport pathways, and fate of microplastics in wastewater treatment plants, finding that while treatment removes the majority of particles, daily effluent discharges still release hundreds of millions of microplastics to the environment, and COVID-19 personal protective equipment has emerged as a significant additional source.
Microplastics have multidimensional traits, as compared to other emerging contaminants, presenting a concern to terrestrial, aquatic life and humans through inhalation or ingestion. Hazardous chemicals adsorbed on microplastics could potentially be transferred to the environment or consumed by living organisms. We review the transformation of plastic waste in the environment, the origin and transportation of microplastics, the regulatory measures for plastic and microplastic pollution, and the fate of microplastics in wastewater treatment plants. Plastic debris is building up in the environment despite legislative attempts by many countries. Accumulated plastic waste from a range of sources breaks down into smaller fragments and microplastics through chemical, physiochemical and biodegradation mechanisms. This review also discusses personal protective equipment in relation to COVID-19 as a source of microplastics. Millions of microplastics are discharged into the environment through effluents and biosolids. Daily microplastic emissions to the environment from effluent range about 0.46 million to 140 billion. Previous studies had only explored the existence of microplastics in wastewater treatment plants, with limited visualization of how microplastics interact with the various treatment technologies used in wastewater treatment plants.
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Wastewater treatment plants (WWTPs) are major conduits for microplastics into the environment, yet even advanced treatment systems fail to fully remove the smallest particles before discharge. Understanding microplastic fate across treatment stages is essential for developing targeted mitigation strategies that reduce the tonnage of plastic particles entering rivers, soils, and ultimately the food supply.
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Fate of Microplastics in Wastewater Treatment Plants
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This book examines how microplastics move through wastewater treatment systems, covering sources, treatment technologies, system-specific factors, and future challenges for improving removal efficiency. Understanding the fate of microplastics in wastewater infrastructure is critical because treatment plants simultaneously serve as a primary barrier against and a significant ongoing source of microplastic discharge into aquatic environments.
Occurrence and Removal of Microplastics in Wastewater Treatment Plants
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Researchers reviewed how microplastics accumulate in wastewater treatment plants and how effectively current treatment technologies remove them, finding that while plants capture most microplastics, significant quantities still pass through into receiving waterways with each discharge cycle.
Efficiency of microplastics removal in selected wastewater treatment plants – preliminary studies
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Wastewater treatment plants in Poland were found to remove about 95-99% of microplastic particles from sewage before it's released into rivers and streams, with most of the trapped plastic ending up concentrated in the leftover sludge. That's good news since it means treatment plants are catching most microplastics before they reach waterways, but it also means the sludge, which is sometimes used as fertilizer on farmland, may need more scrutiny to prevent these particles from re-entering the environment and, potentially, our food supply.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.