Transport and accumulation of microplastics through wastewater treatment sludge processes
| Autor: | Cornelis A.M. van Gestel, Seyed Hossein Hashemi, Somayye Sadat Alavian Petroody |
|---|---|
| Přispěvatelé: | Animal Ecology |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Microplastics
Environmental Engineering Health Toxicology and Mutagenesis Rejected water 0208 environmental biotechnology Aerobic treatment system 02 engineering and technology Iran Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Clarifier Water Purification Settling Dry weight Environmental Chemistry Internal recirculation Treatment plant 0105 earth and related environmental sciences Sludge processing Sewage Public Health Environmental and Occupational Health General Medicine General Chemistry Pulp and paper industry Pollution Dewatering 020801 environmental engineering Environmental science Sewage treatment SDG 6 - Clean Water and Sanitation Plastics Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Alavian Petroody, S S, Hashemi, S H & van Gestel, C A M 2021, ' Transport and accumulation of microplastics through wastewater treatment sludge processes ', Chemosphere, vol. 278, 130471, pp. 1-9 . https://doi.org/10.1016/j.chemosphere.2021.130471 Chemosphere, 278:130471, 1-9. Elsevier Limited |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2021.130471 |
| Popis: | Wastewater treatment plants (WWTPs) are important routes for releasing microplastics into the environment, with the produced sludge acting as a recipient of microplastics from wastewater. There is little information on the impact of sludge processes on the number of microplastics in sludge. In this study, the presence of microplastics in sludge produced by the Sari WWTP in northern Iran was investigated. Samples were taken in 3 replications and microplastics larger than 37 μm were extracted. The sludge from primary settling tank, clarifier, after sludge thickener and after aerobic digester, and after dewatering contained 214, 206, 200, 238, and 129 microplastics/g dry weight, respectively. According to the amount of sludge produced for each unit, this equals 280, 362, 599, 601, and 276 million microplastics/day, respectively, of which more than 85% were fibers. The numbers of microplastics in the sludge from the output of the sludge thickener and the aerobic digester did not significantly differ. However, their numbers decreased by more than 50% after dewatering, probably due to the destruction of flocs in the digestive process and the release of attached microplastics, which are returned into the wastewater treatment process with the rejected water. Polyester and polyethylene were the predominant types of fibers and particles, respectively. Given the annual amount of sludge produced, more than 100 billion microplastics enter the environment per year. Wastewater sludge, therefore, is an important source for the emission of microplastics, especially fibers, to the environment, warranting further evaluation of the associated environmental hazards. |
| Databáze: | OpenAIRE |
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