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A survey of microplastics in wastewater from large-scale dairy farms and their surroundings in inner Mongolia of China
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Researchers surveyed microplastic contamination in wastewater from nine large dairy farms in Inner Mongolia, China, identifying 29 different plastic polymer types — with polyisoprene, PVC, and polyurethane most common — and found that existing treatment ponds removed microplastics poorly. The study highlights dairy farm wastewater as an underappreciated source of microplastic pollution reaching surrounding environments.
Microplastics (MPs), tiny polymeric particles resulting from the degradation of plastic waste and environmental erosion, pose significant threats to ecosystems, animal health, and human well-being. This study assessed MPs abundance in wastewater and surrounding environments from nine large dairy farms in Inner Mongolia, China, focusing on oxidation ponds. Using laser direct infrared spectroscopy (LDIR), MPs were detected in 42 samples, identifying 29 polymer types, with polyisoprene (22.69%), polyvinyl chloride (16.58%), and polyurethane (10.47%) being the most common. The results revealed a high abundance of MPs in oxidation ponds, while MPs removal efficiency remained unsatisfactory. To better understand the ecological risks posed by MPs, several pollution assessment indices were employed to evaluate their ecological impact. The assessment results indicated that current ecological risk levels were low, suggesting that the immediate threat of MPs to human health and the environment is relatively minor. Using a positive matrix factorization (PMF) model, the sources, composition, and distribution characteristics of MPs were thoroughly analyzed. Based on these findings, this study would provide insights for improving and innovating existing wastewater treatment technologies, with the goal of enhancing MPs removal efficiency and contributing to environmental protection efforts.
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Researchers investigated microplastic and nanoplastic pollution across nine large-scale dairy farms in Inner Mongolia, China, analyzing soil, feed, and atmospheric samples. They found that feed contained the highest microplastic abundance, with fragment-shaped particles smaller than 100 micrometers dominating all sample types. While all sites were assessed as low ecological risk, the study provides a comprehensive baseline for understanding plastic contamination sources in livestock farming environments.
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Microplastic contamination was found in drainage channels and main drainage waterways in a large irrigation district in Inner Mongolia, China. Fibers dominated, likely from agricultural plastic mulch films, with pollution levels varying by channel type and location within the irrigated area.
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Researchers analyzed 65 fecal sewage samples from rural households across 27 Chinese provinces to characterize microplastic contamination in household treatment facilities. The study found microplastic abundances ranging from 47 to 143 particles per liter, with higher levels in northern China, and identified fecal sewage irrigation as a potential source of microplastic contamination in farmland soils.
Significant effects of rural wastewater treatment plants in reducing microplastic pollution: A perspective from China's southwest area
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Researchers studied microplastic pollution at rural wastewater treatment plants in southwestern China and found influent concentrations of 3.8 to 8.2 particles per liter, with removal rates of only 14 to 55%. Based on national sewage discharge data, they estimated China's annual microplastic emissions through wastewater at nearly 3,000 tons, with rural areas contributing about 25%. The study highlights that rural wastewater systems, though often overlooked, represent a significant source of microplastic pollution entering waterways.
Occurrence and distribution of microplastics in domestic, industrial, agricultural and aquacultural wastewater sources: A case study in Changzhou, China
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Researchers investigated microplastic occurrence across diverse wastewater sources in Changzhou, China, including domestic, industrial, agricultural, and aquaculture facilities. The study found microplastics present in all types of wastewater, with varying compositions and abundances, highlighting the multiple pathways through which microplastics enter the environment from human activities.
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