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Composting treatment increases the risk of microplastics pollution in process and compost products

文献类型： 外文期刊

作者： Zhang, Jiajia 1 ; Liu, Jiawei 2 ; Ding, Wencheng 3 ; Zhang, Baogui 2 ; Zhao, Meng 1 ; Zou, Guoyuan 1 ; Chen, Yanhua 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

2.China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China

3.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China

关键词： Microplastics; Organic compost; Composting process; Dynamic pollution characteristic; Pollution level

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 486 卷

页码：

收录情况： SCI

摘要： Organic compost is a significant carrier of microplastics (MPs) entering agricultural soil. However, the extent of MPs pollution during composting, a widely employed organic waste treatment technology, remains unknown. This study investigated MPs dynamic pollution characteristics during composting and compost products using agricultural wastes as raw materials and quantitatively evaluated ecological risks of MPs pollution. Sorting/screening before and after composting significantly reduced MPs abundance by 29.4 % and 32.1 %, respectively, but substantial quantities of MPs persisted in final compost products. Microplastics were mainly 0.5-1 mm (30.3 %), colored fibers/fragments composed of PP/PE, PE, or PP. Regardless of whether plastics in raw materials were sorted, composting increased MPs abundance from 5133-7867 items kg(-1) in raw materials to 5667-11200 items kg(-1) in compost products and smaller MPs (<1 mm) proportion from 48.5 % to 54.4 %, while significantly decreased size from 1328 mu m to 1093 mu m. After composting, MPs exhibited rougher morphologies (folds, cracks, and grooves) and adhered to more mineral colloids, and the pollution level increased. Collectively, composting treatment enhances MPs pollution risk both during composting process and in compost products. These findings present a theoretical reference for the establishment of limit standards for MPs in organic compost.

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