数字农科院2.0

Microplastic accumulation and transport in agricultural soils with long-term sewage sludge amendments

文献类型： 外文期刊

作者： Weimin Zhou;Jiukai Xu;Bomin Fu;Yang Wu;Kai Zhang;Juanjuan Han;Jiejing Kong;Yibing Ma

作者机构：

关键词： Accumulation;Land application;Microplastic;Migration;Municipal sludge

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2024 年 480 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Land application of sewage sludge brings microplastic contamination to soil. However, studies regarding the occurrence and mobility of sludge-borne microplastics in soil are insufficient. In the present study, based on an experimental field, the effects of sludge application amount on the accumulation and migration of microplastics in 0–20 (upper) and 20–40 cm (lower) soil layers were evaluated. After 16 years of continuous sludge application (36 t/ha per year), the microplastic content and migration ratio in upper soil reached 6811 particles/kg and 148 %, which was about 5 and 20 times, respectively, higher than that of the control soil without sludge. The microplastics in upper and lower soil layers, were mainly 0.2–0.5 mm in size, mostly fibrous in shape, primarily transparent in color, and predominantly rayon in composition. Microplastic surfaces may persistently adsorb clay minerals and iron/titanium oxides from soil, posing potential environmental risks. Sludge application had a significant positive correlation with soil microplastic abundance, resulting in a good fit of predictive model constructed for microplastic accumulation in sludge-amended soils. These findings help to improve the knowledge on environmental behavior of microplastics in sludge-amended soil, and can provide a scientific basis for the regulation of microplastic pollution during sludge land application.

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