Unraveling the Effect of Continuously Accumulating Microplastics on the Humification of Dissolved Organic Matter in the Composting System
文献类型： 外文期刊
作者： Chen, Liying 1 ; Feng, Yanfang 3 ; He, Jiehong 1 ; Zhang, Qiuyue 3 ; Han, Lanfang 1 ;
作者机构： 1.Guangdong Univ Technol, Sch Ecol Environm & Resources, Guangdong Prov Key Lab Water Qual Improvement & Ec, Guangzhou 510006, Peoples R China
2.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China
3.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China
关键词： microplastics; composting; dissolved organic matter; humification; preferential sorption
期刊名称：ACS ES&T ENGINEERING （ 影响因子：7.1； 五年影响因子：7.1 ）
ISSN：
年卷期： 2023 年 3 卷 6 期
页码：
收录情况： SCI
摘要： Microplastics (MPs) accumulation in composting systems has received considerable attention in recent years. However, the ecological risk of MPs on composting environments remains scarcely explored. This study investigated the impact of polyethylene and polyethylene terephthalate MPs on the structural evolution of dissolved organic matter (DOM) during composting. The ultraviolet, excitation-emission matrix, and Fourier transform ion cyclotron resonance mass spectroscopy collectively suggested that MPs caused DOM of compost to have lower aromaticity and fewer humic acid-like substances, particularly at the early stage of composting. This inhibition effect of MPs on the aromatization of DOM of compost was proved to result from not only the altered compost characteristics (e.g., lower pH and temperature relative to the control) but also the preferential sorption of specific DOM compositions by MPs. The sorption of DOM by MPs before and after composting showed that the protein-like components and microbial by-product analogues, which were significant substrates for humification, were found to be preferentially sorbed by two MPs and thus were prevented from being directly humified by some microorganisms. The finding would contribute to an in-depth explanation of the mechanisms by which MPs affect compost humification and provide insight into the ecological risks of MPs for composting environments.
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