College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
NUS Environment Research Institute, National University of Singapore, 5A Engineering Drive 1, 117411, Singapore.
J Hazard Mater. 2023 Mar 5;445:130596. doi: 10.1016/j.jhazmat.2022.130596. Epub 2022 Dec 14.
Microplastics (MPs), as an emerging pollutant, have been widely detected in aquatic, terrestrial, and atmospheric ecosystems. Recently, more researchers indicated that solid organic waste is also a crucial repository of MPs and has become a vital pollution source in ecosystems. Although the occurrence and fate of MPs in solid organic waste and the interaction between MPs and biological treatments have been explored, there still needs to be comprehensive summaries. Hence, this study reviewed the occurrence and characteristics of MPs in solid organic waste and organic fertilizers. Meanwhile, this study summarized the influence of MPs on biological treatments (composting and anaerobic digestion) and their degradation characteristics. MPs are abundant in solid organic waste (0-220 ×10 particles/kg) and organic fertilizer (0-30 ×10 particles/kg), PP and PE are the prominent MPs, and fibers and fragments are the main shapes. MPs can affect the carbon and nitrogen conversion during biological treatments and interfere with microbial communities. The MP's characteristics changed after biological treatments, which should further consider their potential ecological risks. This review points out the existing problems of MPs in organic waste recycling and provides directions for their treatment in the future.
微塑料（MPs）作为一种新兴污染物，已广泛存在于水、陆、气生态系统中。最近，越来越多的研究人员表明，固体有机废物也是 MPs 的重要储存库，已成为生态系统中的重要污染源。尽管 MPs 在固体有机废物中的存在和归宿以及 MPs 与生物处理之间的相互作用已被探索，但仍需要全面总结。因此，本研究综述了 MPs 在固体有机废物和有机肥料中的存在和特征。同时，本研究总结了 MPs 对生物处理（堆肥和厌氧消化）及其降解特性的影响。MPs 在固体有机废物（0-220×10 个颗粒/kg）和有机肥料（0-30×10 个颗粒/kg）中含量丰富，PP 和 PE 是主要的 MPs，纤维和碎片是主要形态。MPs 会影响生物处理过程中的碳氮转化，并干扰微生物群落。MPs 的特征在生物处理后发生了变化，因此应进一步考虑其潜在的生态风险。本综述指出了有机废物回收中 MPs 存在的问题，并为其未来的处理提供了方向。
