Occurrence, effects, and biodegradation of plastic additives in sludge anaerobic digestion: A review,Environmental Pollution

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Occurrence, effects, and biodegradation of plastic additives in sludge anaerobic digestion: A review
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-09 , DOI: 10.1016/j.envpol.2021.117568
Yinguang Chen ₁ , Yu Zhang ₂ , Zhengzhe Zhang ₂

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The retention of microplastics, a complex blend of polymers and plastic additives (PAs), in municipal sludge has been reported. The inevitable release of PAs from microplastics might affect the subsequent biological disposal of sludge, and their final fate are of great public concern. Therefore, this review describes the current knowledge in the occurrence of PAs in sludge and significant advances in their effects on sludge anaerobic digestion (AD) and their biodegradation performance. Specifically, the compositions and contents of plasticizers, stabilizers, and flame retardants in sludge worldwide are systematically summarized. The discrepant impacts of PAs on hydrolysis, acidification, and methanogenesis processes are analyzed and compared, with corresponding trends deduced. Furthermore, the biodegradation performances of PAs during sludge AD are also discussed. For most of the PAs detected in sludge, available data for their fate and effects on AD is yet limited. Moreover, the potential role of AD microbes in the release of PAs from microplastics was still unknown. Especially, the potential effects of PAs released from biodegradable microplastics on sludge AD and their fate should be of concern. The obtained knowledge would update our understanding of the risk assessment and control of PAs in sludge AD. Recommendations for future investigation are made.

中文翻译：

污泥厌氧消化中塑料添加剂的发生、影响和生物降解：综述

据报道，微塑料是聚合物和塑料添加剂 (PA) 的复杂混合物，在城市污泥中滞留。微塑料中不可避免的 PA 释放可能会影响随后的污泥生物处置，其最终命运受到公众的高度关注。因此，这篇综述描述了目前对污泥中 PA 存在的认识，以及它们对污泥厌氧消化 (AD) 的影响及其生物降解性能的重大进展。具体系统总结了国内外污泥中增塑剂、稳定剂、阻燃剂的组成和含量。分析比较了 PA 对水解、酸化和产甲烷过程的不同影响，并推断出相应的趋势。此外，还讨论了污泥 AD 过程中 PA 的生物降解性能。对于污泥中检测到的大多数 PA，有关其命运和对 AD 影响的可用数据仍然有限。此外，AD 微生物在微塑料释放 PA 中的潜在作用仍然未知。特别是，可生物降解微塑料释放的 PA 对污泥 AD 的潜在影响及其归宿应引起关注。所获得的知识将更新我们对污泥 AD 中 PA 的风险评估和控制的理解。提出了未来调查的建议。

更新日期：2021-06-09

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