Booming microplastics generation in landfill: An exponential evolution process under temporal pattern

微塑料 环境科学 塑料污染 废物管理 塑料废料 聚丙烯 土地复垦 环境工程 环境化学 材料科学 化学 生物 生态学 工程类 复合材料
作者
Qiujie Huang,Zhaowen Cheng,Yang Changfu,Hui Wang,Nanwen Zhu,Xinde Cao,Ziyang Lou
出处
期刊:Water Research [Elsevier BV]
卷期号:223: 119035-119035 被引量:37
标识
DOI:10.1016/j.watres.2022.119035
摘要

Landfills are the main plastic sinks and microplastics (MPs) sources in the anthropogenic terrestrial system. Understanding the dynamic process of generating MPs is a prerequisite to reducing their potential risk, which remains unexplored because of the complex stabilization process of landfills. In this study, we investigated the evolution process of MPs generated in a partitioned landfill, with well-recorded disposal ages of over 30 years. Considering the initial plastic proportions in fresh landfilled waste, the occurrence of MPs increased exponentially with the disposal age. A booming generation of MPs occurred from 71.3 ± 17.7 items/(g plastic) to 653.1 ± 191.5 items/(g plastic). The generation rates of MPs varied greatly depending on the individual polymer types, with polyethylene (PE) having the highest generation rate of 28.4 items/(g plastic) per year at 31 years, compared to that of polypropylene (PP) and polystyrene (PS) at 15.0 and 9.6 items/(g plastic) per year, respectively. The variation in the carbonyl index indicated that environmental oxidation might facilitate the fragmentation of plastic waste. The relative abundance of plastic-degrading microbes increased more than three times in the plastisphere after 30 years of landfilling, indicating that the potential biodegradation might be a nonnegligible driver for plastic fragmentation after long-term natural acclimatization. This study revealed the dynamic evolution process of MPs in landfills and predicted the booming stage, which might provide an important guideline for reducing the leakage risk of MPs during the reclamation of old landfills or dumping sites.
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