在模拟的黑暗环境下,聚乙烯的微生物介导降解和相关污染物的释放
Changfu Yang1, Qiujie Huang1,2, Hui Wang1
1School of Environmental Science and Engineering, Shanghai Engineering Research Center of Solid Waste Treatment, Shanghai Jiao Tong University, Shanghai 200240, China.
无氧微生物在垃圾填埋场中缓慢降解聚乙烯 (PE),释放纳米塑料和酸盐. 这项研究揭示了一种结合氧化-生物降解-碎片化过程,控制PE.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 聚合物科学 聚合物科学
背景情况:
- 聚乙烯 (PE) 是全球包装废物的重要组成部分.
- 对于PE在黑暗,无毒环境中的命运,如垃圾填埋场,人们对此了解甚少.
- 垃圾填埋场是废弃塑料的重要储存库.
研究的目的:
- 为了研究PE在垃圾填埋条件下的微生物降解.
- 为了确定PE降解的副产品和机制.
- 评估垃圾填埋场持续时间对PE易受微生物攻击的影响.
主要方法:
- 800天的微观实验,使用来自活跃垃圾填埋场的PE样本.
- 分析PE表面变化,功能组和液成分.
- 与PE相关的微生物群落及其功能的特征.
主要成果:
- 无氧微生物慢慢降解PE,增加表面粗度和氧化功能组.
- 观察到纳米塑料 (NP) 和甲酸 (PAE) 的显著释放.
- 埋葬了7年的PE显示出对微生物降解的最高敏感性.
- 微生物群落表现出决定性组合,功能性种群驱动PE衰老.
结论:
- 一个结合氧化-生物降解-碎片化的反机制决定了PE在垃圾填埋场的命运.
- 微生物扮演着双重的角色:降解PE和释放二次污染物.
- 了解这些过程对于处理垃圾填埋场中的塑料废物至关重要.
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