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在模拟垃圾填埋条件下对生物塑料生物降解的评估

Berivan Ülger-Vatansever¹, Turgut Tüzün Onay², Burak Demirel²

¹Institute of Environmental Sciences, Boğaziçi University, Bebek/İstanbul, 34342, Turkey. berivan.ulger@boun.edu.tr.

Environmental science and pollution research international

|October 4, 2023

概括

聚乳酸 (PLA) 生物塑料在有氧和半有氧垃圾填埋条件下呈现最小的降解. 然而,在无氧条件下观察到显著的生物降解迹象,包括体重减轻和表面损伤.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
废物管理废物管理

背景情况:

生物塑料,如聚乳酸 (PLA),被推广为传统塑料的可持续替代品.
生物塑料的长期环境命运,特别是它们在垃圾填埋场中的生物降解性,仍然在很大程度上未被调查.
了解垃圾填埋场中的生物塑料行为对于评估其真正的环境影响至关重要.

研究的目的:

在模拟城市固体废物 (MSW) 填埋条件下评估聚乳酸 (PLA) 生物塑料的生物降解性.
评估不同垃圾填埋场稳定阶段的PLA降解:有氧,半有氧和无氧.

主要方法:

实验室规模的 lysimeter 实验模拟了垃圾填埋场条件进行.
反应堆充满了MSW,PLA杯和种子污泥,在有氧,半有氧和无氧阶段运行.
液和生物气被监测;用扫描电子显微镜 (SEM) 分析了PLA杯的体重减轻和表面变化.

主要成果:

在有氧和半有氧垃圾填埋场稳定阶段,PLA生物塑料的生物降解程度可以忽略不计.
在无氧阶段,PLA杯表现出明显的变化:变得更软,更白.
PLA杯的平均重量损失为12.8%,观察到显著的表面损伤,表明生物降解潜力.

结论:

聚乳酸 (PLA) 生物塑料在垃圾填埋的初始有氧和半有氧阶段显示出有限的生物降解性.
垃圾填埋场的无氧条件更有利于PLA生物降解,这是物理和化学变化所证明的.
需要进一步的研究,以充分阐明长期生物降解途径和PLA在垃圾填埋环境中的环境影响.

关键词:

无氧消化消化无氧消化溶解液是一种溶解液.塑料污染问题塑料污染问题聚乳酸是一种多乳酸.固体废物管理固体废物管理废物稳定废物稳定

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