在无氧和有氧消化过程中聚乙烯的生物衰老
Maha Dassouki Dit Tahan1, Melek Canbulat Özdemir1, F Dilek Sanin1
1Department of Environmental Engineering, Middle East Technical University, 06800 Ankara, Türkiye.
Bioresource technology
|March 14, 2025
概括
这项研究检查了废水处理中的微塑料,发现高密度聚乙烯 (HDPE) 减少了甲产量,而低密度聚乙烯 (LDPE) 显示生物老化,但没有处理影响.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 在废水处理厂 (WWTP) 中越来越多地检测到微塑料 (MP).
- 它们对治疗过程及其自身命运的影响需要调查.
- 聚乙烯 (PE) 是一种常见的MP类型,具有高密度 (HDPE) 和低密度 (LDPE) 变体.
研究的目的:
- 评估HDPE和LDPE对美索菲尔有氧和无氧消化过程的影响.
- 为了描述消化后的MP,以了解生物降解.
- 为了将MP特性 (添加剂,结构) 与生物衰老和治疗影响相关联.
主要方法:
- 有氧和无氧消化器暴露于HDPE和LDPE.
- 监测消化性能 (例如甲生产).
- 使用技术来评估表面变化和生物降解的MP的特征.
主要成果:
- 带有紫外线稳定剂的HDPE保持不变;没有添加剂的LDPE表现出生物老化.
- 在无氧消化过程中,HDPE显著减少了26%的甲产量,但在有氧消化过程中却没有.
- 即使在高剂量 (300 mg PE/g TS) 中,LDPE也没有对消化过程产生负面影响.
- 聚乙烯的生物老化与其无形/晶体结构以及添加剂的存在有关.
结论:
- MPs对WWTP的影响取决于聚合物类型,添加剂和结构.
- 在测试条件下,HDPE可以抑制无氧消化,而LDPE在测试条件下看起来更为良性.
- MP生物衰老是影响其命运和在WWTP中的潜在相互作用的关键因素.
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