污泥和微塑料在污泥热水解过程中的相互作用
Weipeng Han1, Xiuhong Liu2, Yaxin Wang1
1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
Journal of hazardous materials
|September 12, 2024
概括
污泥的热水解 (THS) 加快了微塑料 (MP) 的老化,增加了聚乙烯和聚乙烯四甲酸盐的碎片化和化学变化. 这一过程显示出在废水处理过程中在现场清除MP的前景.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 微塑料 (MPs) 在处理过程中积聚在废水污泥中.
- 污泥的热水解 (THS) 是一种改变MP结构的潜在方法.
研究的目的:
- 研究THS对聚乙烯 (PE) 和聚乙烯四甲酸 (PET) MPs的物理化学特性和降解的影响.
- 了解泥降解和THS期间的MP老化之间的相互作用.
主要方法:
- 在不同温度 (120°C-180°C) 下,PE和PETMP暴露于THS.
- 分析MP的结构和化学变化,使用评估碎片,氧化和水解的技术.
- 监测污泥过物的有机和含量变化.
主要成果:
- 污泥退化和MP老化表现出一种协同作用的关系.
- PE和PETMP增加了污泥过物的有机和度,增强了有机转化.
- 在120°C-180°C的表面碎片和断裂时,MP的脆性增加了.
- PE和PETMP分别在160°C和140°C进行了热氧化和还原反应,化学结构发生了显著的变化.
- 水解,分解和热水切割破坏了聚合物链,形成各种短链化合物.
结论:
- 通过物理和化学降解途径,THS显著改变了PE和PETMP的结构.
- 在THS期间,污泥和MP之间的相互作用促进了MP的老化和转化.
- 这项研究为污泥处理过程中的微塑料在现场去除提供了有前途的方法.
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