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液压压力驱动微生物介导的微塑料在深水库的表面沉积物中的生物降解:来自液压压力模拟实验的新发现

Kehong Yu¹, Beibei Chai², Tianyu Zhuo³

¹School of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China.

|June 16, 2023

概括

高水立压加快了水库沉积物中的微塑料生物降解,改变了微塑料的尺寸和形状. 这种压力驱动的过程增强了微生物群落和关键的塑料降解基因,为环境塑料清除提供了洞察力.

科学领域:

环境科学环境科学
微生物学微生物学
地质化学地质化学

背景情况:

由塑料降解而产生的微塑料,通过食物链对人类健康构成风险.
了解饮用水库中的微塑料分布和微生物降解至关重要,但有限.
水静压在深水库沉积物中微塑料生物降解中的作用仍然在很大程度上未被探索.

研究的目的:

在不同水静压下,研究水库沉积物中的微塑料发生模式和相关微生物群落.
阐明水静压对微塑料生物降解途径和功能基因的影响.

主要方法:

微塑料大小,形状和类型的分析使用里埃变换和激光直接红外光谱学.
超基因组分析以评估微生物社区结构和功能基因丰度.
在不同的压力条件下对特定生物降解基因 (例如,paAK,ladA,tphA3) 的量化.

主要成果:

升高的液压压力改变了微塑料的尺寸和形状,对较小的颗粒 (20500μm) 有明显的影响.
高压加快了微塑料的分解,以聚乙烯二甲酸 (PET) 的尺寸从425.78μm减少到366.62μm在0.7 MPa时为例.
在更高的压力下观察到塑料降解基因 (Rhodococcus,Flavobacterium,Aspergillus) 和特定生物降解基因的相对丰度增加,尽管tphA3基因丰度下降.

结论:

液压压力显著影响水库沉积物中的微塑料生物降解.
这项研究直接证明了压力驱动的微生物新陈代谢有助于微塑料减小.
对压力介导的微生物社区动态和水生环境中微塑料降解的代谢途径的新见解.

关键词:

功能性基因是指功能性的基因.水定压力压力是水定压力.微生物社区结构是微生物的社区结构.微塑料是一种微塑料.储水池沉积物的沉积物

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