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排放的有机物促进了无氧甲氧化,并减少了河流沉积物中的氧化

Chenhui Yu¹, Qiang He¹, Wen-Bo Nie¹

¹College of Environment and Ecology, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

|March 6, 2025

概括

废水废弃物有机物 (EfOM) 显著增加了河流沉积物中的甲氧化和氧化减少. 这突出了EfOMOM的重要性.

科学领域:

环境微生物学环境微生物学
地质化学地质化学
生物地质化学循环的过程

背景情况:

废水处理厂 (WWTP) 的废物有机物 (EfOM) 含有类似的物质.
这些物质充当电子穿器,影响微生物介导的氧化还原反应.
在接收WWTP废水的河流沉积物中,甲无氧氧化 (AOM) 和氧化 (N2O) 减少之间的相互作用尚未得到充分理解.

研究的目的:

调查EfOM对河流沉积物中甲 (AOM) 和氧化 (N2O) 减少的无氧氧化作用的影响.
阐明EfOM影响这些温室气体过程的机制.
在不同的EfOM条件下识别参与这些过程的微生物群落.

主要方法:

使用无毒河流沉积物与不同的废水废水稀释比率的化实验.
测量AOM和N2O减少率.
进行元基因组和元转录组分析以识别微生物种群及其功能.

主要成果:

EfOM显著提高了AOM和N2O减少率.
AOM率从8.1增加到14.3μg gdw-1d-1,N2O的减少率从29.2增加到56.5μg gdw-1d-1.
依赖酸盐的厌氧甲氧化 (n-DAMO) 旧菌和脱细菌占主导地位,脱细菌被证实是N2O降低剂,由EfOM促进.

结论:

在将AOM和N2O减排过程联系起来,EfOM起着至关重要的作用.
废水废水排放可以成为淡水生态系统中同时发生甲和氧化沉没的驱动因素.
EfOM促进了n-DAMO古生物和N2O减速器之间的电子转移,影响了温室气体的动态.

关键词:

甲的无氧氧化氧化.废水是有机物质的废水.电子航天器的电子航天器氧化还原法氧化还原法河流沉积物的沉积物

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