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表面活性剂和抗生素的同时出现重塑了在污泥无氧发酵过程中产生挥发性脂肪酸的酸性过程

Jingyang Luo¹, Zhicheng Wei¹, Xiaoshi Cheng¹

¹Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, PR China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, PR China.

The Science of the total environment

|September 15, 2023

概括

在废弃活性污泥中,二甲基硫酸盐 (SDBS) 和硫黄 (SDZ) 的同时存在显著增加了挥发性脂肪酸 (VFA) 的产生. 这种协同作用增强了污泥溶解,并丰富了关键的微生物群落,以改善无氧发酵.

科学领域:

环境微生物学环境微生物学
生物技术是生物技术.
废物管理废物管理

背景情况:

表面活性剂,如二甲基硫酸盐 (SDBS) 和抗生素,如硫法 (SDZ) 在废物活性污泥 (WAS) 中普遍存在.
以前的研究集中在单个污染物的影响上,忽视了无氧发酵中的协同效应.

研究的目的:

研究SDBS和SDZ在WAS无氧发酵过程中对挥发性脂肪酸 (VFA) 生物合成的联合作用.
阐明污泥处理中SDBS和SDZ之间协同作用的机制.

主要方法:

在具有唯一SDZ,唯一SDBS和同时发生的SDBS/SDZ的反应堆中对无氧发酵进行比较分析.
评估VFA生成,污泥溶解和微生物群落结构.
对关键微生物代谢途径和功能性基因表达的分析.

主要成果:

SDBS和SDZ的同时出现显著增加了VFA产量 (200.0-211.9%与唯一SDZ相比;5.9-20.4%与唯一SDBS相比).
同时发生增强了污泥溶解,水解和酸化阶段.
微生物社区结构发生了转变,丰富了像Acetoanaerobium和Fususibacter这样的水解酸性细菌.
观察到参与细胞外水解,细胞内代谢和脂肪酸生成的基因的升级.

结论:

SDBS和SDZ表现出协同效应,促进了WAS无氧发酵中的VFA产量.
协同作用是由增强的污泥分解,改善污染物生物可用性,以及微生物联盟和代谢功能的有利转变驱动的.
了解这些相互作用对于在共污染物存在的情况下优化无氧消化过程至关重要.

关键词:

无氧发酵是无氧发酵的方法.抗生素抗生素是一种抗生素.关键石微生物关键石微生物网络分析网络分析表面活性剂是什么?表面活性剂是什么?挥发性脂肪酸是一种挥发性脂肪酸.

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