表面活性剂和CeO2/Fe2O3纳米颗粒在半连续污泥发酵过程中在挥发性脂肪酸生物合成上同时发生的时间依赖干扰
Xinyi Liu1, Wen Guo2, 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, China.
Journal of hazardous materials
|June 15, 2024
概括
在废弃活性污泥 (WAS) 中长期存在的表面活性剂和纳米粒子通过影响微生物群落及其代谢来抑制挥发性脂肪酸 (VFA) 的产生. 这影响了厌氧发酵,这对生物气体产生至关重要.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生物技术是生物技术.
背景情况:
- 废弃活性污泥 (WAS) 通常含有与表面活性剂和纳米粒子 (NP) 等同时存在的污染物.
- 这些污染物对WAS无氧发酵的长期影响尚不清楚.
- 了解这些影响对于优化污泥处理和资源回收至关重要.
研究的目的:
- 为了研究同时出现的表面活性剂和NP (Fe2O3,CeO2) 对WAS无氧发酵的时间依赖性影响.
- 阐明潜在的机制,包括微生物群落的转移和代谢功能变化.
- 确定影响挥发性脂肪酸 (VFA) 生物合成的关键因素.
主要方法:
- 与表面活性剂和NP (Fe2O3,CeO2) 的共同培养实验.
- 随着时间的推移,监测挥发性脂肪酸 (VFA) 产量.
- 微生物社区结构 (16S rRNA测序) 和代谢功能 (基因表达) 的分析.
- 部分最小平方路径建模 (PLS-PM) 用于机制分析.
主要成果:
- 同时出现的表面活性剂和NP最初抑制了VFA生物合成和关键发酵过程.
- 由于发酵系统崩,VFA产量在后期阶段 (72d) 显著下降 (48.5971.27%) .
- 微生物社区结构发生了转变,关键类型从酸菌变为病菌.
- 代谢功能,包括细胞内代谢 (proB),由于微生物适应能力降低 (定数感应) 而下调.
结论:
- 表面活性剂和NP的同时存在对WAS无氧发酵有显著的时间依赖的负面影响.
- 微生物群体的结构和功能,特别是定数感应,是VFA生成的关键决定因素.
- 这些发现为加强生物气生产的WAS处理中的污染物管理提供了关键的见解.
相关概念视频
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...
Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...


