添加硫化物加快了亚纳摩克斯污泥的颗粒化,并促进了微生物的合作
Tong Wang1, Han Wang1, Zibin Li1
1State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai 200092, PR China.
Water research
|October 17, 2024
概括
添加硫化物通过促进污泥直径和heme c.含量来改善颗粒无氧氨氧化 (anammox) 污泥的性能. 这提高了废水处理中的去除效率和系统稳定性.
科学领域:
- 环境微生物学 环境微生物学
- 废水处理工程 废水处理工程
- 生物地质化学生物地质化学
背景情况:
- 颗粒无氧氨氧化 (anammox) 系统提供高效的去除与环境应激耐受性.
- 添加硫化物可以通过硫脱增强的去除,但它对anammox污泥性能的影响还不太清楚.
研究的目的:
- 研究不同硫化物度对anammox颗粒污泥的形态和微生物特性的影响.
- 阐明硫化物影响污泥特性和去除性能的机制.
主要方法:
- 长期实验使用anammox系统进行,并添加受控的硫化物 (10-100 mg/L).
- 分析了泥形态 (直径) 和生化指标 (血含量).
- 评估了微生物社区结构和代谢功能.
- 评估了去除的效率和污泥对环境压力的耐受性.
主要成果:
- 低硫化物度 (S/N 摩尔比为 0.18-0.50) 显著增加了污泥直径 (25-175%) 和血度 (75-95%).
- 硫化物刺激了细胞外聚合物物质的分泌,生物硫的积累和细菌的生长.
- 建立了一个强大的微生物群落,其中主导的是体细菌 (Candidatus_Brocadia) 和硫氧化细菌 (Thiobacillus).
- 在硫化物介导系统中,去除效率超过95%.
结论:
- 添加硫化物,特别是在低度下,有效地改善了anammox颗粒污泥的形态特性.
- 硫化物为功能性微生物创造了有利的利基,提高了anammox过程的效率和稳定性.
- 在硫化物介导系统中,anammox和硫氧化细菌之间的协同相互作用是高去除性能的关键.
相关概念视频
01:20Sulfur Assimilation
1
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
1
02:26Preparation and Reactions of Sulfides
4.7K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.7K
01:09Colloidal precipitates
521
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
521
01:15Metabolism of Chemolithotrophs
2
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
2
01:06Coagulation
273
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
273
01:19Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
182
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
182