合依赖酸盐的无氧乙降解与无氧氧化
Xiawei Liu1, Mengxiong Wu1, Jianhua Guo1
1Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, Queensland 4072, Australia.
Environmental science & technology
|June 20, 2024
概括
这项研究将依赖酸盐的无氧乙氧化与anammox细菌结合起来,以去除乙和. 通过控制乙水平,可以实现稳定的去除,显著提高了酸盐减少率.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 厌氧氧化过程 厌氧氧化过程
背景情况:
- 短链气态 (SCGAs) 导致空气污染和气候变化.
- 酸盐依赖性厌氧乙氧化 (n-DAEO) 通过"候选食者酸"提供了一种缓解途径.
- 从n-DAEO中积累的亚酸盐可以抑制微生物活动; 亚纳摩克斯细菌可以消耗这种亚酸盐.
研究的目的:
- 在实验室系统中证明n-DAEO与anammox细菌的合.
- 为了防止酸盐的积累,并提高SCGA的去除效率.
- 为了研究n-DAEO和anammox细菌之间的同相互作用.
主要方法:
- 开发一个实验室规模的模型系统合n-DAEO和anammox.
- 对乙度进行可控操纵以优化微生物活动.
- 用于微生物社区概况的16S rRNA基因扩增子测序.
主要成果:
- 高度的乙 (>6.9%) 抑制了阿纳莫克斯的活性.
- 在1.7-5.5%的乙度下实现了稳定的合,使得乙和氨同时氧化.
- 与单独的n-DAEO相比,酸盐减少率在合系统中增加了8.1倍.
- "Ca. A. nitratireducens"和"Candidatus Kuenenia"是占主导地位的,这表明它们之间存在一种合成的伙伴关系.
结论:
- 将n-DAEO与anammox相结合是有效去除乙和的可行策略.
- 精心控制基质度对于成功的工艺集成至关重要.
- 这些发现突出了潜在的交叉食相互作用,有利于在无氧环境中去除.
相关概念视频
Overview of Nitrogen Metabolism
7.9K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.9K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
Catalysis
26.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
26.9K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
Preparation of Amines: Alkylation of Ammonia and Amines
3.3K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.3K
2° Amines to N-Nitrosamines: Reaction with NaNO2
4.2K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
4.2K


