在anammox反应堆中,温度对去除和N2O排放的影响
Xiaolong Yu1, Fumitake Nishimura2, Taira Hidaka3
1College of Environment and Resources, Xiangtan University, Xiangtan 411105, China; School of Environmental Science and Engineering, Southern University of Science and Technology, No.1088, Xueyuan Road, Nanshan District, Shenzhen 518055, China.
Bioresource technology
|December 28, 2024
概括
附加生长的anammox反应器表现出对低温的弹性,但在高温下性能降低. 最佳的去除与低氧化 (N2O) 排放发生在35°C,突出温度.
科学领域:
- 环境微生物学环境微生物学
- 废水处理技术 废水处理技术
- 温室气体排放量排放量 温室气体排放量
背景情况:
- 主流的anammox工艺与温度波动和氧化 (N2O) 排放作斗争.
- 附加生长系统在废水处理中提供了增强微生物稳定的潜力.
研究的目的:
- 调查快速温度变化 (15-55°C) 对附加生长型anammox反应堆中去除和N2O排放的影响.
- 为了确定anammox工艺效率和最小温室气体排放的最佳温度范围.
主要方法:
- 使用的附加生长的anammox反应器受到从15°C到55°C的控制温度变化.
- 在不同的热条件下监控的去除率和量化N2O排放.
- 分析了anammox细菌种群和总体生物活性,以应对温度压力.
主要成果:
- 在较低的温度 (15-25°C) 中,去除率保持不变,但在较高的温度 (45-55°C) 中,由于降低了anammox生物质和生物活性,其去除率显著下降.
- 在35°C运行的反应堆显示了最低的N2O排放 (<1.0 mgN/L·d)).
- 在15°C (大约15°C) 时观察到高氧化物排放量 (N2O). 5.0 mgN/L·d) 和55°C (大约) 的温度. 3.4 mgN/(L·d)),归因于并发的脱化.
结论:
- 附着生长的anammox工艺表现出不同的温度适应性,在40°C以上的温度下性能降低.
- 温度管理对于减轻N2O排放至关重要,35°C被确定为有利的操作点.
- 这些发现支持通过考虑热弹性和温室气体管理来优化主流的anammox应用.
相关概念视频
Metabolism of Chemolithotrophs
1
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.
1
2° Amines to N-Nitrosamines: Reaction with NaNO2
4.0K
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.
4.0K
Overview of Nitrogen Metabolism
7.8K
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...
7.8K
Free Energy Changes for Nonstandard States
10.9K
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
10.9K
The Equilibrium Constant
46.6K
Consider the oxidation of sulfur dioxide:
46.6K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.2K
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...
3.2K


