相关实验视频

Updated: May 14, 2025

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

活性污泥微生物组的转变与酸盐积累和高氧化排放相关

Oona Kinnunen¹, Antonina Kruglova¹, Marlene Mark Jensen²

¹Department of Built Environment, Aalto University, PO Box 15200, FI-00076 AALTO, Finland.

Environmental research

|April 12, 2025

概括

污水处理厂 (WWTP) 中微生物群落的转移与低酸盐氧化细菌 (NOB) 丰富度相关,驱动氧化 (N2O) 排放. 丢失NOB会导致酸盐的积累,从而增加氨氧化细菌 (AOB) 的N2O产量.

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:

氧化 (N2O) 排放是污水处理厂 (WWTP) 碳足迹的重要贡献者,通常与酸盐 (NO2-) 积累达到顶峰.
在WWTP中高N2O和NO2-水平背后的特定微生物驱动因素仍然不太清楚.

研究的目的:

在大量N2O排放期间,调查WWTP线路中微生物群落的差异,这些线路在大量N2O排放期间呈现高酸盐 (NO2-) 和低酸盐 (NO2-) 度.
确定与N2O生产和NO2-积累相关的关键微生物参与者.

主要方法:

在具有显著N2O排放和NO2-积累的平行WWTP线路中的微生物组的表征.
微生物社区结构的比较分析,以不同NO2水平的线条.

主要成果:

有NO2积累的线条显示,酸盐氧化细菌 (NOB) 的丰度明显较低,氨氧化细菌 (AOB) 的数量略低.
不完整的脱剂在NO2-积累线中更为丰富,而在没有NO2-的线中观察到有线状细菌和更好的形成.
氨氧化细菌 (AOB) 被怀疑是主要的N2O来源,异质性脱剂的潜在贡献.

结论:

证实NOB的损失是NO2积累的原因,导致N2O排放量增加.
特定的微生物物种需要进一步研究它们在WWTP中产生N2O的作用.
持续监测微生物群对于预测和减轻N2O排放和NO2-积累至关重要.

关键词:

安普利康测序的测序方法脱化过程中的脱.微生物社区的微生物社区.在化过程中,化氧化酸盐的细菌可以氧化酸盐.废水处理厂的废水处理厂.

更多相关视频

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

相关概念视频

Overview of Nitrogen Metabolism

Overview of Nitrogen Metabolism

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...

2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

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.

Bioremediation

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.

The Nitrogen Cycle

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...