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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...

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Updated: Oct 30, 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

[Two-Stage Denitrification Process Performance with Solid Slow-Release Carbon Source].

Yi Tang¹, Yong-Wen Ma^1,2, Jin-Quan Wan^1,2

¹School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.

Huan Jing Ke Xue= Huanjing Kexue

|July 2, 2021

Summary

This summary is machine-generated.

Adding polybutylene succinate (PBS) to wastewater treatment enhances biological denitrification. This improves total nitrogen removal by providing a carbon source and microbial habitat, boosting denitrifying bacteria abundance.

Keywords:

C/N denitrification microbial community solid slow-release carbon source two-stage denitrification

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Area of Science:

Environmental Engineering
Microbiology
Water Treatment

Background:

Excessive nitrate nitrogen (NO3--N) in wastewater effluent causes high total nitrogen (TN).
Increasing the carbon to nitrogen ratio (C/N) with external carbon sources strengthens biological denitrification.

Purpose of the Study:

To evaluate the effectiveness of polybutylene succinate (PBS) as an external carbon source in a two-stage denitrification reactor.
To analyze the impact of PBS addition on microbial community structure and denitrification performance.

Main Methods:

Utilized an integrated denitrification reactor based on a two-stage process.
Characterized PBS materials using scanning electron microscopy.
Analyzed microbial community structure changes via amplicon sequencing before and after PBS addition.

Main Results:

Total nitrogen (TN) removal rate increased from 51.8% to 80%.
Relative abundance of Proteobacteria increased from 36.1% to 46.1%, and Thermomonas from 6.47% to 13.48%.
PBS addition enhanced biofilm formation and increased denitrifying bacteria abundance.

Conclusions:

Polybutylene succinate (PBS) effectively serves as a carbon source and microbial carrier in denitrification.
PBS addition significantly improves denitrification performance and total nitrogen removal during wastewater treatment.
The study demonstrates a viable method for enhancing biological denitrification processes.