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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Related Experiment Video

Updated: Nov 9, 2025

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Research progress in solid carbon source-based denitrification technologies for different target water bodies.

Feifan Zhang1, Chengjin Ma1, Xiangfeng Huang1

  • 1College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, People's Republic of China.

The Science of the Total Environment
|April 11, 2021
PubMed
Summary
This summary is machine-generated.

Solid carbon sources (SCSs) offer effective nitrogen removal from water through denitrification. Synthetic SCSs generally outperform natural ones, with optimal application varying by water body type.

Keywords:
Heterotrophic denitrificationNitrogen pollutionNitrogen removalSolid carbon sourceWater treatment

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Area of Science:

  • Environmental Science and Engineering
  • Water Quality Management
  • Microbial Ecology

Background:

  • Nitrogen pollution poses a significant environmental threat to water bodies.
  • Heterotrophic denitrification is a key biological treatment method.
  • Solid carbon sources (SCSs) are increasingly utilized for their gradual carbon release and operational advantages.

Purpose of the Study:

  • To review and compare different types and properties of SCSs for water denitrification.
  • To analyze the application of SCS-based denitrification across various water bodies.
  • To identify key research considerations specific to each target water body.

Main Methods:

  • Literature review of natural (e.g., wheat straw, wood chips) and synthetic (e.g., polybutylene succinate, polylactic acid) SCSs.
  • Analysis of SCS performance in treating wastewater, aquaculture systems, agricultural drainage, surface water, and groundwater.
  • Examination of critical parameters influencing denitrification efficiency in different aquatic environments.

Main Results:

  • Synthetic SCSs generally demonstrate superior denitrification performance compared to natural SCSs.
  • Optimal SCS application and research focus vary significantly based on the target water body.
  • Key factors include nitrogen removal rate, byproduct accumulation, water quality, temperature, hydraulic retention time, and carbon source dosage.

Conclusions:

  • Solid carbon source-based denitrification is a highly promising and effective technique for mitigating nitrate-nitrogen pollution.
  • Tailoring SCS selection and operational parameters to specific water bodies is crucial for maximizing treatment efficiency.
  • Further research into optimizing SCS application across diverse aquatic environments is warranted.