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Related Concept Videos

Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

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. However, because inorganic electron donors...
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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 nitrate reductase...
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...
The Nitrogen Cycle01:49

The Nitrogen Cycle

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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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Related Experiment Video

Updated: May 21, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

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

[Research progress in anammox-denitrification coupling process].

Xiao-Xiao Huang1, Chong-Jun Chen, Rui Zhang

  • 1College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China. huang_xx@zju.edu.cn

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|June 23, 2012
PubMed
Summary

Anammox and denitrification can be coupled to remove high ammonium and organic carbon from wastewater. This review covers mechanisms, microbes, and factors influencing this combined nitrogen removal process.

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Last Updated: May 21, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

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

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities

Published on: December 25, 2015

Area of Science:

  • Nitrogen cycle biochemistry
  • Microbial ecology in wastewater treatment

Context:

  • Anammox (anaerobic ammonium oxidation) is crucial for nitrogen removal but inhibited by organic carbon.
  • Wastewater often contains both high ammonium and organic carbon, posing treatment challenges.

Purpose:

  • To review the mechanisms, microbial communities, and operational factors of coupled anammox-denitrification.
  • To discuss the initiation, control, and environmental influences on this combined process.

Summary:

  • Anammox-denitrification coupling leverages specific microbial groups to simultaneously remove ammonium and organic carbon.
  • Key factors affecting the coupled process include organic carbon source, pH, temperature, and microbial community structure.
  • This review synthesizes current knowledge on the process, its challenges, and optimization strategies.

Impact:

  • Provides a comprehensive overview for researchers and engineers in wastewater treatment.
  • Highlights the potential of anammox-denitrification for efficient simultaneous nitrogen and carbon removal.
  • Identifies future research directions and practical applications for sustainable wastewater management.