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Related Concept Videos

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...
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Published on: October 7, 2020

Model-based process analysis of partial nitrification efficiency under dynamic nitrogen loading.

Didem Güven1, Ozgül Kutlu, Güçlü Insel

  • 1Faculty of Engineering, Environmental Engineering Department, Fatih University, 34500, Büyükçekmece-Istanbul, Turkey. dguven@fatih.edu.tr

Bioprocess and Biosystems Engineering
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

This study optimized partial nitrification for high ammonia wastewater treatment. A chemostat reactor significantly enhanced ammonium oxidizer activity, achieving a 2.8-fold higher oxidation rate for efficient ammonia removal.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • High ammonia concentrations in wastewater pose environmental challenges.
  • Partial nitrification is a key process for ammonia removal.
  • Optimizing nitrifier communities is crucial for efficient treatment.

Purpose of the Study:

  • To evaluate ammonia removal efficiency in high ammonia wastewater using partial nitrification.
  • To enrich and enhance nitrifier biocommunity activity.
  • To determine critical operational parameters for partial nitrification.

Main Methods:

  • Enrichment of nitrifier biocommunity in a fill-and-draw batch reactor.
  • Establishment of partial nitrification in a chemostat.
  • Determination of critical hydraulic retention time (HRT) and sludge retention time (SRT).
  • Dynamic modeling to assess ammonium oxidizer growth rates and recovery periods.

Main Results:

  • A nitrifier biocommunity with a specific ammonium oxidation rate of 0.1 mg NH(4)(-)-N/mg VSS.h was enriched.
  • Partial nitrification was established in a chemostat with a critical HRT (SRT) of 1.0 day.
  • A maximum specific ammonium oxidation rate of 0.280 mg NH(4)(-)-N/mg VSS.h was achieved, 2.8-fold higher than in the batch reactor.
  • Dynamic modeling indicated a maximum growth rate for ammonium oxidizers of 1.22 day(-1) and a recovery period of 10 days.

Conclusions:

  • Chemostat operation effectively enriched highly active ammonium oxidizers for enhanced partial nitrification.
  • The study identified critical operational parameters (HRT/SRT) for efficient ammonia removal.
  • Dynamic modeling provides valuable insights into nitrifier behavior and system recovery.