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Related Concept Videos

Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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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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Inorganic Nitrogen Assimilation01:22

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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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The Nitrogen Cycle01:49

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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...
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Metabolism of Chemolithotrophs01:15

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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.
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Bioremediation00:46

Bioremediation

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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.
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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.
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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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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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Nitrogen Attenuation in Septic System Plumes.

William D Robertson1, Dale R Van Stempvoort2, Sherry L Schiff1

  • 1Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada.

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|December 14, 2020
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Summary
This summary is machine-generated.

Septic systems in Ontario frequently contaminate groundwater with nitrate, exceeding drinking water limits. Enhancing nitrogen removal in septic systems may involve designing for less wastewater oxidation, potentially utilizing the anammox reaction.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Wastewater Treatment

Background:

  • Septic systems are a common source of nitrogen pollution in groundwater.
  • Nitrate contamination of drinking water poses significant environmental and health risks.
  • Understanding nitrogen persistence and removal in septic plumes is crucial for water resource management.

Purpose of the Study:

  • To assess the long-term persistence of inorganic nitrogen in septic system plumes.
  • To quantify nitrogen removal efficiency within drainfield and downgradient plume zones.
  • To identify factors influencing nitrogen removal and explore strategies for enhanced N removal.

Main Methods:

  • Analysis of inorganic nitrogen (nitrate and ammonium) in groundwater from 21 septic system plumes in Ontario over 31 years (1988-2019).
  • Calculation of nitrogen removal percentages in drainfield and downgradient plume zones.
  • Correlation analysis of nitrogen removal with wastewater loading, system age, water table depth, and sediment characteristics.

Main Results:

  • Nitrate concentrations frequently exceeded the drinking water limit (10 mg N/L) in both drainfield and downgradient plume zones.
  • Average total inorganic nitrogen removal was 34% in drainfield zones and 36% in downgradient zones, with higher removal (>60%) when ammonium was abundant.
  • Nitrogen removal was negatively correlated with water table depth, indicating less efficient oxidation in shallower conditions. The anammox reaction likely contributed to nitrogen loss.

Conclusions:

  • Septic system plumes represent a persistent source of groundwater nitrate contamination.
  • Nitrogen removal is significant but variable, influenced by factors like ammonium presence and water table depth.
  • Designing septic systems for reduced wastewater oxidation may enhance nitrogen removal and mitigate groundwater contamination.