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Related Concept Videos

The Nitrogen Cycle01:49

The Nitrogen Cycle

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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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Diffusion01:12

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Overview of Nitrogen Metabolism01:20

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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.
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Receiver Operating Characteristic Plot01:15

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A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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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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Related Experiment Video

Updated: Feb 12, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Sediment diffusion method improves wastewater nitrogen removal in the receiving lake sediments.

Sanni L Aalto1, Jatta Saarenheimo2, Janne Ropponen3

  • 1Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä, Finland; Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland.

Water Research
|April 9, 2018
PubMed
Summary

Dispersing wastewater with sediment diffusers boosts microbial nitrate removal in lakes. This method enhances denitrification, converting nitrogen to harmless N2 without producing harmful byproducts.

Keywords:
DNRADenitrificationNitrate reductionNitrogen removalNitrous oxideWastewater

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Area of Science:

  • Environmental Microbiology
  • Aquatic Ecology
  • Wastewater Treatment Technologies

Background:

  • Sediment microbes can convert reactive nitrogen to nitrogen gas (N2), reducing nitrogen pollution in aquatic ecosystems.
  • Wastewater discharge can increase nitrogen loads, impacting water quality.
  • Optimizing wastewater dispersal may enhance natural nitrogen removal processes.

Purpose of the Study:

  • To investigate if a sediment diffuser pipe system enhances microbial nitrate reduction in lakes.
  • To assess the impact of enhanced wastewater-sediment contact on nitrogen removal efficiency.
  • To determine if the sediment diffusion method promotes complete denitrification or harmful byproducts.

Main Methods:

  • Full-scale experiments conducted at two Finnish lake sites (Keuruu and Petäjävesi).
  • Stable isotope pairing technique used to study nitrate reduction processes.
  • 3D simulation modeling to analyze wastewater-sediment interactions and environmental factors.

Main Results:

  • Nitrate reduction rates were highest at wastewater-influenced points, correlating with nitrate concentrations.
  • Complete denitrification to N2 was the dominant process, with no significant increase in nitrous oxide (N2O) or ammonium (NH4+) production.
  • Sediment diffusion enhanced wastewater-sediment contact, increasing denitrification capacity by an average of 45%.

Conclusions:

  • The sediment diffusion method effectively enhances natural denitrification in lake sediments.
  • This approach can supplement wastewater treatment plant (WWTP) nitrogen removal without increasing harmful emissions.
  • Optimized spatial allocation of wastewater discharge can improve nitrogen management in aquatic environments.