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Related Concept Videos

Multi-Step Reactions02:31

Multi-Step Reactions

Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Microbes and the Nitrogen Cycle

The nitrogen cycle is a complex biogeochemical process critical to maintaining the balance of nitrogenous compounds in ecosystems. This cycle involves multiple microbial-mediated transformations through which nitrogen changes oxidation states, supporting essential ecological functions and contributing to plant and microbial growth.Nitrogen Fixation and AmmonificationNitrogen fixation initiates the cycle by converting inert atmospheric nitrogen (N₂) into bioavailable ammonia (NH₃), a process...
Rate-Determining Steps03:08

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
The Nitrogen Cycle01:49

The Nitrogen Cycle

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...
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...
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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 nitrogen...

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Kinetic parameters for modeling two-step nitrification and denitrification: a case study.

Ron J Latimer1, Paul Pitt, Peter Dold

  • 1Hazen and Sawyer, 5775 Peachtree Dunwoody Road, Suite D-520, Atlanta, GA 30342, USA. rlatimer@hazenandsawyer.com

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 25, 2009
PubMed
Summary
This summary is machine-generated.

Understanding kinetic parameters is crucial for accurately modeling nitrification and denitrification processes. This research highlights their importance for designing and operating wastewater treatment plants to achieve low total nitrogen (TN) effluent concentrations.

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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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10:11

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

Area of Science:

  • Environmental Engineering
  • Water Quality Management
  • Biogeochemical Processes

Background:

  • Nitrification and denitrification are key processes in wastewater treatment for nitrogen removal.
  • Accurate modeling is essential for optimizing plant design and operation to meet stringent effluent standards.
  • Low effluent total nitrogen (TN) concentrations require precise understanding of underlying microbial kinetics.

Purpose of the Study:

  • To identify the critical role of kinetic parameters in two-step nitrification and denitrification models.
  • To assess the impact of these parameters on effluent TN predictions in full-scale wastewater treatment plants.
  • To emphasize the necessity of plant calibration using historical data and detailed sampling.

Main Methods:

  • Modeling nitrification and denitrification as sequential, two-step processes.
  • Utilizing a calibrated model of a full-scale wastewater treatment plant.
  • Performing case studies to analyze the influence of key kinetic parameters on effluent outcomes.
  • Analyzing historical operational data and detailed plant sampling for model calibration.

Main Results:

  • Kinetic parameters significantly influence the prediction of effluent TN concentrations.
  • Accurate modeling of nitrite utilization is vital for achieving low effluent TN.
  • Model calibration using site-specific data is essential for reliable predictions.
  • The study demonstrated the sensitivity of effluent predictions to specific kinetic parameters.

Conclusions:

  • Kinetic parameterization is a critical factor in the accurate modeling of nitrogen removal processes.
  • Effective wastewater treatment plant design and operation for low TN effluent rely on robust kinetic models.
  • Comprehensive plant calibration and data collection are indispensable for validating and improving these models.