Wind-Driven Surficial Oxygen Transfer and Dinitrogen Gas Emission from Treatment Lagoons
| Autor: | Patrick G. Hunt, Kyoung S. Ro, M. E. Poach |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Environmental Engineering
Denitrification Nitrogen chemistry.chemical_element Wind Waste Disposal Fluid Oxygen Ammonia chemistry.chemical_compound Animal Husbandry Air Pollutants Environmental engineering General Medicine Metabolic pathway Waste treatment chemistry Environmental chemistry Nitrification Adsorption Gases Volatilization Stoichiometry Environmental Monitoring |
| Zdroj: | Journal of Environmental Science and Health, Part A. 41:1627-1638 |
| ISSN: | 1532-4117 1093-4529 |
| Popis: | Surficial oxygen transfer plays an important role, when analyzing the complex biochemical and physical processes responsible for ammonia and dinitrogen gas emission in animal waste treatment lagoons. This paper analyzes if currently known nitrogen biochemical pathways can explain the enigmatic dinitrogen gas emissions recently observed from the treatment lagoons, based on the amount of wind-driven oxygen that can be transferred through the air-water interface. The stoichiometric amounts of the maximum dinitrogen gas production potential per unit mass of O(2) transferred were calculated according to three most likely biochemical pathways for ammonia removal in the treatment lagoons-classical nitrification-denitrification, partial nitrification-denitrification, and partial nitrification-Anammox. Partial nitrification-Anammox pathway would produce the largest N(2) emission, followed by partial nitrification-denitrification pathway, then by classical nitrification-denitrification pathway. In order to estimate stoichiometric amount (i.e., maximum) of N(2) emission from these pathways, we assumed that heterotrophic respiration was substantially inhibited due to high levels of free ammonia prevalent in treatment lagoons. Most observed N(2) emission data were below the maximum N(2) emission potentials by the classical nitrification-denitrification pathway. However, one value of observed N(2) emission was much higher than that could be produced by even the partial nitrification-Anammox pathway. This finding suggests yet unknown biological processes and/or non-biological nitrogen processes such as chemodenitrification may also be important in these treatment lagoons. |
| Databáze: | OpenAIRE |
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