The impact of temperature and gas-phase oxygen on kinetics of in situ ammonia removal in bioreactor landfill leachate
| Autor: | Timothy G. Townsend, Debra R. Reinhart, Nicole D. Berge, John D. Dietz |
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| Rok vydání: | 2007 |
| Předmět: |
Environmental Engineering
Denitrification chemistry.chemical_element Oxygen Ammonia chemistry.chemical_compound Bioreactors Monod equation Bioreactor Leachate Waste Management and Disposal Water Science and Technology Civil and Structural Engineering Bioreactor landfill Ecological Modeling Temperature Environmental engineering Pollution Refuse Disposal Kinetics chemistry Environmental chemistry Nitrification Gases Water Pollutants Chemical |
| Zdroj: | Water Research. 41:1907-1914 |
| ISSN: | 0043-1354 |
| Popis: | Microcosm experiments aimed at defining a rate equation that describes how different environmental conditions (i.e., gas-phase oxygen concentrations, temperature and ammonia concentration) may impact in situ ammonia removal were conducted. Results indicate that ammonia removal can readily occur at various gas-phase oxygen levels (between 0.7% and 100%) and over a range of temperatures (22, 35 and 45 °C). Slowest rates occurred with lower gas-phase oxygen concentrations. All rate data, except at 45 °C and 5% oxygen, fit well ( r 2 =0.75) to a multiplicative Monod equation with terms describing the impact of oxygen, pH, temperature and ammonia concentration. All ammonia half-saturation values are relatively high when compared to those generally found in wastewater treatment, suggesting that the rate may be affected by the mass transfer of oxygen and/or ammonia. Additionally, as the temperature increases, the ammonia half-saturation value also increases. The multiplicative Monod model developed can be used to aid in designing and operating field-scale studies. |
| Databáze: | OpenAIRE |
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