| Supercritical water oxidation of landfill leachate. | |
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MedLine Citation:
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PMID: 21705208 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In this paper, ammonia as an important ingredient in landfill leachate was mainly studied. Based on Peng-Robinson formulations and Gibbs free energy minimization method, the estimation of equilibrium composition and thermodynamic analysis for supercritical water oxidation of ammonia (SCWO) was made. As equilibrium is reached, ammonia could be totally oxidized in SCW. N(2) is the main product, and the formation of NO(2) and NO could be neglected. The investigation on SCWO of landfill leachate was conducted in a batch reactor at temperature of 380-500°C, reaction time of 50-300s and pressure of 25MPa. The effect of reaction parameters such as oxidant equivalent ratio, reaction time and temperature were investigated. The results showed that COD and NH(3) conversion improved as temperature, reaction time and oxygen excess increased. Compared to organics, NH(3) is a refractory compound in supercritical water. The conversion of COD and NH(3) were higher in the presence of MnO(2) than that without catalyst. The interaction between reaction temperature and time was analyzed by using response surface method (RSM) and the results showed that its influence on the NH(3) conversion was relatively insignificant in the case without catalyst. A global power-law rate expression was regressed from experimental data to estimate the reaction rate of NH(3). The activation energy with and without catalyst for NH(3) oxidation were 107.07±8.57kJ/mol and 83.22±15.62kJ/mol, respectively. |
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Authors:
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Shuzhong Wang; Yang Guo; Chongming Chen; Jie Zhang; Yanmeng Gong; Yuzhen Wang |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-24 |
Journal Detail:
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Title: Waste management (New York, N.Y.) Volume: - ISSN: 1879-2456 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9884362 Medline TA: Waste Manag Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011. Published by Elsevier Ltd. |
Affiliation:
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School of Energy and Power Engineering of Xi' an Jiao Tong University, Xi'an 710049, PR China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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