Modeling transport kinetics in clinoptilolite-phosphate rock systems
Nutrient release in clinoptilolite-phosphate rock (Cp-PR) systems occurs through dissolution and cation-exchange reactions. Investigating the kinetics of these reactions expands our understanding of nutrient release processes. Research was conducted to model transport kinetics of nutrient release...
| Publié dans: | Soil Science Society of America journal. Soil Science Society of America. - 1990. - 59(1995), 1 vom: 14. Jan., Seite 248-55 |
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| Auteur principal: | |
| Autres auteurs: | , , |
| Format: | Article |
| Langue: | English |
| Publié: |
1995
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| Accès à la collection: | Soil Science Society of America journal. Soil Science Society of America |
| Sujets: | Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. NASA Center JSC NASA Discipline Life Support Systems NASA Discipline Number 61-10 NASA Program CELSS Cation Exchange Resins Culture Media Fertilizers plus... |
| Résumé: | Nutrient release in clinoptilolite-phosphate rock (Cp-PR) systems occurs through dissolution and cation-exchange reactions. Investigating the kinetics of these reactions expands our understanding of nutrient release processes. Research was conducted to model transport kinetics of nutrient release in Cp-PR systems. The objectives were to identify empirical models that best describe NH4, K, and P release and define diffusion-controlling processes. Materials included a Texas clinoptilolite (Cp) and North Carolina phosphate rock (PR). A continuous-flow thin-disk technique was used. Models evaluated included zero order, first order, second order, parabolic diffusion, simplified Elovich, Elovich, and power function. The power-function, Elovich, and parabolic-diffusion models adequately described NH4, K, and P release. The power-function model was preferred because of its simplicity. Models indicated nutrient release was diffusion controlled. Primary transport processes controlling nutrient release for the time span observed were probably the result of a combination of several interacting transport mechanisms |
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| Description: | Date Completed 30.01.1997 Date Revised 27.10.2019 published: Print Citation Status MEDLINE |
| ISSN: | 0361-5995 |