| ENVIRONMENTAL SCIENCE AND ENGINEERING |
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Adsorption of ammonia-nitrogen on ion exchange resins |
| YANG Shaoxia1, ZHANG Jingjing1, YANG Hongwei2, ZHANG Li1, GAO Pan1 |
1. School of Renewable Energy, North China Electric Power University, Beijing 102206, China;
2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract The adsorption of ammonia-nitrogen on a macro-reticular weak acid resin (D113) with a strong acid resin (001×7) was analyzed experimentally to identify the thermodynamics and kinetics of the absorption process. The result showed that: 1) increasing resin concentrations increased the ammonia removals of the two resins even though the adsorption rate decreased; 2) a basic solution increased the adsorption capacity of the two resins, and 3) the adsorption capacity of the two resins increased with temperature. The adsorption isotherm of two resin combination was fit with the Langmuir adsorption model with the kinetics close a pseudo-second equation. The process of ammonia adsorption on the resins was a spontaneous, endothermic reaction with increasing entropy.
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| Keywords
ion exchange resins
ammonia-nitrogen
adsorption
thermodynamics
kinetics
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Issue Date: 15 June 2015
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2015,
Vol. 55
