• Treatment of Melamine by GAC Adsorption According to Adsorbent Size: Kinetics and Dispersion-Diffusion
  • Lee, Jai-Yeop;Lee, Sangjung;Han, Ihnsup;
  • Dept. of Environmental Engineering, Graduate School, University of Seoul;Research Center for Environmental Quality Management, Kyoto University;Dept. of Environmental Engineering, Graduate School, University of Seoul;
  • 흡착제 크기에 따른 GAC의 멜라민 흡착 처리 : 반응속도와 분산-확산
  • 이재엽;이상중;한인섭;
  • 서울시립대학교 환경공학과 대학원;교토대학 환경 품질 경영을 위한 연구센터;서울시립대학교 환경공학과 대학원;
Abstract
Adsorption of melamine was examined using columns packed with granular activated carbon (GAC). Raw GAC was sieved with 20, 40, 60 and 80 mesh to determine the influence of adsorbent particle size on reaction and diffusion. The mass ratio of the adsorption capacity of GAC for melamine ranged from 9.19 to 11.06%, and adsorption rates increased with decreasing particle size within this range. Rate constants between 3.295 ~ 4.799 $min^{-1}$ were obtained using a pseudofirst-order equation that was used to determine adsorption kinetics. A surface diffusion model was adapted to take into account the unsteady-state equation of a spherical adsorbent by converting the surface concentration from a constant to a variable governed by a dispersion equation. The calculated values were fit with the experimental results by using the diffusion coefficients as regression parameters. The modified equation exhibited a more precise agreement with respect to the sum of the absolute error (SAE).

Keywords: Melamine;Adsorption;GAC;Surface diffusion;Crank's diffusion equation;

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This Article

  • 2013; 18(3): 65-72

    Published on Jun 30, 2013

  • 10.7857/JSGE.2013.18.3.065
  • Received on Mar 20, 2013
  • Revised on May 8, 2013
  • Accepted on May 9, 2013