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Sorption of distillery spent wash onto fly ash: Kinetics, mechanism, process design and factorial design

Publication Type : Journal Article

Publisher : Journal of Hazardous Materials

Source : Journal of Hazardous Materials, Volume 161, Number 2–3, p.1313 - 1322 (2009)

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Keywords : Process design

Campus : Coimbatore

School : School of Engineering

Department : Chemical

Year : 2009

Abstract : Batch and continuous experiments were performed for the sorption of distillery spent wash onto fly ash particles. The Freundlich and pseudo-second order equation were found to fit the equilibrium data perfectly. The Weber–Morris intraparticle diffusion isotherm equation was used to predict the sorption mechanism and the predicted equation for 10% dilution of spent wash sorption is qt = 1.1344t0.5 + 33.304. The optimization using 23 factorial design of experiments provides optimal removal of color of 93% for dilution (5%), dosage of adsorbent (10 g) and temperature (293 K). The actual color removal at optimal conditions was 92.24%, confirms close to the factorial design results. The complete error analysis using six non-linear error functions: Chi-square (χ2); sum of square errors (SSE); composite fractional error function (HYBRD); derivative of Marquardt's percent standard deviation (MPSD); average relative error (ARE); sum of absolute errors (EABS) were calculated. Free energy of adsorption at 293 K (ΔG0 = −1574.67 J), enthalpy change (ΔH0 = −32.5487 KJ) and entropy change (ΔS0 = 105 J/K) were calculated to predict the nature of adsorption. Adsorption studies in a packed column were evaluated using Bed depth service time model, Thomas model and Adams–Bohart model.

Cite this Research Publication : K. R. Prasad and Srivastava, S. N., “Sorption of distillery spent wash onto fly ash: Kinetics, mechanism, process design and factorial design”, Journal of Hazardous Materials, vol. 161, pp. 1313 - 1322, 2009.

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