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Removal of melanoidin from molasses spent wash using fly ash-clay adsorbents

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Abstract

Removal of melanoidin pigment from molasses spent wash was investigated using a new adsorbent. Solid adsorbents were fabricated from charcoal fly ash and clay. The effect of various molasses concentration (6 to 12 g/l) on removal efficiency was studied. The obtained results revealed that maximum removal efficiency of 82% was achieved at the molasses concentration of 6 g/l and contact time of 7 h. The saturated porous adsorbents were regenerated and reused to conduct similar experiments. The achieved data showed that more than 90% of the capacity of the fresh adsorbent was recovered after regeneration. Various adsorption isotherms of Langmuir, Freundlich, Temkin and Harkins-Jura were applied to interpret the obtained experimental data. The obtained results revealed that the sorption data were well described by the Harkins-Jura model. Also, various kinetic models of pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion were used to predict the characteristic parameters which are useful in process design. It was concluded that the best fit was obtained with pseudo-second order kinetic model at low molasses concentrations.

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Authors and Affiliations

  1. Faculty of Chemical Engineering, Islamic Azad University of Shahrood Branch, Shahrood, Iran

    Ali Ramezani

  2. Faculty of Chemical Engineering, Noushirvani University of Technology, Babol, Iran

    Ghasem Najafpour Darzi & Maedeh Mohammadi

Authors
  1. Ali Ramezani
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  2. Ghasem Najafpour Darzi
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  3. Maedeh Mohammadi
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Correspondence to Ghasem Najafpour Darzi.

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Ramezani, A., Darzi, G.N. & Mohammadi, M. Removal of melanoidin from molasses spent wash using fly ash-clay adsorbents. Korean J. Chem. Eng. 28, 1035–1041 (2011). https://doi.org/10.1007/s11814-010-0474-2

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  • DOI: https://doi.org/10.1007/s11814-010-0474-2

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