Chemical Regeneration of Exhausted Granular Activated Carbon Used in Citric Acid Fermentation Solution Decoloration

Document Type: Research Article

Authors

Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, CHINA

Abstract

An improved chemical regeneration of the granular activated carbon (GAC) exhausted by the color (pigments and pollutants) from citric acid fermentation solution (CAF) was investigated. In the experiments, improved means were adopted to advance the traditional chemical regenerating method and the adsorption capacity of the first time renewed GAC is 103% of original GAC. Using oxidant and surfactant in addition to just using NaOH solution can recover 10 % more adsorption capacity of renewed GAC. The adding dosage of oxidant is good at 3 % of exhausted GAC weight; that of surfactant is good at 0.1 %. Hot water as cheap reagent was found to be much helpful to the regeneration efficiency. Comparing with steam regeneration high regeneration yield (>95 %) of this method was an attractive economic factor. The result of this investigation can offer an advanced chemical regeneration method to regenerate exhausted GAC from citric acid refine industry.

Keywords

Main Subjects


[1] Tsai, WT., Chang, CY., Lee, SL., Preparation and Characterization of Activated Carbons from Corn Cob., Carbon, 35, 1198 (1997).
[2] Yanping  Guo,  David, A. Rockstraw, Activated Carbons Prepared from Rice Hull by One-Step Phosphoric Acid Activated, Microporous and Mesoporos Materials, 100, 112 (2007).
[3] Jun’ichi Hayshi, Toshihide Horikawa, Isao Takeda, Katsuhiko Muroyama, Fard Nasir Ani, Preparing Activated Carbon from Various Nutshells by Chemical Activation with K2CO3, Carbon, 40, 2381 (2002).
[4] Haykiri-Acma, H., Yaman S., Kucuk Bayrak, S., Gasification of Biomass Char in Steam-Nitrogen Mixture, Energy Conversion and Management, 47, 1004 (2006).
[5] Ahmedna, M., Marshall, WE., Rao, RM., Production of Granular Activated Carbons from Select Agricultural By-Products and Evaluation of their Physical, Chemical and Adsorption Properties, Bioresource Technol, 71, 113 (2000).
[6] Zhang, T.Y., Walawender, W.P., Fan, L.T. (Eds.), Preparation of Activated Carbon from Forest and Agricultural Residues through CO2 Activation, Chem. Eng. J., 105, 53 (2004).
[7] Yang, T., Lua, A.C., Characteristics of Activated Carbons Prepared from Pistachio-Nut Shells by Physical Activation, J. Colloid Interf. Sci., 267, 408 (2003).
[8] Wang, Z.G., Jiang, J.C. (Eds.), Study on the Technology of Manufacturing Granular Activated Carbon from Sawdust for Decolorization of Liquid, Chemistry and Industry of Forest Products, 25, 39 (2005).
[9] Oin, Y.C., Wang, H.T., Zhu, H.Z., Regeneration Methods of Activated Carbon, Carbon Techniques, 117, 29 (2001).
[10] Liu,  S.X.,  Wang,  Y.,  Zhang,  W.C.,  Progress  in Activated Carbon Regeneration, Carbon Techniques, 29, 61 (2001).
[11] Martin, R.J., Ng, W.J., Chemical Regeneration of Exhausted Activated Carbon-I, Water Res., 18, 59 (1984).
[12] Guymont, F. J., The Effect of Capital and Operating Costs on GAC Adsorption System Design, Activated Carbon Adsorption of Organics from the Aqueous Phase[C], McGuire M J., et al. Annabor Science, Ann Abrbor, MI, (1980).
[13] Kang  Sun,  Study  on  Liquid-Phase  Adsorption Behavior and Chemical Regeneration Mechanism of GAC [D], Nanjing: Institute of Chemical Industry of Forest Products, CAF, 39, (2006).
[14] Niu,  J.N.,  Influence  of  Time  and T emperature During Thermal Regeneration, China Water and Wastewater, 10, 40 (1994).