Application of equilibrium and mass transfer models to dynamic removal of Cr(VI) ions by Chitin in packed column reactor

被引:79
作者
Sag, Y [1 ]
Aktay, Y [1 ]
机构
[1] Univ Hacettepe, Fac Engn, Dept Chem Engn, TR-06532 Ankara, Turkey
关键词
sorption; chitin; chromium; packed column reactor; equilibrium isotherms; mass transfer models;
D O I
10.1016/S0032-9592(01)00150-9
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The dynamic removal of hexavalent chromium by chitin flakes was studied in a packed column reactor. The values of column parameters were predicted as a function of flow rate, bed depth, particle size and inlet metal ion concentration. On evaluating the breakthrough curves, sorption isotherms were obtained and modelled according to the Langmuir, the Redlich-Peterson and the Freundlich models. Kinetic and mass transfer aspects of the dynamic removal of Cr(VI) ions by chitin were investigated using several mathematical models. Column studies showed a good correlation between the experimental data and the calculated breakthrough curves obtained by the Adams-Bohart or the Wolborska models and the Clark model. The simulation of the whole breakthrough curve was effective with the Clark model, but the breakthrough was best predicted by Adams-Bohart. or related derived models. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1187 / 1197
页数:11
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