Batch and Column Removal of Total Chromium from Aqueous Solution Using Sargassum polycystum

被引:15
|
作者
Senthilkumar, R. [1 ]
Vijayaraghavan, K. [2 ]
Jegan, J.
Velan, M. [1 ]
机构
[1] Anna Univ, Dept Chem Engn, AC Coll Technol, Madras 600025, Tamil Nadu, India
[2] Natl Univ Singapore, Singapore Delft Water Alliance, Singapore 117576, Singapore
关键词
biosorption; kinetics; wastewater treatment; isotherm; breakthrough; HEXAVALENT CHROMIUM; HEAVY-METALS; WASTE-WATER; BIOSORPTION; BIOMASS; ADSORPTION; SORPTION; CR(VI); 2-PARAMETER; WASTEWATERS;
D O I
10.1002/ep.10416
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A marine brown alga, Sargassum polycystum, showed high-chromium biosorption capacity in batch and column mode of operation. The biosorbent performance was strongly influenced by equilibrium solution pH, with pH 2 as optimal condition for Cr biosorption. Isotherm experiments revealed that S. polycystum possessed a maximum chromium uptake of 69.4 mg/g at pH 2. The pseudo-second order model was found to describe the chromium kinetic biosorption data with high-correlation coefficients compared with pseudo-first order model. Various thermodynamic parameters, such as Delta G degrees, Delta H degrees, and Delta S degrees, were calculated, indicating that the present system was a spontaneous and endothermic process. A packed column was used to study the continuous chromium biosorption performance of S. polycystum. The biosorbent performance was evaluated at different bed heights (15-25 cm) and flow rates (5-15 mL/min). Favorable conditions for Cr biosorption were observed at the highest bed height (25 cm) and lowest flow rate (5 mL/min); at which the Cr uptake and percent removal were recorded as 29.1 mg/g and 63.3%, respectively. Mathematical modeling of column experimental data was performed, using nonlinear forms of the Thomas and modified-dose-response models; with the latter able to describe the breakthrough curves with high-correlation coefficients. (C) 2010 American Institute of Chemical Engineers Environ Prog, 29: 334-341, 2010
引用
收藏
页码:334 / 341
页数:8
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