Removal of copper(II) by manganese-coated sand in a liquid fluidized-bed reactor

被引：42

作者：

Lee, CI

Yang, WF

Hsieh, CI

机构：

[1] Grad. Inst. of Environ. Engineering, National Taiwan University, Taipei 10673, Taiwan

[2] Dept. of Bioenvironmental Syst. Eng., National Taiwan University, Taipei 10673, Taiwan

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2004年 / 114卷 / 1-3期

关键词：

Adsorption; Copper removal; Coprecipitation; Fluidized-bed reactor; Manganese-coated sand;

D O I：

10.1016/j.jhazmat.2004.06.033

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study was performed in a fluidized-bed reactor (FBR) filled with manganese-coated sand (MCS) to treat copper-contaminated wastewater. The adsorption characteristics of MCS, the adsorption equilibrium of MCS, and the copper removal capacity by MCS in FBR were investigated. In terms of the adsorption characteristics of MCS, the surface of MCS was evaluated using a scanning electron microscope (SEM). Energy dispersive analysis (EDS) of X-rays indicated the composition of MCS, and the quantity of manganese on MCS was determined by means of acid digestion analysis. The experimental results indicated that copper was removed by both sorption (ion exchange and adsorption) and coprecipitation on the surface of MCS in FBR. Copper removal efficiency was highly dependent on the pH and increased with increasing pH from pH 2 to 8. After the copper adsorption by MCS, the pH in solution was decreased. When the MCS concentration was greater than 10 g/l, the copper adsorptivities obtained by FBR were almost the same as that from the shaker and when the MCS concentration reached 40 g/l, the copper adsorptivity in FBR was greater than that from the shaker. The adsorption sites of MCS could be used efficiently by the FBR. A Langmuir adsorption isotherm equation fit the measured adsorption data from the batch equilibrium adsorption test better than the Freundlich adsorption isotherm equation did. In addition, the adsorption rate increased when the influent wastewater was aerated. © 2004 Elsevier B.V. All rights reserved.

引用

页码：45 / 52

页数：8

共 16 条

[1]

Gardea-Torresdey J.L., Tang L., Salvador J.M., Copper adsorption by esterified and unesterified fractions of Sphagnum peat moss and its different humic substances, J. Hazard. Mater., 48, pp. 191-206, (1996)

[2]

Bailey S.E., Olin T.J., Bricka R.M., Adrian D.D., A review of potentially low-cost sorbents for heavy metals, Water Res., 33, pp. 2469-2479, (1999)

[3]

Rao Gadde R., Herbert A., Laitinen, Studies of heavy metal adsorption by hydrous iron and manganese oxides, Anal. Chem., 46, 13, pp. 2022-2026, (1974)

[4]

Bailey R.P., Bennett T., Benjamin M.M., Sorption onto and recovery of Cr(VI) using iron-oxide-coated sand, Water Sci. Technol., 26, 56, pp. 1239-1244, (1992)

[5]

Lo S.L., Jeng H.T., Lai C.H., Characteristics and adsorption properties of iron-coated sand, Water Sci. Technol., 35, 7, pp. 63-70, (1997)

[6]

Lai C.H., Chen C.Y., Wei B.L., Yeh S.H., Cadmium adsorption on the goethite-coated sand in the presence of humic acid, Water Res., 36, pp. 4943-4950, (2002)

[7]

Hor'anyi G., Jo'o P., Comparative radiotracer study of the adsorption of sulfate and pertechnetate ions on γ-Al 2O 3 , J. Colloid Interf. Sci., 243, pp. 46-51, (2001)

[8]

Tao Z., Li W., Fuming Z., Youqian D., Yu Z., Am(III) adsorption on oxides of aluminium and silicon: Effects of humic substances, pH, and ionic strength, J. Colloid Interf. Sci., 265, pp. 221-226, (2003)

[9]

Kanungo S.B., Paroda K.M., Interfacial behavior of some synthetic MnO2 samples during their adsorption of Cu 2+ and Ba 2+ from aqueous solution at 300 K, J. Colloid Interf. Sci., 98, pp. 252-260, (1984)

[10]

Harms W.D., Robinson R.B., Softening by fluidized-bed crystallizers, J. Environ. Eng., ASCE, 118, pp. 513-529, (1992)

← 1 2 →