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Title: Bacterial biosorbent for removing and recovering copper from electroplating effluents
Authors: Lo, WH 
Chua, H
Wong, M
Yu, P
Issue Date: 2003
Source: Water science and technology, 2003, v. 47, no. 1, p. 251-256
Abstract: Investigations were carried out to study the removal and recovery of Cu(II) ions from wastewater by Micrococcus sp. The Langmuir isotherm model described very well the equilibrium behavior of copper biosorption, with maximum biosorption capacity (q(max)) reaching 52.1 mg Cu2+/g dry cell at pH 6. Biomass prewashed with sulfuric acid (0.05 mol l(-1)) and sodium sulfate (1 mol l(-1)) solutions were shown to increase the copper removal capabilities up to 27% and 16%, respectively. Copper uptake by cells was negligible at pH 2.0 and then increased quickly with increasing pH until 6.0. Cells of Micrococcus sp. were immobilized in 2% calcium alginate and 10% polyacrylamide gel beads. A counter-current process comprising a series of immobilized cell reactors was developed for removing and recovering copper from electroplating effluents. This process was capable of producing an effluent at low copper concentration, with only a minimum amount of desorbing agent used. The technique of scanning electron microscopy coupled with X-ray dispersion analysis shows that Cu2+ exchanged with K+ and Ca2+ on the cell wall of Micrococcus sp., thereby suggesting ion exchange as one of the dominant mechanisms of metal biosorption for this bacterial strain.
Keywords: Bioremediation
Copper removal
Metal adsorption
Wastewater treatment
Publisher: I W A Publishing
Journal: Water Science and Technology 
ISSN: 0273-1223
Description: 1st IWA Asia Environmental Technology Conference, Singapore, Singapore, 2001
Appears in Collections:Journal/Magazine Article

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