Nov 22, 2005

Use of algae for removing heavy metal ions from wastewater: progress and prospects

Critical Reviews in Biotechnology
S K Mehta, J P Gaur

Abstract

Many algae have immense capability to sorb metals, and there is considerable potential for using them to treat wastewaters. Metal sorption involves binding on the cell surface and to intracellular ligands. The adsorbed metal is several times greater than intracellular metal. Carboxyl group is most important for metal binding. Concentration of metal and biomass in solution, pH, temperature, cations, anions and metabolic stage of the organism affect metal sorption. Algae can effectively remove metals from multi-metal solutions. Dead cells sorb more metal than live cells. Various pretreatments enhance metal sorption capacity of algae. CaCl2 pretreatment is the most suitable and economic method for activation of algal biomass. Algal periphyton has great potential for removing metals from wastewaters. An immobilized or granulated biomass-filled column can be used for several sorption/desorption cycles with unaltered or slightly decreased metal removal. Langmuir and Freundlich models, commonly used for fitting sorption data, cannot precisely describe metal sorption since they ignore the effect of pH, biomass concentration, etc. For commercial application of algal technology for metal removal from wastewaters, emphasis should be given...Continue Reading

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  • Citations118

Citations

Mentioned in this Paper

Metabolic Process, Cellular
Protoplasm
Fermentors
Genetic Manipulation
Metals, Heavy
Industrial Waste
Metal Ion Binding
Landfill Leachate
Cations
Organism

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