Performance of Dead Azolla filiculoides Biomass in Biosorption of Au from Wastewater

Authors: Umali, L.; Duncan, J.; Burgess, J.

Source: Biotechnology Letters, Volume 28, Number 1, January 2006 , pp. 45-50(6)

Publisher: Springer

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Abstract:

Dried milled biomass of Azolla filiculoides removed up to 98.2% of gold from wastewater from a gold plating factory containing 5 mg gold/l in solution in batch biosorption. The gold uptake capacity of the biomass was 98 mg/g. Whole dried biomass used in a continuous flow column removed up to 100% of gold from diluted wastewater. A similar column was linked to a sulphide precipitation process to provide a two-step system which was able to remove 98% of gold from undiluted wastewater containing 41 mg Au/l. The lifetime of the column was five days.

Keywords: Au; Azolla filiculoides; biosorption; gold; wastewater

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10529-005-9686-7

Affiliations: 1: Email: j.burgess@ru.ac.za

Publication date: 2006-01-01