Removal of humic acid fractions by Rhizopus arrhizus: uptake and kinetic studies

Zhou, J.L. and Banks, C.J. (1991) Removal of humic acid fractions by Rhizopus arrhizus: uptake and kinetic studies. Environmental Technology, 12, (10), 859-869. (doi:10.1080/09593339109385080).


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Humic acid components HFO-A and HPI-N were studied for their removal by Rhizopus arrhizus. The removal was stimulated by the presence of sucrose followed by pretreating biomass with formaldehyde or autoclaving. The presence of Cd2+ ions and high ionic strength in solution was found to increase the adsorptive capacity of R. arrhizus for HPO-A and HPI-N. The uptake of HPO-A and HPI-N by R. arrhizus was biphasic in nature and generally a much slower process than heavy metal biosorption. The first phase was rapid and independent of metabolic energy while the second phase was slow and dependent on metabolic energy. The infrared spectra showed no chemical reaction has occurred between cell walls and adsorbates. Physical adsorption is therefore the main mechanism of humic removal by inactive R. arrhizus.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1080/09593339109385080
ISSNs: 0959-3330 (print)
1479-487X (electronic)
Keywords: humic acid, fungi, uptake, kinetics, decomposition
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
Divisions : University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 74929
Accepted Date and Publication Date:
October 1991Published
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:08

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