Publication: Equilibrium and kinetic studies on the adsorption of humic acid by activated sludge and Bacillus subtilis
Issued Date
2012-12-17
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ISSN
01253395
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2-s2.0-84870873409
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Mahidol University
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SCOPUS
Bibliographic Citation
Songklanakarin Journal of Science and Technology. Vol.34, No.6 (2012), 669-677
Suggested Citation
Woranart Jonglertjunya, Tidathip Lertchutimakul Equilibrium and kinetic studies on the adsorption of humic acid by activated sludge and Bacillus subtilis. Songklanakarin Journal of Science and Technology. Vol.34, No.6 (2012), 669-677. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/15234
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Title
Equilibrium and kinetic studies on the adsorption of humic acid by activated sludge and Bacillus subtilis
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Abstract
This research is concerned with the adsorption of humic acid by activated sludge obtained from an alcoholic beverage plant and Bacillus subtilis (ATCC 6633). The effects of experimental factors such as initial pH, agitation speed, and types of adsorbent have been studied to compare adsorption capacity. The characterisation of activated sludge and Bacillus subtilis adsorption were examined by investigating the adsorption isotherm and kinetics. The results showed that the type of adsorbent had a significant relationship with adsorption capacity. In case of Bacillus subtilis, a maximum value of adsorption capacity of 11.44 mg humic acid /g biomass was observed based on the Langmuir adsorption isotherm and K value of 3.17× 10 -2 ((mg/g)(mg/l) n ) from the Freundlich adsorption isotherm. The kinetic studies indicated that a pseudo second-order equation fitted the data remarkably well resulting in a rate constant (k 2 ) of about 0.019 g·mg-1min-1 for the adsorption onto Bacillus subtilis.