Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/28197
Title: Bioleaching of heavy metals from municipal solid waste (MSW) incineration fly ash: kinetics and mechanisms
Authors: XU TONGJIANG
Keywords: Bioleaching, Fly ash, Aspergillus niger, Optimization, Mold morphology, Kinetics, Modeling.
Issue Date: 23-Jan-2008
Source: XU TONGJIANG (2008-01-23). Bioleaching of heavy metals from municipal solid waste (MSW) incineration fly ash: kinetics and mechanisms. ScholarBank@NUS Repository.
Abstract: This study focused on the investigation of bioleaching of heavy metals from fly ash using the fungus Aspergillus niger. The results of optimization showed that of the four factors, the sucrose concentration and pulp density were more important than spore concentration and the time of addition of the fly ash. The study on mold morphology showed that the fungus displayed branched distortion with swollen hyphae during bioleaching. Calcium oxalate was precipitated in bioleaching. The kinetics study showed that the final biomass concentration was 21- 25 g/l in bioleaching. The final gluconic acid was about 140 -250mM. The kinetics studies also showed that Han and Levenspiel model clearly provided good data fitting and prediction; CI*, the fly ash concentration which caused the fungal activity to cease, was found to be 6.0%, and the maximum specific growth rate was 0.115 day-1.
URI: http://scholarbank.nus.edu.sg/handle/10635/28197
Appears in Collections:Ph.D Theses (Open)

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Cover.pdf3.98 kBAdobe PDF

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Title.pdf5.57 kBAdobe PDF

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Table of Content.pdf64.51 kBAdobe PDF

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1 Introduction.pdf33.29 kBAdobe PDF

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2 Literature review.pdf199.83 kBAdobe PDF

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3 Materials and methods.pdf51.07 kBAdobe PDF

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4 Physical and Chemical Charact.pdf104.47 kBAdobe PDF

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5 Optimization.pdf848.41 kBAdobe PDF

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6 Mold morphology.pdf3.96 MBAdobe PDF

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7 Bioleaching Kinetics.pdf159.85 kBAdobe PDF

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8 Bioleaching Models.pdf219.46 kBAdobe PDF

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9 Conclusion.pdf31.03 kBAdobe PDF

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10 References.pdf76.54 kBAdobe PDF

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11 Appendices.pdf66.02 kBAdobe PDF

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12 Publications.pdf13.24 kBAdobe PDF

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