AI SearchBiopulping and biobleaching of Eucalyptus camaldulensis and Acacia mangium
Call Number: AIT Thesis no.PP-04-14 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. PP-04-14Publication details: Pathum Thani, Thailand : Asian Institute of Technology, 2004Description: 70 leaves : illSubject(s): Online resources: Dissertation note: Thesis (M.Sc.) - Asian Institute of Technology, 2004 Summary: Three white rot fungi (Ceriporiopsis subvermispora, Phanerochate chrysosporium and Trametes (Coriolus) versicolor) were tested for their ability to modify/degrade lignin in cooking and bleaching. Both chips and pulps of Acacia mangium and Eucalyptus camaldulensis were pretreated with these white-rot fungi for different time period (8, 12 and 16 days for cooking; and 4, 8 and 12 days for bleaching). In chips pretreatment, kappa number was decreased with the increase of fungal treatment time and was maximum of 28% and 25% kappa reduction for acacia and eucalyptus respectively after 16 days of fungi inoculation than the control pulp. The brightness of screened pulp was increased up to 8 ISO units for this time period. At the same time viscosity was also increased up to 86 and 29 units for acacia and eucalyptus respectively with 2 to 4 units of kappa reduction than without fungi treated chips for the 8 days of inoculation. But it was decreased for the prolonged inoculation time though the difference was not significant with the untreated pulps. In bleaching, the final brightness was higher in case of FDOED, bleached pulps than OD0ED, bleached pulps for both the species and it was up to 8 ISO units. It was also possible to achieve the final brightness of pulp by FDoED, bleaching sequence. Handsheet properties were also significantly changed by fungi treatment prior to bleaching. Strength properties of handsheet were increased up to 20% by fungi treatment than the reference handsheet. Specific formation of handsheet was better when the pulp was treated with the fungi. Air permeability and roughness decreased significantly with the increase inoculation time of fungi. Considering all the pulping and papermaking properties, the performance of C. subvermispora was better than other fungi and the response of eucalyptus to fungi was better than acacia.
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Asian Institute of Technology Library Archives | AIT Thesis no.PP-04-14 (Browse shelf(Opens below)) | Available | 30050160025499 |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
Thesis (M.Sc.) - Asian Institute of Technology, 2004
Three white rot fungi (Ceriporiopsis subvermispora, Phanerochate chrysosporium and Trametes (Coriolus) versicolor) were tested for their ability to modify/degrade lignin in cooking and bleaching. Both chips and pulps of Acacia mangium and Eucalyptus camaldulensis were pretreated with these white-rot fungi for different time period (8, 12 and 16 days for cooking; and 4, 8 and 12 days for bleaching). In chips pretreatment, kappa number was decreased with the increase of fungal treatment time and was maximum of 28% and 25% kappa reduction for acacia and eucalyptus respectively after 16 days of fungi inoculation than the control pulp. The brightness of screened pulp was increased up to 8 ISO units for this time period. At the same time viscosity was also increased up to 86 and 29 units for acacia and eucalyptus respectively with 2 to 4 units of kappa reduction than without fungi treated chips for the 8 days of inoculation. But it was decreased for the prolonged inoculation time though the difference was not significant with the untreated pulps. In bleaching, the final brightness was higher in case of FDOED, bleached pulps than OD0ED, bleached pulps for both the species and it was up to 8 ISO units. It was also possible to achieve the final brightness of pulp by FDoED, bleaching sequence. Handsheet properties were also significantly changed by fungi treatment prior to bleaching. Strength properties of handsheet were increased up to 20% by fungi treatment than the reference handsheet. Specific formation of handsheet was better when the pulp was treated with the fungi. Air permeability and roughness decreased significantly with the increase inoculation time of fungi. Considering all the pulping and papermaking properties, the performance of C. subvermispora was better than other fungi and the response of eucalyptus to fungi was better than acacia.
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