THESIS
2015
xii, 110 pages : illustrations (some color) ; 30 cm
Abstract
In this thesis, different ways of delignifying rice husks were tested and a comparison on the basis
of the oil sorption capacity using chemical and biological pretreatment of rice husks. Three
chemical pretreatment methods and the four micro-organism pretreatment methods were
investigated to test the effect of lignin and hemicellulose degradation. In chemical pretreatment,
sodium hydroxide pretreatment with a supplement of hydrogen peroxide proved to be the most
productive way in generating the highest faction of α-cellulose. Sodium hydroxide pretreatment
has been shown to be effective on both lignin and hemicellulose degradation. Hydrogen peroxide
pretreatment was found to be a less effective for lignin and hemicellulose degradation, compared
with the other two methods. Althoug...[
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In this thesis, different ways of delignifying rice husks were tested and a comparison on the basis
of the oil sorption capacity using chemical and biological pretreatment of rice husks. Three
chemical pretreatment methods and the four micro-organism pretreatment methods were
investigated to test the effect of lignin and hemicellulose degradation. In chemical pretreatment,
sodium hydroxide pretreatment with a supplement of hydrogen peroxide proved to be the most
productive way in generating the highest faction of α-cellulose. Sodium hydroxide pretreatment
has been shown to be effective on both lignin and hemicellulose degradation. Hydrogen peroxide
pretreatment was found to be a less effective for lignin and hemicellulose degradation, compared
with the other two methods. Although with the aid of hydrogen peroxide, the delignification of
sodium hydroxide is increased largely. In microbial treatment tests, three strains of fungus have a better performance than that of the bacterium strain. Aspergillus flavus is the most effective one
in cellulose production. However, bacterium strain, Bacillus licheniformis degrades most
hemicellulose among all the strains. For the oil sorption tests, sodium hydroxide (NaOH) /
hydrogen (H
2O
2) peroxide pretreatment rice husks and Aspergillus flavus pretreatment rice husks were compared for their oil sorption capacity. With the large amount of cellulose present, the oil uptake capacity of NaOH/ H
2O
2 pretreatment has the largest capacity. Meanwhile, uptake
kinetics modeling and retention modeling were also used to find the most suitable model for
modified rice husks oil sorption capacity test.
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