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Abstract_Jin Hyung Lee

Rice husk, a residue from the rice milling process, is one of the most produced biomass materials in the world. Rice husk consists of mainly cellulose, hemicelluose and lignin like other lignocellulosic biomass. However, one of unique properties of rice husk is its high ash content, about 13~20 wt%. It can be a renewble resource for the production of value-added silica as well as bio-based organic materials. This study will present the fractionation of rice husk and synthesize value added materials using each component. A continuous silica extraction process was developed using attrition ball milling and alkaline hydrothermal methods. The silicate obtained from rice husk was used to synthesize engineered silica particles using an environmentally friendly method. The residual carbohydrates were used to produce methane by the anaerobic digestion process. The residual carbohydrates showed 1.8 times higher biogas production than that of the untreated rice husk. The residual carbohydrates were used to synthesize cellulose based materials as well, such as cellulose nanofiber and nanocellulose. The fractionation technique used in this study can extract high value-added silica material from rice husk as well as provide a resource of cellulose based material, eventually contributing to the improvement of the economy of the rice husk-based bioenergy industry.

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