Rice husk, a milling byproduct of rice, is an agricultural waste which is usually burnt in the open air or stacked on farmland, releasing large amounts of hazardous substances, occupying land resources, and polluting the environment [1]. It has a characteristic of hard surface, high silica content, small bulk density, not easily decomposed by bacteria and has traditionally been disposed in landfill. This can result in a source of pollution, eutrophication and perturbations in the aquatic and terrestrial life [2]. When used to generate electric power, the emission of rice husk ash into the ecosystem is associated with its persistent, carcinogenic and bio-accumulative effects, resulting in silicosis syndrome, fatigue, shortness of breath, loss of appetite and respiratory failure [3].