Processing Methods of Alkaline Hydrolysate from Rice Husk

摘要

This paper devoted to finding processing methods of alkaline hydrolysate produced from rice husk pre-extraction,and discusses alkaline hydrolysate processing schemed and disengagement of some products:amorphous silica of various quality,alkaline lignin,and water and alkaline extraction polysaccharides.Silica samples were characterized:crude (air-dried),burnt (no preliminary water treatment),washed in distilled water,and washed in distilled water and burnt.Waste water parameters upon the extraction of solids from alkaline hydrolysate dropped a few dozens or thousand times depending on the applied processing method.Color decreased a few thousand times,turbidity was virtually eliminated,chemical oxygen demanded about 20-136 times;polyphenols content might decrease 50％ or be virtually eliminated.The most prospective scheme obtained the two following solid products from rice husk alkaline hydrolysate:amorphous silica and alkaline extraction polysaccharide.Chemical oxygen demand of the remaining waste water decreased about 140 times compared to the silica-free solution.