Processing Methods of Alkaline Hydrolysate from Rice Husk
Received date: 2016-08-20
Accepted date: 2017-04-21
Online published: 2017-04-28
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.
Key words： rice; husk; alkaline hydrolysate; silica; lignin; polysaccharide
D. Arefieva Olga, A. Zemnukhova Liudmila, A. Kovshun Anastasia, V. Kovekhova Anna . Processing Methods of Alkaline Hydrolysate from Rice Husk[J]. Rice Science, 2017 , 24(4) : 235 -240 . DOI: 10.1016/j.rsci.2017.04.003
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