Membrane Decolorization And Desalination Of Corncob Hydrolysate And Asparagus Aqueous Extraction

Under the fast development technology and booming population, environmental protection and energy saving have already become the first issue. The xylose contained in the corncob hydrolysates can be further fermented to xylitol, while asparagus aqueous extraction can be applied in other useful ways. However, the existed coloring matters and salts can impair the separation efficiency and increase active ingredient loss. Activated charcoal was widely used in decolorization. While active compounds was absorbed into activated charcoal inherently, resulted in large xylose loss. Ion exchange resin was applied in desalination, but the chemical solvent used during resin preparation and regeneration would contaminate the environment, leading to pollution issues.In order to solve the problems of active compounds loss, environmental pollution and longer running time, integrated membrane separation technology was introduced into these systems. Membrane properties, operation parameters, filtration modes and solute concentration were studied and compared systematically. On the base of membrane fouling resistance theory, different membrane cleaning methods were discussed to address the membrane fouling issue.According to the optimization of decolorization and desalination parameters, the ultimate decolorization rate was74.64%-95.14%and desalination rate was92.81%. Under these circumstances, membrane fouling phenomena as well as flux decline can be eliminated. While sugar loss can be reduce from5%to3%. The most efficient membrane cleaning method was determined, making water flux recovery increased from23.41%to94.83%.