不同预处理方法对木薯渣水解效果的影响

The Influence of Pretreatment Methods on Hydrolysis Effect of Cassava Starch Dregs

目前木薯渣制沼气过程中面临预处理成本高,且预处理的催化剂大都会影响后续的厌氧发酵等难题。采用高温水热、稀HNO3高温催化2种处理方法分别对木薯渣进行水解,将木薯渣固相中的有机质转移到液相中,实现生物质的可溶化。结果表明,高温有利于木薯渣的水解,但同时造成水解液可生化性降低;稀HNO3的加入不仅对木薯渣水解起到催化促进作用,而且提高了水解液的可生化性,与水热水解相比,其BOD5/CODCr在150℃水解5min时从0.48升高到0.64。

In the conversion of cassava starch dregs to biogas, there process, such as higher cost and the inhibition of the catalyst used for are some diflqcult problems in pretreatment subsequent anaerobic digestion. Two different treatment methods for hydrolysis of cassava starch dregs, with hot water respectively used to transfer organic matters into the liquid phase from dissolving of the biomass. The results showed that higher temperature dregs, but it led to the decrease of biodegradability of hydrolysate due or dilute HNO3 at high temperature, were the solid phase, in order to achieve the benefited the hydrolysis of cassava starch to the monosaccharide degradation. Using dilute nitric acid could catalyze the hydrolysis process and also improve the biodegradability of hydrolysate, and the value of BOD5/CODcr of hydrolysate could rise from 0.48 up to 0.64 at 150℃ in 5 min compared with the condition of hot water.