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Study on detoxification of straw hydrolysate and concentration of sugar by multiple-effect membrane distillation

Authors： LIU Qing1, QIN Yingjie1,2,*, LIU Jianjun1, ZHANG Yun1, LIU Liqiang2, CUI Dongsheng2

Units： 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2. PureSea Spring Membrane Technology Co., Ltd, Tianjin 300300, China

KeyWords： multiple-effect membrane distillation; acidic hydrolysate of straws; volatile organic compounds; glucose; detoxification; concentration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(6):87-92

Abstract：

The aqueous glucose solution obtained from hydrolyzing straws containsformic acid, acetic acid, levulinic acid and furfural which reduce the fermentation efficiency. In this study, multiple-effect membrane distillation (MEMD) process was used to remove these volatile organic species from the simulated hydrolysate and meanwhile enrich the sugar solution. The effects of cold feed-in temperature T1, heated feed-in temperature T3, feed-in concentration Cfand feed-in flow rate Ffwere tested on the performance of MEMD process indicated by permeation flux J, gained-output-ratio (GOR) and rejection rate of glucose Rg. The experimental results showed that J decreased with the increase of T1 while GOR increased; J and GOR both increased with the increase of T3; J and GOR both decreased with the increase of Cf; J increased with the increase of Ff while GOR decreased; Rg was hardly affected by these factors and kept above 99.99% during the whole process. The maximum J and GOR obtained were 6.17 L·m-2·h-1 and 13.57, respectively. The removal rates of formic acid, acetic acid, levulinic acid and furfural were87.76%, 90.62%, 4.25% and 76.52%, respectively, and meanwhile the glucose in the hydrolysate could be concentrated 14 times. This study showed that MEMD process could remove volatile organic species from the hydrolysateand meanwhile enrich the sugar solution effectively.

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