COMPARATIVE STUDY ON THE PRETREATMENT OF CASSAVA DREGS TO FERMENTABLE SUGARS BY SUBSEQUENT ENZYMATIC HYDROLYSIS
Cassava has been being widely used to produce ethanol in China. During the cassava-to-ethanol process, 15％ cassava dregs (based on weight of feedstock) are produced, which contains 50.17％ holocellulose, 19.19％ acid-insoluble lignin, 11.85％ ash and 16.71％ hot water extractives based on our composition analysis. This paper investigated the total sugar yield from cassava dregs which suffered various pretreatments followed by enzymatic hydrolysis. Enzymatic hydrolysis results showed that 200 ℃ hot-water treatment for 1 h gave reducing sugars yield of 0.2396 g/g; 3％ and 8％ alkali pretreatment at 120 ℃ for 1 h, gave the yield of 0.2303 g/g and 0.2307 g/g, respectively; 0.5％ and 2％ diluted acid pretreatment for at 120 ℃ for 1 h, gave the yield of 0.2410 g/g and 0.4062 g/g, respectively; untreated dregs only gave 0.1359 g/g reducing sugar yield. It can be seen that pretreatment with 2％ H2SO4 could attain the highest sugar yield of 75.38％ at such a mild pretreatment temperature. Effect of pretreatments on surface structure of substrate was investigated by SEM and BET. SEM results showed that a lot of micropores formed which was supposed to be caused by removal of hemicellulose and lignin, which was consistent with BET results which showed that specific surface area of treated substrate increased compared to that of untreated feedstock.
cassava dregs pretreatment enzyme hydrolysis fermentable sugars
Haisong Wang Chao Liu Xindong Mu
Qingdao Institute of Bioenergy and Bioprocess Technology,CAS Key Laboratory of Biqfuels, CAS, Qingdao 266101,China
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1037-1040
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）