Bioconversion of water hyacinth (Eichhornia crassipes) to bioethanol
2010
Kuldiloke, J. | Eshtiaghi, M.N. | Peeploy, P. | Amornrattanapong, P., Mahidol Univ., 25/25 Puthamonthon Sai 4, Salaya, Nakhorn Pathom 73170 (Thailand). Dept. of Chemical Engineering
The effect of chemical pretreatment methods such as acid and alkali treatment on conversion of lignocellulose (cellulose, hemicellulose) in water hyacinth was investigated. The highest sugar content in acid pretreated could be observed in water hyacinth treated with 3% H2SO4 solution (up to 18.16% w/w). Subsequent treatment of acid or alkali pretreated sample with 0.8 w/w enzyme (mixture of cellulase and hemicellulase) resulted dynamic increase of sugar in sample (up to 32% w/w). In addition, increasing the applied enzyme concentration from 0.8% w/w to 4% further increased the sugar content in sample (up to 55.5% w/w). Combination of acid treatment and ultrasonic vibration improved the digestion of lignocellulose substances in water hyacinth up to 61.99% w/w. Subcritical water (200 deg C for 10 min) as a physical method and subsequent enzyme treatment (0.8% w/w) resulted up to 17% w/w sugar in sample. Bioethanol concentration during fermentation (at 30 deg C) of pretreated sample using Saccharomyces cereviseae increased with increasing the fermentation time. After 3 days fermentation up to 60% of sugar in sample was converted in ethanol
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