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Title: Combined heat treatment and acid hydrolysis of cassava grate waste (CGW) biomass for ethanol production

Abstract

The effect of combined heat treatment and acid hydrolysis (various concentrations) on cassava grate waste (CGW) biomass for ethanol production was investigated. At high concentrations of H{sub 2}SO{sub 4} (1--5 M), hydrolysis of the CGW biomass was achieved but with excessive charring or dehydration reaction. At lower acid concentrations, hydrolysis of CGW biomass was also achieved with 0.3--0.5 M H{sub 2}SO{sub 4}, while partial hydrolysis was obtained below 0.3 M H{sub 2}SO{sub 4} (the lowest acid concentration that hydrolyzed CGW biomass) at 120 C and 1 atm pressure for 30 min. A 60% process efficiency was achieved with 0.3 M H{sub 2}SO{sub 4} in hydrolyzing the cellulose and lignin materials present in the CGW biomass. High acid concentration is therefore not required for CGW biomass hydrolysis. The low acid concentration required for CGW biomass hydrolysis, as well as the minimal cost required for detoxification of CGW biomass because of low hydrogen cyanide content of CGW biomass would seem to make this process very economical. From three liters of the CGW biomass hydrolysate obtained from hydrolysis with 0.3M H{sub 2}SO{sub 4}, ethanol yield was 3.5 (v/v%) after yeast fermentation. However, although the process resulted in gainful utilization of CGW biomass, additionalmore » costs would be required to effectively dispose new by-products generated from CGW biomass processing.« less

Authors:
; ; ; ;  [1]; ;  [2]
  1. Enugu State Univ. of Science and Technology (Nigeria). Faculty of Applied Natural Sciences
  2. Nnamdi Azikiwe Univ., Awka (Nigeria). Dept. of Applied Microbiology
Publication Date:
OSTI Identifier:
571636
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 17; Journal Issue: 1; Other Information: PBD: 1997
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; ETHANOL; CASSAVA; WASTE PROCESSING; ORGANIC WASTES; ACID HYDROLYSIS; YIELDS; HEAT TREATMENTS; FERMENTATION

Citation Formats

Agu, R.C., Amadife, A.E., Ude, C.M., Onyia, A., Ogu, E.O., Okafor, M., and Ezejiofor, E. Combined heat treatment and acid hydrolysis of cassava grate waste (CGW) biomass for ethanol production. United States: N. p., 1997. Web. doi:10.1016/S0956-053X(97)00027-5.
Agu, R.C., Amadife, A.E., Ude, C.M., Onyia, A., Ogu, E.O., Okafor, M., & Ezejiofor, E. Combined heat treatment and acid hydrolysis of cassava grate waste (CGW) biomass for ethanol production. United States. doi:10.1016/S0956-053X(97)00027-5.
Agu, R.C., Amadife, A.E., Ude, C.M., Onyia, A., Ogu, E.O., Okafor, M., and Ezejiofor, E. Wed . "Combined heat treatment and acid hydrolysis of cassava grate waste (CGW) biomass for ethanol production". United States. doi:10.1016/S0956-053X(97)00027-5.
@article{osti_571636,
title = {Combined heat treatment and acid hydrolysis of cassava grate waste (CGW) biomass for ethanol production},
author = {Agu, R.C. and Amadife, A.E. and Ude, C.M. and Onyia, A. and Ogu, E.O. and Okafor, M. and Ezejiofor, E.},
abstractNote = {The effect of combined heat treatment and acid hydrolysis (various concentrations) on cassava grate waste (CGW) biomass for ethanol production was investigated. At high concentrations of H{sub 2}SO{sub 4} (1--5 M), hydrolysis of the CGW biomass was achieved but with excessive charring or dehydration reaction. At lower acid concentrations, hydrolysis of CGW biomass was also achieved with 0.3--0.5 M H{sub 2}SO{sub 4}, while partial hydrolysis was obtained below 0.3 M H{sub 2}SO{sub 4} (the lowest acid concentration that hydrolyzed CGW biomass) at 120 C and 1 atm pressure for 30 min. A 60% process efficiency was achieved with 0.3 M H{sub 2}SO{sub 4} in hydrolyzing the cellulose and lignin materials present in the CGW biomass. High acid concentration is therefore not required for CGW biomass hydrolysis. The low acid concentration required for CGW biomass hydrolysis, as well as the minimal cost required for detoxification of CGW biomass because of low hydrogen cyanide content of CGW biomass would seem to make this process very economical. From three liters of the CGW biomass hydrolysate obtained from hydrolysis with 0.3M H{sub 2}SO{sub 4}, ethanol yield was 3.5 (v/v%) after yeast fermentation. However, although the process resulted in gainful utilization of CGW biomass, additional costs would be required to effectively dispose new by-products generated from CGW biomass processing.},
doi = {10.1016/S0956-053X(97)00027-5},
journal = {Waste Management},
number = 1,
volume = 17,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 1997},
month = {Wed Dec 31 00:00:00 EST 1997}
}