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2017 | 14 |
Tytuł artykułu

Chemical composition and diluted acid hydrolysis pretreatment of Acacia mellifera sawdust as a raw material for bioethanol production

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Biofuels are alternatives to fossil fuels for ensuring energy security and for mitigating climate change. Currently, most biofuels are in the form of a bioethanol that is generated from starch or sugar. Increasing energy demand, food insecurity and ecological concerns leads to evaluating agricultural, forestry and urban lignocellulosic wastes as being very important for energy production. This is because all celluloses and hemicelluloses of lignocellulosic wastes can be converted into bioethanol reducing sugars. Hence, the current study was initiated to determine the chemical composition and best diluted acid hydrolysis pretreatment of Acacia mellifera sawdust for bioethanol production. Our study indicates that the chemical composition of Acacia mellifera sawdust exhibits different composition in extractives such as alcohol, cellulose, lignin and ash. Accordingly, the extractive content of the sawdust was 6.3% soluble alcohol toluene, 52.9% cellulose, 23.9% lignin, 4.2% ash, and 6.92% moisture content, respectively. In our experiment, the biomass at a solid loading rate of 0.66% was pretreated at 121 °C with different sulfuric acid concentrations (0.5, 0.75, and 1 %, w/w) and residence times (10, and 20 min). Total reducing sugars in the hydrolyzed sample with acid and time were then analyzed. The reducing sugars obtained at 0.50%, 0.75% and 1% dilute sulfuric acid concentration with time residence of 10 min and 20 min were, 7.39±0.24 and 8.4±0.9, 8.03±0.64 and 9.18±0.43, 9.68±1.30 and 10.23±0.80, respectively. With the increasing acid concentration and residence time, the amount of glucose in the filtrates increased. Therefore, the total reducing sugar concentration in the hydrolysate of Acacia mellifera saw dust was significantly influenced by the sulfuric acid concentration and residence time. From this study, it can be concluded that total reducing sugars in lignocellulosic wastes are widely available and easily obtainable, they can be considered as potential feedstocks for bioethanol production.
Słowa kluczowe
EN
Wydawca
-
Rocznik
Tom
14
Opis fizyczny
p.36-46,fig.,ref.
Twórcy
autor
  • Bioenergy and Biochemical Research Division, Wood Technology Research Center, Ethiopian Environment and Forest Research Institute, P.O. Box 2322, Addis Ababa, Ethiopia
autor
  • Bioenergy and Biochemical Research Division, Wood Technology Research Center, Ethiopian Environment and Forest Research Institute, P.O. Box 2322, Addis Ababa, Ethiopia
Bibliografia
  • [1] Szulczyk, K. R., Which is better transportation fuel-butanol or ethanol. International Journal of Energy and Environment 1(3) (2010) 501-512.
  • [2] Millati, R., C., Niklasson and Taherzadeh, M. J, Effect of pH, time and temperature of over liming on detoxification of dilute-acid hydrolysates for fermentation by Saccharomyces cerevisiae. Process Biochemical 38(4) (2002) 515-522.
  • [3] McMillan, J. D., Bioethanol production: Status and prospects. Renewable Energy 10(2) (1997) 295-302.
  • [4] Khider, T.O. Omer, S.H and Elzaki, O. T, Pulping and Totally Chlorine Free (TCF) Bleaching of Acacia mellifera from Sudan. World Applied Sciences Journal 16 (9) (2012) 1256-1261.
  • [5] Katrin, M. W, Moustakas, A. and Wiegand, K, Big is not better: small Acacia mellifera shrubs are more vital afterfire. African Journal of Ecology 43 (2005) 131-136.
  • [6] M. G. Hagos, G. N. Smit. Soil enrichment by Acacia mellifera subsp. detinens on nutrient poor sandy soil in a semi-arid southern African savanna. Journal of Arid Environments Volume 61, Issue 1, April 2005, Pages 47-59
  • [7] Nikitin, V. M, 'Hirnia drevesini telliuloze', Goslesbumiz dat, M _LPg 233. Chimia Lemnului SI A Celluloze 1 (1960) 1973.
  • [8] David Ward, Karen J. Esler. What are the effects of substrate and grass removal on recruitment of Acacia mellifera seedlings in a semi-arid environment? Plant Ecology February 2011, Volume 212, Issue 2, pp 245–250
  • [9] Albalasmeh A. A., Berhe A. A, Ghezzehei T. A, A new method for rapid determination of carbohydrate and total carbon concentrations using UV spectrophotometry. Carbohydr. Polym. (97) (2013) 253-261.
  • [10] Liu, B. Y., Shi, H. Q., Li, X.Q., and Xu, L.q, Analysis of lignin content in waste liguor of rice straw pulp by ultraviolet spectrometer. China pulp and paper 22(6) (2003) 19-22.
  • [11] Tarig, O. Khider and Osman, T., Journal of forest products & industries 1(2) (2012) 5-9
  • [12] Joubert DF, Rothauge A, Smit GN (2008) A conceptual model of vegetation dynamics in the semiarid Highland savanna of Namibia, with particular reference to bush thickening by Acacia mellifera. J Arid Environ 72: 2201–2210
  • [13] Young TP, Augustine DJ (2007) Interspecific variation in the reproductive response of Acacia species to protection from large mammalian herbivores. Biotropica 39: 559–561
  • [14] Albrecht WA (1957) Soil fertility and biotic geography. Geogr Rev 47: 86–105
  • [15] Cramer MD, Chimphango SBM, Van Cauter A, Waldram MS, Bond WJ (2007) Grass competition induces N2 fixation in some species of African Acacia. J Ecol 95:1123–1133
  • [16] D.F. Joubert, A. Rothauge, G.N. Smit, A conceptual model of vegetation dynamics in the semiarid Highland savanna of Namibia, with particular reference to bush thickening by Acacia mellifera, Journal of Arid Environments, 2008, 72, 12, 2201
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.agro-6e5d4943-452d-4a58-90e5-447d49ee9f0e
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