African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12024

Full Length Research Paper

Generation of bioethanol from common date by-products, “Teggaza and Lebghel” in Southern Algeria

Ahmed Boulal
  • Ahmed Boulal
  • Unité de Recherche en Energie Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER, 01000, Adrar, Algeria.
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Mabrouk Kihal
  • Mabrouk Kihal
  • Laboratoire de microbiologie appliquée, département de biologie, faculté sciences de la nature et de la vie, Université Oran1 Ahmed Ben Bella, 31100, Oran, Algeria.
  • Google Scholar
Cherif Khelifi*
  • Cherif Khelifi*
  • Unité de Recherche en Energie Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER, 01000, Adrar, Algeria.
  • Google Scholar
Boudjemaa Benali
  • Boudjemaa Benali
  • Unité de Recherche en Energie Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER, 01000, Adrar, Algeria.
  • Google Scholar


  •  Received: 29 March 2016
  •  Accepted: 09 December 2016
  •  Published: 04 January 2017

Abstract

Date by-products constitute the principal food for the oasis populations in Middle East and North Africa. Dates contents consist of 70 to 80% of reducing sugars, and do not require an intensive energy and labour for thermophysical pre-treatment. They can serve as a good feedstock for bioethanol generation through fermentation and distillation. Algeria is among the top sixth producers of dates in the world with more than 250,000 tons/year; from these, more than 30% can be lost for different reasons and may be of low quality. In the laboratory, after an alcoholic fermentation of the  substrate of the date varieties, Teggaza and Lebghel (T & L) using bakery yeast at 30°C for 72 h, the distilled and rectified date juice generated the highest ethanol ( 88° and 90°) with acceptable productions of 2.5 and 2.78 mL/kg/h, and assessed scale efficiencies of 23.57 and 26.2%. This is unlike the one (ethanol; 50%) directly generated by chemical reaction using the same quantity of sugar. The efficiencies that were obtained seem satisfactory and encourage the great scaling development of bioethanol generation using date waste biomass abundant in Algerian Sahara.

Key words: Algerian Sahara, alcoholic fermentation, bioethanol, bakery yeast, dates by-product, distillation