• Bruno Sialve a. . ,
• Nicolas Bernet a ,
• Olivier Bernard b

• a INRA, UR050, Laboratoire de Biotechnologie de l’Environnement, Avenue des Etangs, Narbonne F-11100, France
• b INRIA-COMORE, 2004 Avenue des lucioles, BP93, Sophia-Antipolis F-06902, France

Received 28 October 2008, Revised 28 February 2009, Accepted 8 March 2009, Available online 14 March 2009

Abstract

The potential of microalgae as a source of biofuels and as a technological solution for CO2 fixation is subject to intense academic and industrial research. In the perspective of setting up massive cultures, the management of large quantities of residual biomass and the high amounts of fertilizers must be considered. Anaerobic digestion is a key process that can solve this waste issue as well as the economical and energetic balance of such a promising technology. Indeed, the conversion of algal biomass after lipid extraction into methane is a process that can recover more energy than the energy from the cell lipids. Three main bottlenecks are identified to digest microalgae. First, the biodegradability of microalgae can be low depending on both the biochemical composition and the nature of the cell wall. Then, the high cellular protein content results in ammonia release which can lead to potential toxicity. Finally, the presence of sodium for marine species can also affect the digester performance. Physico-chemical pretreatment, co-digestion, or control of gross composition are strategies that can significantly and efficiently increase the conversion yield of the algal organic matter into methane. When the cell lipid content does not exceed 40%, anaerobic digestion of the whole biomass appears to be the optimal strategy on an energy balance basis, for the energetic recovery of cell biomass.

Lastly, the ability of these CO2 consuming microalgae to purify biogas and concentrate methane is discussed.

Keywords

• Anaerobic digestion ;
• Microalgae ;
• Biochemical methane potential ;
• Codigestion ;
• Pretreatment ;
• Biogas ;
• CO2 mitigation ;
• Biofuel

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Corresponding author. Present address: Naskeo Environnement, Avenue des Etangs, Narbonne F-11100, France. Tel. +33 468425191; fax: +33 468425160.

2009 Elsevier Inc. All rights reserved.

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