Overview
ABSTRACT
This article is devoted to the purification of biogas and in particular to the removal of volatile organic compounds (VOCs) and siloxanes. After a presentation of the constituent elements of biogas after anaerobic digestion of domestic, industrial, agricultural organic matters or sewage sludge, the contents of undesirable compounds are presented. The separation/purification processes to be implemented depends on the recovery of the biomethane: engine, electricity, fuel cell or network injection. The treatment processes (condensation, membrane, absorption, adsorption, oxidation, biodegradation) of biogas are described and discussed.
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Read the articleAUTHORS
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Benoît BOULINGUIEZ : Doctor, Engineer from the National Higher School of Chemistry of Rennes (ENSCR) - Managing Director of Kanadevia Inova BioMethan GmbH, Kanadevia Inova ETOGAS GmbH, and Kanadevia Inova RGA GmbH - Director of Renewable Gas Products, Kanadevia Inova, Barberey-Saint-Sulpice, France
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Pierre LE CLOIREC : Professor Emeritus, Honorary Director of ENSCR - National Higher School of Chemistry of Rennes (ENSCR), Rennes, France
INTRODUCTION
At a time when conditions are particularly favorable for the development of alternative energies to fossil fuels, the prospect of integrating biogas into the French energy landscape is of definite interest from a political, economic, and environmental standpoint. Indeed, the recovery of domestic, industrial, and agricultural organic waste and the treatment of wastewater are in line with the concepts of sustainable development and renewable energy applications, as clearly set out in recent international commitments and agreements. The environmental impact of implementing biogas recovery systems results in a significant reduction in greenhouse gas emissions. As methane has a greenhouse effect 20 to 30 times greater than that of carbon dioxide, it is preferable to recover energy from methane through combustion rather than releasing it into the atmosphere
Nevertheless, the optimal integration of this resource into existing energy networks is not without technical challenges. Gas dehumidification and hydrogen sulfide reduction are two key steps in the biogas treatment process. However, research on this topic in recent years has highlighted the pressure exerted by volatile organic compounds (VOCs) present in biogas on the operation of energy production facilities. Regardless of the recovery process used, the presence of these compounds at concentrations in the ppm (mg/m 3 ) range poses a risk of premature deterioration of the...
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KEYWORDS
VOC | biogas | siloxanes | volatile organic compounds | treatment processes
EDITIONS
Other editions of this article are available:
- Archived version Oct 2011 1 by Benoît BOULINGUIEZ, Pierre LE CLOIREC
CAN BE ALSO FOUND IN:
Biogas Purification - Eliminating VOCs and Siloxanes
Biogas – background information
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