ABSTRACT
The biogas generated in sewage treatment plants and landfills contains, among other components, siloxanes, organic compounds that limit the use of biogas and biomethane, as a result of their transformation into silicon dioxide during the combustion process. For that reason, the energy use of these biofuels is subject to compliance with the existing siloxanes limits for each application. Thus, adequate monitoring of the concentration of siloxanes is essential to ensure the safe energy use of biogas and biomethane. In this sense, a literature review was carried out with the objective of analyzing the main sampling methodologies of siloxanes in gaseous matrix, raising the main difficulties inherent to its application in the Brazilian context. It was found that although all the methodologies studied have specific limitations, those that use impingers and adsorption tubes are more robust, in addition to being regulated by Brazilian standards. However, as it is a relatively recent issue in Brazil, there are still many technical questions and challenges related to the application of siloxane sampling methodologies at the national level. Therefore, investment in the consolidation of methodologies for quality control of biogas and biomethane should be promoted to encourage the production and use of these biofuels as renewable energy in Brazil.
Keywords:
impinger; adsorption tube; biogas; sampling bags; canister