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 LFG TagsAnaerobic Digestion
GHGenius 2.1
GHGenius 3.15
 Biomethane Report
 Prepared March 2009
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There is increased interest in bio-methane in the transportation sector. This term means different things to different people but would typically include landfill gas and the output from anaerobic digestion. The production of landfill gas is already included in GHGenius as a feedstock for methanol production but for this work its use is expanded to compress the gas and use it as CNG or liquefy it to produce LNG.

Anaerobic digestion of biological waste and agricultural residues is a rapidly expanding industry in Europe. Part of the drive there is a result of significant government incentives but there will be situations in Canada where environmental requirements drive the application of this technology and we will likely see some further expansion of the availability of bio-methane in Canada.

Anaerobic digestion (AD) is applied using mostly waste materials (manure, food and beverage wastes, etc.) rather then AD involving feedstocks grown specifically to produce biogas. It is unlikely that this later option will be adopted in North America unless the value of the biogas approaches that in the very heavily subsidized European markets. Hay, as a substitute for silage, as a feedstock for the AD process is modelled so that some sensitivity to non-waste products can be accessed. The structure of the model has been set so that any of the four agricultural residues can be used as a feedstock, either alone or in combination with manure.

The gas from the landfill or the digester will be cleaned up and either compressed or liquefied so that it can be used as a transportation fuel for light and heavy-duty applications.
The necessary changes have been made to the macros to ensure that the sensitivity solvers, Monte Carlo simulator, and other macros all function with the additional sheet in the model. The version of the model that accompanies this report is 3.15.

Tags: Anaerobic Digestion - Biomethane - GHGenius 3.15 - LFG
 Landfill Gas to Methanol
 Prepared for Natural Resources Canada in January 2003
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An interesting pathway to produce transportation fuel is to process landfill gas to methanol. Landfill gas typically contains 50-60% methane, which is a powerful greenhouse gas. The methane can be captured and then flared or used in an energy recovery process. There are a number of landfills, including some in Canada, which use the captured gas to produce steam and electricity. An alternative process is to convert the methane into a transportation fuel such as methanol. The methanol can be used in spark-ignited engines (M85), in modified compression ignited engines (M100), reformed onboard for use in fuel cell vehicles, or reformed to produce hydrogen for use in fuel ell vehicles.
This fuel cycle that uses landfill gas to produce methanol has been successfully added to GHGenius. The model has also expanded the use of hydrogen from electrolysis by adding a heavy-duty fuel cell pathway. Each of the new pathways has full functionality in the model including the summary sheets and the cost effectiveness calculations.

Tags: Electrolysis - GHGenius 2.1 - Hydrogen - LFG - Methanol
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