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Renewable natural gas (RNG), also known as biomethane, is a renewable fuel and biogas which has been upgraded to a quality similar to fossil natural gas and has a methane concentration of 90% or greater. [1]
The purpose of industrial biogas production is the collection of biomethane, usually for fuel. Industrial biogas is produced either; As landfill gas (LFG), which is produced by the decomposition of biodegradable waste inside a landfill due to chemical reactions and microbes, or; As digested gas, produced inside an anaerobic digester.
The most common utilized reactor type for biological methanation is the stirred-tank reactor in which the mass transfer is influenced by several factors such as geometry of the reactor, impeller configuration, the agitation speed and the gas flow rate.
The above table shows the composition of raw biogas after primary treatment and biomethane. The fractions of crude biogas can vary greatly, depending on substrate, plant design, and other factors. The nature of the biomethane is adapted to the corresponding qualities of natural gas. Biogas is used mostly directly in a biogas cogeneration plant.
During a three-hour presentation at a Tokyo hall Tuesday, the car manufacturer giant announced it would offer lean compact engines that also run on so-called green fuels like hydrogen and ...
In this way, the production of renewable gas can be phased in at the same rate as the production capacity is increased. The gas market and infrastructure the natural gas has contributed with is a condition for large scale introduction of renewable biomethane produced through anaerobic digestion or gasification and methanation bio-SNG.
Acidogenic digestate produced from mixed municipal waste. Digestate is the material remaining after the anaerobic digestion (decomposition under low oxygen conditions) of a biodegradable feedstock.
The raw biogas has to be previously upgraded to biomethane. This upgrading implies the removal of contaminants such as hydrogen sulphide or siloxanes, as well as the carbon dioxide. Several technologies are available for this purpose, the most widely implemented being pressure swing adsorption (PSA) , water or amine scrubbing (absorption ...