BIOGAS PURIFICATION USING WATER SCRUBBING SYSTEMS (DOWNLOAD PDF )
Biogas is the result of the anaerobic digestion process, and has a promising use in energy generation
with 40-70% methane present in the gas. Using biogas in energy production is useful not only as a
renewable energy source, but also because it captures and uses green house gases normally emitted
into the atmosphere. Biogas is presently used in heating and in turbines for electricity production.
Anaerobic digestion is the process in which organic materials are degraded by anaerobic bacteria
completing methanogenesis, and creating methane. This process is present in landfills, sewage sludge,
and biomass digesters. The resulting biogas contains 55-70%vol methane (CH4), 30-45% vol carbon
dioxide (CO2), and 0-1.5%vol hydrogen sulphide (H2S); the exact composition depending on the
feedstock and the anaerobic digestion conditions.
Biogas has limited use in energy generation due to the presence of H2S. The H2S present converts to
sulphuric acid when combusted, and creates corrosion in the combustion chamber, especially with
levels in excess of 100ppm H2S in the biogas. By removing the H2S present, the use of biogas can
expand from heating and generators, to applications such as diesel engines.
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| BIOGAS PURIFICATION USING WATER SCRUBBING SYSTEMS Diagram |
Introduction
Biogas is the result of the anaerobic digestion process, and has a promising use in energy generation
with 40-70% methane present in the gas. Using biogas in energy production is useful not only as a
renewable energy source, but also because it captures and uses green house gases normally emitted
into the atmosphere. Biogas is presently used in heating and in turbines for electricity production.
Anaerobic digestion is the process in which organic materials are degraded by anaerobic bacteria
completing methanogenesis, and creating methane. This process is present in landfills, sewage sludge,
and biomass digesters. The resulting biogas contains 55-70%vol methane (CH4), 30-45% vol carbon
dioxide (CO2), and 0-1.5%vol hydrogen sulphide (H2S); the exact composition depending on the
feedstock and the anaerobic digestion conditions.
Biogas has limited use in energy generation due to the presence of H2S. The H2S present converts to
sulphuric acid when combusted, and creates corrosion in the combustion chamber, especially with
levels in excess of 100ppm H2S in the biogas. By removing the H2S present, the use of biogas can
expand from heating and generators, to applications such as diesel engines.
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