Biogas produced from organic waste seems to me like a perfect bridge fuel to power the transition towards a fossil fuel powered world. The main obisticle for are the high levels of impurities per volume of biogas. Could a gaseous centrifuge solve this issues at an economical cost or do you think some other method would be more cost effective?
The techniques for CO2removalare listed below:
-Physical and chemical CO2-absorption;
-Pressure Swing Adsorption (PSA) and Vacuum Swing Adsorption (VSA);
-Membrane separation;
-Cryogenic separation;
-Biological methane enrichment.
http://csanr.wsu.edu/publications/researchreports/CFF%20Report/CSANR2010-001.Ch09.pdf
http://www.ipt.ntnu.no/~jsg/undervisning/naturgass/oppgaver/Oppgaver2012/12Galante.pdf
By using an biocatalyst the efficiency of the upgrading process can be increased and the cost of energy reduced. Akermin’s approach enables the use of non-volatile, carbonate-forming solvents, which, without an enzyme, absorb Carbon Dioxide at a rate that is far too slow to have any practical application, but that otherwise have outstanding physical properties. By addressing this key limitation, Akermin creates an environmentally friendly solution for removing Carbon Dioxide from biogas.
http://biocat-project.com/news/biogas-more-cost-effective-upgrading-using-biocatalyst/
A promising Swedish invention is Biosling where the gas is led to a long hose that is winded up causing an increase in pressure making the CO2 to be dissolved. Have a look at Biosling.se.
No. the most efficient ones are used in uranium enrichment, a very expressive, and technologically secret process.
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