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EU Research Project looks at feeding biogas into the main natural 
gas grid
April 8, 2007

"A key technology for injection of biogas into the natural gas 
grid is upgrading of the biogas to natural gas quality after which 
it can be compressed to transport grid pressure. Biogas consists 
of around 50 to 65% of methane, small fractions of other compounds 
and 50 to 35% of carbon dioxide, which has to be removed before 
injection."

Some of the current technologies discussed in this article include 
membrane separation technology, pressure swing adsorption, and 
cryogenic separation.

http://biopact.com/2007/04/eu-research-project-looks-at-feeding.html
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LEVY,CHERONA L