Separating of biogas from each other, which produced through manure decomposition by anaerobic digestion.
Scrubbing the biogas with an alkali such as sodium hydroxide or carbonate will remove the carbon dioxide, the main contaminant, and also any other acidic contaminants such as hydrogen sulphide and possibly organic thiols (mercaptans).
The technologies that are used commercially
for biogas upgrading today are :
1. Pressure swing adsorption,
2. High pressure water scrubbing,
3. Organic solvent scrubbing,
4. Amine scrubbing,
5. Membrane separation
6. Cryogenic separation
Following many parameters such scale, final bio-methane use, the local cost, the H2S percentage, you have to choose the methods
Gases are separated based on a difference in properties. Solution: select a process based on that property ( Boiling point, size, freezing point).
Name of some membranes are mentioned below for biogas separation.
http://www.sciencedaily.com/releases/2007/10/071011142625.htm
http://www.eurekalert.org/pub_releases/2007-10/uota-nms101007.php
http://phys.org/news/2012-10-energy-efficient-graphene-membranes-natural-gas.html
http://www.eurekalert.org/pub_releases/2012-03/uoc--nmc032812.php
http://www.colorado.edu/news/releases/2012/10/08/graphene-membranes-may-lead-enhanced-natural-gas-production-less-co2
http://www.eurekalert.org/pub_releases/2014-07/giot-hmc062614.php
Dear Akram Alkrwi . You can use dense membranes for separation biogas from each other
Khalid
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