This looks fairly simple to make, of course everything has challenges, I think this is doable. Here is the text that goes with the image:
Another link about making methaneOrganic waste is introduced through the screwed filler cap where it is broken down by bacteria in the slurry. Heat is an important factor, the process working best at around 40° C (around 105° F). Locating the Digester tank in a sunny area will supply the necessary heat.As gas is produced, it is forced through the Scrubber, which helps to remove any sulfur compounds in the gas.The methane then passes through the cleaner tank, which removes any carbon dioxide from the gas. The gas is under pressure from the header tank.The header tank ensures that the Cleaner Tank has a good level of water, and also puts the collected gas under pressure. The higher the header tank, the more pressure is produced.From time to time, (about 6 months) the sludge is removed from the Digester tank. This sludge, and any liquid recuperated, makes a very good, sterile fertilizer. Any pathogens that may have been introduced are killed off at 40°C, the working temperature of the digester.
Link to the original story: http://kcisupport.awardspace.co.uk/Projects/biogas-mk2.htm
What do you think?
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