Organic 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. 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 sulphur 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 frpm
the header tank.
The header tank ensures that the Cleaner Tank has a
good level of water, and also puts the coollected 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 fertiliser. Any pathogens that may have been introduced
are killed off at 40°C, the working temperature of the digester.
