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 Building an Anaerobic Digester

KCIS has been workin gon anaerobic digester designs for a while. Apart from efficiency and safety, we have to look at cost.
We want the be able to offer an anaerobic digester to rural communitites so that peple do not have to cut down trees for firewood or charcoal, but we are also looking for a design that will furnish commercial premises (hotels, etc.) with a reliable fuel supply for cooking and water heating.

Biogas - Anaerobic Digester Mk. 2

  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.

We have built the simplest of anaerobic digesters to prove the theory. We did not follow any of my designs due to cost constraints, but have built it so that it can be improved later.
Searching the market for fittings
A locking tap for the outlet
This is what we used for the feed stock
Getting it into the drum was messy
Sealed up and ready to start producing methane
A balloon shows that gas is being produced.
Local resident, Junior, wants to know all about it.
Of course, little boys love smelly gas, the smellier the better.
We're cooking on gas!
We intend to add a storage drum with a water-filled header tank to provide a near constant pressure.

Source: Kenyan Community Support Initiative


Liju Thomas said...

Nice.It will be useful for those who want to know the working of a bio digester.

Anonymous said...

Abdul i would love to know more about this and i have good ideas which can take us up to the highest level of our earning. please do contact me on domicole2@hotmail.com and i will be glad to work this out with you.

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