If you have to carry water maybe a yoke
would help, similar to what was used in England years ago.
Wood you like to
make your own free fuel gas for cooking? It is
- It can be made from animal manure, plant materials,
human excrement, kitchen waste, or a mixture of any of
Production of biogas has many advantages:
- It is free to make, once you have built or bought the
tanks for production and storage.
- It is a clean burning fuel, producing no smoke, thus
giving a cleaner kitchen and cleaner air to breathe.
- It saves on the use of heavy, bulky, expensive fuels
such as kerosene, wood or charcoal.
- The material left after all the gas has been made is a
very rich fertilizer that can be used on the fields.
- Biogas digesters are a safe way of disposing of animal
and human dung.
- Anaerobic decay in bio-digesters produces less less
harmful greenhouse gases than the alternative aerobic decay
But there are disadvantages:
- The tanks for production and storage can be expensive.
- There is a small risk of explosion, so produce and use
- It is a complicated process, requiring effort, time and
some money to start, and no guarantee of success.
- Biogas is best produced at temperatures between 32-37
degrees C, and will not work below 15 degrees C.
- Biogas, or methane, is not toxic, but should not be
- Biogas production has been recommended for at least 25
years - but it appears not to be in widespread use - so
maybe it is not a viable way of producing fuel. By
1993 approximately 5.25 million farmer households had biogas
digesters, producing 1.2 billion cubic metres of methane and
3500 KW of electricity. (ITDG)
email me if you
produce and use biogas - we would love to hear from you.)
- Large volumes are required: 1 cubic metre could cook 3
meals for a family of 6 (ITDG)
1 lb cow manure could produce 1 cubic foot of gas - enough
for a day's meals for a family of 5 in
To build a small, experimental biogas unit you will need:
- Two drums that fit inside one another - a standard 200
litre oil drum, and a smaller 120 litre drum are good.
- A piece of metal pipe approximately 10 centimetres long,
and 2 centimetres diameter, for the gas outlet.
- A valve to fit this gas outlet.
- At least 10 m of rubber or plastic tube about 2 cm in
Location of your biogas plant:
- Approx. 10 m from your home - to avoid smells.
- Approx. 5 m from your cooking area - to reduce the
length of the gas line.
- 15 m from your water supply, to avoid pollution of your
- If you live in a very hot place put the unit out of the
sun, in the shade of a tree or building.
- If you live in a cool place put the unit in the sun, or
even underground or covered with earth or straw.
How to build the unit (See the link for more detailed
How to build a small scale example digestor):
Size and capacity:
- A 1 cubic meter digester requires 25 kg cow dung daily,
from 2-3 cows, and will supply 2-3 persons with enough gas.
- A detailed description, with costs and pictures, of a
sophisticated plant in
India ($30,000, 2007).
- Detailed analysis of costs and benefits, in India 2007 (ROI)
- The worlds 900 million cars and commercial vehicles
cause less global warming than the world's 1530 million cows
this site is still under construction - further content to