Bio Gas

[neil]

Hi I have a 5000lt ces pit supplied from my home,plus 2000lt from my mums house next door.

been thinking about drawing gas from this to use as fuel for cooking ect.

any ideas about the amount of gas to be collected and any ideas on how to obtain said ges would be most welcome.

thanks neil   

[Alan]

Hello Neil

Only a go if you and Mum next door maybe rent out every square inch of all floor space as bed space. And supply food / Curry – Beans every day you would be in with a chance. Might be the odd riot if you don’t fit a few more toilets.

Far better to mix grass cuttings and a bit of Moo cow poo if you have access to a friendly farmer. The production is straight forward and also storage at low pressure.
The gas calorific value and water content is variable depending on production. You will need a heat source to get gas production underway. On small / medium size systems the gas in burnt in hot water boilers and the hot water is circulated in the bio digester to keep the production going. Like a gas bio system on a ship it only needs one good dolup of bleach put down the toilet to kill all the Buggs. Then Volunteers are needed to go inside the digester and dig it all out.

Regards

Alan

[KenB]

Neil,

Have a look at the system developed by Dr. A. Karve of the ARTI Institute

http://www.arti-india.org/content/view/45/40/

This is a compact biodigester that uses garden and sugary/starch food waste.

If you start with green waste rather than material that is already digested, then the gas output will be much higher - by a factor of about  20.  (And a lot less smelly!).

You will need some cow dung to get it started - as the dung contains the necessary methane producing microbes.

Another approach is that of Jean Pain, who used composting techniques to produce methane and hot water. His work is illustrated in a couple of YouTube videos.

http://uk.youtube.com/watch?v=JHRvwNJRNag



Ken

[neil]

Hi all thanks for info.

i live in country side and friendly with farmer near by so can get all the cow poo i want.

anyone have detailed drawing of a digester that i can work from.

space is no object i have a 20m x 8m barn to use.

thanks Neil

[Ivan]

There are plenty of designs on the internet. Make sure you build one with an agitator - as you need to break up the scum regularly for optimal gas production.

[Flamethrower_]

Otherwise known as stirring the $hit

[martin]

otherwise known as a general election!