Pooh is useful too.

Not this kind of Pooh.

This kind of Pooh.

Some people think that collecting pooh is

weird.

Ok, this is a bad example!

Collect enough of the good stuff and you could be on to a winner, by popping it into one of these.

An Anaerobic Digester.

What is Anaerobic Digestion?

Put simply, Anaerobic digestion means using micro organisms, that thrive in an environment starved of oxygen, to

break stuff down.In this case the stuff being broken

down is Pooh.

What’s in it for me?

Methane gas

Free, super rich compost

Lower/no sewerage bills

Preserve natural resources

You Need Pooh(And a lot of it.)

1000lbs of human waste produces about 0.6 cubic meters of methane (BioGas)

1000lbs of Pooh, that’s pretty tough.

Producing enough BioGas (Methane) from a small

household may not be viable as a single resource, but there are many communities, such as in India, the Philippines and Haiti that already use BioGas on a

community level.

Can I give my Pooh a boost?

Time to get your thinking cap on.

Feedstocks which can be added to boost BioGas production.

(Other sources of Pooh and good stuff.)

Why are other feedstocks important?

The microorganisms that produce methane (BioGas), do so by breaking down acids in Pooh

(very complicated scientific stuff.)

Our Pooh is very acidic because of what we eat and how it is processed.

Introducing things like Barley straw and animal manure, creates a more rich and balanced

environment inside the digester, which means more BioGas.

Simple Bio Digester designs.

A simple design using an inverted water sealed barrel and a tank for collecting

the gas.

A slightly more complex design for the home or small

project.

Community Scaled IdeasBioGas digesters lend themselves extremely

well to large scale community projects, as the feedstock (Pooh etc) can be collected in much

larger volumes.

Totally Tropical PoohMicro organisms responsible for producing BioGas work

well in warm conditions, such as in the tropics.

So, if you are planning a project elsewhere it is worth considering what sort of digester you will use, and how

you will keep it at the ideal temperature.(Ideal conditions exist between 45-55 degrees

centigrade.)

Is it worth the effort?

You decide.

Links and useful resources.

http://large.stanford.edu/courses/2010/ph240/cook2/

http://www.appropedia.org/Biogas_from_human_waste

Any Questions?