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As prices of bricks and sizes may vary, for users that want to build the installation by themselves an excel sheet (open docs) can be used to calculate costs based on the volume needed to fabricated the biodigester.

This allows to estimate how many bricks are needed and the total costs, but also it can include references to outlets, and pipes prices..

It can work as a cost checklist

Hi Chuck, based on our last meeting, I summarize what we discuss that we can improve in the documentation, I list somethings that need to be done to start completing the documentation. I also open a branch for new documentation.

1. Reuse the template of the CNC machine, or the grapples as a reference to adapt (This I will do)
2. A key thing in the biodigester is how is used, and why is a good solution for the context you are using it, what are the products that you get from the process, those things you explained.
3. Put proper references and specify as much as possible the context of use of these kinds of digesters, like climate conditions, etc.
4. Start documenting the fabrication process, which is relatively simple to do.
5. I can help in making illustrations that explain the biodigester architecture, how is build.

But the point here is to give a brief introduction, and mainly document how to use the materials her.

I think is also interesting to consider that this design can variate, and adapt. In case people would like to redesign then it would be great to have design recommendations.

Other than that you mentioned that in this context of small farms, gas could be used in tropical contexts to make aircos. This is also an interesting design issue, to outsource through the community.

Maybe @cubar can explain better. But basically we talked about a device that could be introduced in the digester to maintain the slurry mixed inside?

There is a lot of banana trash available on this little farm.
A digester produces best at C/N levels of about 25.
Cow dung turns out to have a low C/N ratio, 12 C versus 1 N atom if I recall right.
Banana trash seems to have about 35 C/N ratio.
We need to study this to know how much banana we can feed the digester.