A small team and I are working on a project to build a small-scale biogas digester with the intention of use in rural Africa and this got me thinking on AAT themes.
A digester is quite a simple machine; basically a large tank with some inlet and outlet tubes, with a gas pipe on top. Additional tanks can be included for gas storage or secondary digestion, but the essential design is of one main tank and no moving parts. Animal, food or human waste gets put in with water, and methane gas comes out along with slurry that can be used as fertilizer. The methane can be used for lighting or household cooking.
Now, imagine it is set up for nomadic pastoralists who have herds of cattle. A small team will need to be trained in its use and maintenance, and of how to transport it. Although its design will use the latest technological knowledge, materials and use of the machine will only require basic understanding and should pose few problems.
Can you see where this is going? You might have guessed by now.
One key instruction would be to work to a set routine. For a digester a 40 day cycle would be appropriate, for removal of slurry and cleaning/maintenance. It may be more efficient to empty it when deemed appropriate but this requires judgment, therefore a schedule would be more reliable and simpler to stick to.
So, what would they call it in their language? They cannot call it a biogas digester because those words will not exist. Maybe they will simply call it “transportable tank” or some other direct meaning name. “Transportable tanks” (with an S) in Hebrew through a process of evolving language can translate to “ancient of days”.
Maybe to poor guys carrying or pulling this thing will call it something else. Maybe they’ll call it bloody heavy. In Hebrew “heaviness” oddly translates to “glory” – the glory of the LORD. The team in charge would be a privileged group, and in this case responsible for fertilizer and methane gas. The Hebrew priesthood wanted gold, whereas this team require cow dung – so some difference there.
There are many similarities between a biogas digester and a manna machine, but some key differences too. But the idea that a machine – designed elsewhere – involving pipes, tanks and liquid being used by non-technological people is a plausible scenario.
Technology already exists for additional features like a solar powered dew-still to extract the water from the air (See Element Four's website). All of this is still in the early stages, but algae, chlorella and many other ways could be developed for gas, fertilizer or even food production in the future that use natural processes for intensive reactions.
Could such a machine (or machines) have been created long ago? And one such machine ended up in the possession of the Hebrews? The evidence certainly points this way but much more needs to be done.
I do find it rather funny that I could sensibly ask “Could the God of the Old Testament be a biogas digester?”. What a strange world.


