We have run anaerobic digesters and naturally the sludge goes to the bottom
and slows down the reaction. A simple solution is to lay a network of ½"
plastic pipe on the bottom of the tank, pick up the gas or liquid at the top
and pump it back through the sludge. This will keep the sludge stirred up so
digestion is fast.
If you want to hold 90-95F just pump the gas-liquid through an above ground
network of plastic pipe. In cool weather the sun will warm it, in warm
weather you do the same thing at night and the gas-liquid will cool off. It
is easy and a low cost way of holding the proper temperature as well as
keeping the sludge stirred up.
I can provide more details, feel free to spread the idea around.
Stuart A. Hoenig
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