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Hello all and Steven Bolgiano I couldn't resist giving my input. I have been experimenting with digesting grass and foodscraps in bags and I wonder if you will encounter something similar to me. The upper surface of the 'contents' tended to dry out and harden into bigger chunks. No particular problem as I could 'manipulate' the mass by pushing on the outside of the bag. Large volumes might be more of a problem, as in your case. As Paul Harris suggested a prototype will show up any unforeseen problems, eg solids settling, ammonium build up or engineering issues like getting the stuff in and out etc. Later, you could use the digestate as starter. I got a bit confused by your reference to the water table, however in my case, rain water in the ground underneath the digester robs heat. I believe you have identified the threat but (for others) make sure the the digester footprint stays free of ground water and is insulated well. I didn't quite have a handle on it. kia ora Stephen Rodda NZ Our plan is as follows: |
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