Minimal power outputs Coffeeking? The compost we deal with regularly achieves 60deg c + !
Yup, as TINAS says, you're thinking temp, not heat – there's a difference. A spark from grinding metal is at 700+ degrees C, but you can sit your arm under a shower of them and not have it hurt because they carry sod all mass and so sod all heat energy to impart to your arm. What I suspect is that you'll rapidly over-cool the organisms and they'll just work slower. I've finally got my heat exchanger sorted and I@m awaiting a compost bin to carry out the tests on this.
On top of the above, multiple things strike me:
1) It takes a LOT of waste to be composted down to virtually nothing, bothys see very few (relative) visitors with very little waste.
2) It needs management to maintain the composting process, who is going to do it?
3) They're fairly easily "poisoned" – who polices it?
4) Who removes the compost when it's done, and where does it go?
5) Compost and waste will be wrapped around the heat exchanger if it is optimally designed for heat transport, which will make operation a bit 'mareish