Does anyone here have experience with long drop compost toilets in areas where the humanure will freeze solid in winter? If I have a cement chamber filled to the brim, will the humanure expand as it freezes and break the cement? Would a pee separator be enough to prevent this from happening?
Backstory: I'm planning to build a bath house with a proper long drop in it. I'd like to pour a cement slab, build 4 cement chambers, and have a little staircase going up to the toilet seats. We would fill one chamber a year (3 years cure time is required by my farm's organic certifier). I've built these before, but it was years ago in a mild climate. Now I'm in upstate NY, and it gets to -30 F every winter. Will my humanure expand as it freezes, and break the cement chamber? Would a pee separator (and proper sawdust applications) be enough to keep the water content down and prevent expansion?
My opinion is not worth a lot here, but I think it might freeze and break... I could be 100% wrong though.
Only experience I have with anything like that is from a childhood of using an out house. Pile got very tall in winter, lucky it was a 2 holer... We sprinkled lime on top each time but not till spring did the level drop.
None of that helps you a bit...
Only someone who has done exactly what you are attempting could give you a proper answer.
Good luck with your plan , I hope someone more knowledgeable will respond.