the "Sunny John" moldering toilet (featured in Permaculture Activist magazine(!)
In a nutshell it uses a 45 gallon barrel as a repository, and was set up so that the barrel space was in a solar chamber. This kept the decomposition temperatures high enough to be continuously active, and dried excess water. When the drum was full, it was swapped out.
One design by permaculturalist John Cruickshank called the "Sunny John" uses passive solar design to ventilate, and two side by side toilet chambers for collection. Urine is separated from waste by gravity feed and the waste/sawdust mixture composts in place by smoldering. This out-building is made from strawbale/or adobe with southern exposure windows, additionally you can make a living roof.
https://www.greenhomebuilding.com/QandA/water/compost.htm
think that even in a climate like yours, you'll want to insulate the foundation/perimeter of your greenhouse, down to below the frost line. 4-6' is as deep as you'd likely go with your foundation & soil mass no matter what. I doubt your frost line is that deep but you'd likely insulate the entire foundation anyways.
http://www.ecosystems-design.com/blog/reviving-sunnyjohns-work
https://web.archive.org/web/20031230110441/http://www.sunnyjohn.com/
There are a few composting toilets that carry National Sanitation Foundation (NSF) certification and would be hard for an inspector to flag but could be restricted by code, usually these are multi bin type. I have a Biolet (I think with out looking) I is a single bin and really only suitable for a cabin use since the 'finishing' requires 6-8 weeks with out new deposits, this can be done with a outside compost pile, but that puts the un treated waste in the environment.
https://forum.solar-electric.com/discussion/18177/compost-toilet
http://www.duntonfarms.com/projects/2006_toilet.htm
This was the initial purchase. It is a 54 gallon (204 liter) Rubbermaid tote and cost $16.97 at the Home Depot. The design hinges on the size of the chamber you will use. We plan on using two such bins in rotation.
Sunny John – A Solar Composting Vault Toilet
We are currently working under an experimental permit process with the Pitkin County Department of Environmental Health & Safety (EH&S) to design, build and monitor the Sunny John solar composting waste treatment system, so that it will become a legally approved and widely adopted solution.
http://sustainablesettings.org/civic-influence/
If you don't have a copy of Jo Jenkins book, the Humanure Handbook, get one. I have used an outdoor sawdust toilet pile for 3 years and even have had the DEQ admit that it is a viable legal system in Montana, as long as it is not a nuisance to the neighbors.
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i have a medical potty..i put paper towel in the bowl so i do not ever have to clean the bowl after i go...i go in the paper towel and burn in my wood stove that burns 8 month's a year...been doing this for 30 year's...another thing that works is to go in a bucket and cover with sawdust..no smell either but the stove way is faster and easier...i pee in a qt mason jar and take outside every other day
https://elootoilet.com/how-it-works/
$6 grand!!
we have never had that problem if you do it the rjght way they dont freeze ares is surrounded witha thick layer of leaves,when you go to use it go into the middle and pull toward you and do that all around then dump into the middle the heat stays there ,then you put straw on top. and leaves all around ,we were at 1 degree and it never froze.if you are worried put a layer of plastic on top.still the hole point besides removal is to use the waste. if you live off the land gardening is 100/ of your life . letting this go into the ground is waste,and you cant afford to waste anything.in the old days nothing went to waste.
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