I came up with a very simple odorless, waterless toilet design that works great!
I've been using it for about a year in my motor home with no problems.
I used a 5 gallon bucket with the snap on seat for camping and added a 12v computer fan to the bottom and side. The fan exhausts out the vertical vent pipe made for the conventional water flush toilet.
The fan dries the feces by up to 75%. There is almost no smell as the toilet is flushing constantly during and between uses. For my one person use I have about 1/3 bag of dried feces to empty every 3 weeks.
Inside the bucket I use a paper grocery bag inside of a heavy plastic bag. I like this better then bio-bags which I used at first. The paper bags bio digest and the plastic bag remains in the bucket a number of times before it gets recycled. I cut a whole in both bags in front of the fan and tape 1/2 of a paper plate over the whole to keep the fan clean. I never have to stir. Clean up is not messy or smelly. I usually find an out of the way place to bury the bag, but it could be added to humanure pile.
I don't see why this design shouldn't work well in a home or could stand alone outside. The venting could be horizontal as long as it takes the odor away from the use area. The odor from the end of the vent is not intense for long since the feces crusts over quickly.
I keep urine and paper separate but sometimes for guests put I put some straw in the bottom and add a second plastic bag for the extra moisture of the urine. I Let them add the paper too. When I do this I have to empty every 2-3 days.
My 12V comes off my solar system but a small solar panel and or small battery could power the 80 ma fan easily.
Feel free to mail me with questions. Dave S
another simple compost toilet is a 5 gal bucket with a camp toilet seat set over the top of it..you put some pet bedding or cedar chips in the bottom and everytime you use it you add a handful of the chips over the top..if it smells you might also want to toss in some wood ash if you have it..you could line it with a bag to make the emptying and cleaning easier..put the residue in a compost area for a year before adding to the garden..some suggest only using it on hardoowds or non foods but that would be up to the individual to decide.
Bloom where you are planted.
GiveLove.org - "When you work on improving sanitation, like we do in Haiti, you start to really see the big picture. Sanitation is the keystone to solving so many problems in the world-- improving public health, reducing child mortality, recycling and reducing waste, and protecting water resources -- and yet no one is really talking about the problem of untreated sewage or the fact that 40 % of the world’s poorest people live without a toilet. The global community needs to commit resources to finding sustainable solutions."
Joseph Jenkins has done some great work on "Ecological Sanitation" (bold new approach to sanitation and resource management that recognizes the importance of recycling)
As you probably know the "humanure toilet" concept is based on Jenkins book, The Humanure Handbook.
As long as humanure is not allowed to contaminate ground water before its complete conversion to soil, it is the future... but I am afraid the future may be too far off...
His Loveable Loo Toliets are pretty neat too... but require a lot of sawdust, which yours does not.