We used a system similar to Joe Jenkins bucket system. We used a 3 bucket system under a hinged bench in an outhouse. With 2-3 people using the toilet regularly I had to empty the 3 full buckets into the compost pile every 10 days or so. We used poplar sawdust from a planer from a local woodshop. There was never any smell issue. Basically we would just pee outside when we had to pee, but pee in the bucket when we crapped. This might not be possible in very urbanized areas.It is beneficial to have some pee in the bucket system, because it is absorbed by the sawdust in the bucket. The nitrogen in the pee combines with the carbon in the sawdust, which is what allows the compost heap to actually heat up to 120 degrees or more. If you separate the pee, you just have a turd here and there and a bunch of sawdust, and the pile won't heat up as much. You need the nitrogen-filled liquid (pee) to break down the humanure evenly.
In the beginning, it might take a couple weeks to get the balance right. But after that it is easy to keep the proper balance of liquid pee to sawdust in the bucket.
Happy crapping.
