Tyler August wrote:It is a solved problem, but not one you're likely to find at home depot:
The Lineur system. A brief description is buried in this article, which is where I heard about it. In short, it's a vaccum toilet; differential air pressure carries waste away to be composted without diluting it with water. Some cities in Europe maintained these systems well into the 20th century, before eventually switching over to the water-wasting sewers we all know and love to hate.
But they still make pressure-operated fixtures for trains, planes, and ships. In fact, google tells me Sealand sells them under the name VacuFlush. Is that the type of SeaLand toilet you meant? In that case I'd say go for it. I've no experience with Humanure, but if it worked on the city-scale back at the turn of the last century, there's no reason it shouldn't work for you.