Okay- I learned this from a boating forum, and a "tree-hugger" person. All we need, apparently, is a five gallon type bucket- a shorter one, of course, which fits into that potty spot in the Scamp!
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You "go", you cover it with a handful or two of chips/sawdust. You can empty it in any trash or he says he puts it into his compost pile. He swears there is no odor either- as long as you aren't keeping it for weeks, of course!
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I've found that a half and half mixture of wood chips and peat moss works well.
Composting action starts immediately. As long as it has plenty of air, airobic composting takes place, which doesn't smell. The trick is to keep it warm and moist, but not wet.
During the years we were market gardening, we had a composting toilet made by SunMar for the field. It worked amazingly well. We did not empty it into the compost (a little too close to the food source) but added it to a worm bin for kitchen scraps. The worm castings were then used for the flower beds.
Emptying was only needed once or twice a season and the amount was perhaps two or three gallons of dry fluffy compost. The toilet had a thermostatically controlled heater and a fan that vented the unit full time.
I see no reason why a system of that type wouldn't be ideal for an RV.