in the 90's I sold Sun-Mar composting toilets. They used a drum that you rotated to mix everything up daily. Each use, some form of carbon was added such as sawdust, leaves, ground corn cobs and so on. The carbon and nitrogen combined, composted and heated to kill any bad bacteria we put in through our feces and produced good compost that some people used in their gardens. I have one still and use it in my cabin. I call it my indoor out-house. 90% of our waste is moisture and the toilet evaporates that while composting the solids. I only emptied it about 2 times a year. Go to Sun-mar.com to get more information. They are made in Canada and are not expensive compared to a septic system. The concept is easy to implement without buying one of the products .