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The silly thing is, that in it's very basic form, if you divide liquid and solid wastes at the point of exit, solid waste composts easily and readily, with some carbon additives and air. It is very low tech. Not so good in flood prone areas (without additional acre), and one has to be environmentally aware to say the least. But education is a winner here. I'm tied into a shitty contract with a plant owner that is operating illegally. And I've looked at alternatives, but the simplest really is just a bucket that is carried out to the garden. Posh compost toilets are just buckets in chambers that are well ventilated. If you have the space, you can incorporate the chambers into the house and preferably have some ability to rotate. Otherwise it's a case of emptying in a rodent proof heap. You can always compost twice. At least you can then use the waste. Rather than having to pump out sludge that may contain other household contaminants.