I have always thought of vermicomposting as an end-stage of such a process.
I think mine will start with a greywater-supplied low-flow toilet, to minimise unnecessary liquid additions. I think if I had a need for it, I would run that slurry through a methane digester.
I want to dewater after that point. Ideally, I would pass the black
water through a sand-filter
raised bed, fitted with a cold-frame during the cold months and situated in a hoop house or lean-to
greenhouse that would be open/vented during the hot months.
The filter bed would be planted in heavy-feeding perennials and self-seeding annuals, though I don't know that I would necessarily want edibles growing out of it. I would probably set it up to grow
chicken forage and pollinator food and habitat. It would also be treated regularly with oxygenated
compost extract and fungal slurry.
There would be a drain at the bottom of the opposite end of the bed, and that would take the filtered effluent to a
swale running on-contour above heavy-feeding tree species downslope of it. The leaf
mulch provided by the
trees would make leaf litter, leaf mould, and carbonaceous materials for
composting.
As to the remaining solids, I would first use a Black Soldier Fly Larvae decomposition process, as they seek out feces on their own, and more readily than composting worms. Moreover, while red worms don't like the enzymes that black soldier fly larvae produce, once those enzymes have dried, the worms love the BSFLs leavings.
The BSFL bin, to which the solids would be transferred, would have a larvae chute leading to a central "sacrificial" compost feeding area, where the chooks would gorge on the larvae.
I would move the solids left over from the BSFL process into a raised bed, perhaps even the same one that contains the sand/fungal/bacterial filter, or one like it in the same
greenhouse.
When the worms were done with it, I would be fine topdressing food crops with the worm castings.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein