Thanks for putting me on the hunt Yellow Jeep Girl...good thought since we are librarians!
After doing some initial research, I do find that most waste/water treatments systems are meant to be sold to cities and/or the government. I have used a variety of keywords including my favorite to search by: personal waste recycle systems.
So in short, I am still doing some research. I am going to try to do some "book" research as opposed to just Internet research or ask my helpful public reference librarian. :)