Recently posted an article on how a Rwandan prison was using their inmates fecal matter as a means to "keep the stove burning". Now here's something about a company called Water Security. They've got the technology which will filter the nastiest things you can think of, from sewage run off in Jakarta, to your urine and sweat, and produce water which passes EPA (Environmental Protection Agency) standards.
http://www.wired.com/wired/archive/13.08/urine.html