Second thoughts: it looks like Bill is having them.
This is a video demonstration of the Janicki OmniProcessor, a giant machine that can turn sewer waste (including wadded up toilet paper and actual turds) into electricity, ash, and clean drinking water. It's supposed to be a viable solution for developing countries where sewer waste is often dealt with improperly (i.e. dumped in the nearest river). Sounds promising. Even more promising? A machine that turns dirty bath water into cars. I'm a dreamer.
Keep going for an explanation of how the machine works.
Thanks to Francis, who wants to know if that sewer sludge drinking water is Ninja Turtle safe.