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silpol on Home Scale Waste Water Treatment Plant - http://www.reddit.com/r/Frugal/comments/sl54o/home_scale_wast...
"I did not suggest one *should* mix waste streams. yet some of your points might be not necessarily valid, e.g. one about using urine directly as fertilizer - read [wikipedia article on Urine in section Agriculture](http://bit.ly/Im50Yd) to get some hints why it might be not good idea." ‎- silpol