In rural and suburban contexts handling manure and converting it to fertilizer is a solved problem: <i>Eisenia foetida</i> (& co.)<p><a href="https://en.wikipedia.org/wiki/Vermicomposting" rel="nofollow">https://en.wikipedia.org/wiki/Vermicomposting</a><p>and Vermicomposting Flush Toilets:<p>> A simple, proven, low tech and open source approach for ecofriendly human waste disposal<p><a href="http://www.vermicompostingtoilets.net/" rel="nofollow">http://www.vermicompostingtoilets.net/</a>