Would anyone care to discuss composting? There was an article in Progressive Architecture magazine awhile back that brought my attention to the composting toilet; this article featured the Swedish made Clivus Multrum. They note that 90% of household water use was contaminated black water from the flush toilet. This system is aerobic and odorless. It cost about the same as a septic tank. Whole Earth Catalog had one designed by an architect; you could build it yourself. It too is aerobic and odorless.
I once had a rather thick book on composting, published by Rodale. On a larger scale an anaerobic system as on a farm can be used to generate methane gas (the main component of natural gas) which is used for fuel and energy production.