When I was a child, the town I lived in maintained a "sewage farm". The waste from the towns sewage system was pumped onto fields, where it was allowed to dry and was then ploughed into the ground and used to grow crops or carried away to enrich other fields in other farms.
Sassy's comments here are entirely appropriate and highlight the extent to which, in our obsession with "hygiene" we have lost touch with reality. We flush away our body waste with relief, but to fail to realise its relevance in the great cycle of life. Without ours, other people's and other animal's faeces we would probably starve.
Do you remember The Onedin Line? The early episodes were concerned with carrying "guano" to be used as a fertiliser.