114 Organic waste recycling: technology and management
Figure 3.9 Schematic diagram of a ventilated improved pit latrine (Morgan and Mara
1982; reproduced by permission of the World Bank)
When the tank is about two-thirds full, it is filled to the brim with dried
powdered earth and kept under anaerobic conditions for a few-year period.
During this time, another tank is used for defecation, and the cycle is repeated.
The anaerobically composted products were reported to be rich in nutrients and
hygienically safe for reuse as fertilizers (McMichael 1976).
Odours FliesScreenVent pipeAir currentsFliesPITPit cellarPit contents