From the IPS, writer Lewis Mwanangombe explains how the toilet works.
Kellner and his team at WASAZA are busy pushing on with developing and popularising a latrine that will separate human waste into two components - urine and solid matter, so they can be processed into two different forms of manure.
Kellner is piloting a system called a "fertiliser-producing toilet" which focuses on re-use of solid waste. Such a toilet, once integrated into gardening, will never fill up.
When a user sits on one of the new toilets, the urine will go one way to a storage tank fitted with a compressor and a valve, from where it can be collected for direct use as liquid fertiliser after dilution.
The solid waste will fall into a shallow pit where it will be covered with soil and compacted; it will dry it out and neutralise it before it is ready for use as fertiliser. Any smell is vented out through a pipe.
"The original idea is to enrich the vegetative growth in our immediate vicinity. But it can be sold at prevailing prices. These days dried sludge from sewerage works has a price of ZMK7,500 (around $1.60) per ton," notes Kellner.