Hi Miriam,    There is a ...

Hi Miriam, 

There is a company called Isidima Design and Development situated in Cape Town that has developed a low-flush toilet for both developed country and developing country use called Arumloo. Envriosan is also South African and has developed a pour-flush and low flush toilet in plastic.  There is also the company, Enviroloo that has a composting dry toilet technology, they are also South African. The Earth Auger was developed in Washington, but is definitely applicable to the African context. The Earth Auger is a UDDT (urine-diverting dry toilet) that moves the dry waste away from the toilet site using an auger. There is a the Arborloo that was developed in Zimbabwe, but this is better for rural contexts as it involves using a pit and then moving and planting a tree in the spot where the pit has filled. These are the toilet technologies, although with the enviroloo and the Arborloo, it is a treatment (using composting) and storage solution as well.

I know the Isidima Design and Development has also worked with ecological water treatment using John Todd's Eco-Machine, but this has not been done on domestic wastewater yet. 

If you contact any of these companies I am sure they will know more about the innovative treatment options used.