Best Sanitation Innovations in Africa

I am a sustainable development journalist based in Cape Town and I am working for Grid Arendal, a Norwegian environmental sustainability organisation that works closely with UN Environment and other partners. I am looking at simple and effective innovations that tackle access to sanitation and improve overall sanitation in the developing world. Think about the algae-based wastewater treatment method by the CSIR or Micromune by Sanitation World. What about waterless sanitation innovations?   Ideally, I am looking for innovations and technology developed in Africa, but it is not a prerequisite, as long as it is used/can be used in Africa. I would love to hear from you (and interview you, if possible). Which sanitation innovations applicable in Africa do you consider best?