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Hello, have a look at the excellent work done by Ps-Eau on this topic: they did a worldwide review of such schemes, highlighting lessons on what makes them work or not (it's almost always down to utility capacity and willingness), as well as a practical guide for implementation. There are case studies from Africa too within the review.

It is the best resource I know; you can also have a look at the resources from Duncan Mara, which are more technical : simplified sewerage and settled sewerage.