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systems described by Otis (Chapter 9), for surcharged flow. One Zambian systemthat at Chipanda in Matero Township, Lusakais described below, but several others exist and are described elsewhere (Feachem et al., 1978a, 1979; de Kruijf, 1978). |
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The Chipanda system, which was installed in 1960, serves 532 households. Each aqua-privy block serves four households, and immediately outside its toilet compartment each household has a water tap and a sink which discharges its sullage into the aquaprivy tank (Figures 7.1 and 7.2). The tank effluent discharges, via a 100 mm asbestos cement connector pipe, into a 150 mm asbestos cement lateral sewer which runs between most of the compounds. Originally the settled sewage was treated in a series of waste stabilization ponds, but these were abandoned when the settled sewers were connected to the city's expanded conventional sewerage system. |
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Figure 7.3
Sanitation block in family compound in New Bussa, Kwara State (Nigeria) |
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