In Urban Africa, water and sanitation utility companies are facing a huge backlog of sanitation provision in the informal settlement areas. In order to clear this backlog, new investment is required. However, to select appropriate sanitation technologies, lifecycle costs need to be assessed. The aim of this research was to establish lifecycle costs for appropriate sanitation technologies in informal settlement areas. Three sanitation options were compared: simplified sewerage, urine diversion dry toilet (UDDT) and Ventilated Improved Pit (VIP) latrine. Three scenarios for simplified sewerage were considered; gravity flow into existing conventional sewers with treatment; new-build with pumping and treatment; and new-build gravity flow with treatment. The study revealed that simplified sewerage is the cheapest option for Soweto informal settlement, even when the costs of pumping and treatment are included. Gravity simplified sewerage with treatment is cheaper than the UDDT system and VIP latrine at all population densities above 158 and 172 persons/ha, respectively. The total annual cost per household of simplified sewerage and treatment was US$142 compared to US$156 and US$144 for UDDT and VIP latrine respectively. The costs of simplified sewerage could be recovered through a monthly household surcharge and cross-subsidy summing US$5.3 The study concluded that simplified sewerage system was the first choice for Soweto informal settlement areas, given the current population density.

在非洲城市，水和卫生设施公司在非正式定居区面临大量积压的卫生设施。为了清除此积压，需要新的投资。但是，要选择适当的卫生技术，需要评估生命周期成本。这项研究的目的是确定非正式住区的适当卫生技术的生命周期成本。比较了三种卫生选择：简化的污水处理，尿分流式干厕（UDDT）和通风式改善坑（VIP）厕所。考虑了简化排污的三种方案；重力流经处理后进入现有的常规下水道；带有抽水和处理设施的新建建筑；以及经过处理的新建重力流。该研究表明，简化的排污系统是索韦托非正式定居点的最便宜选择，即使包括抽水和治疗的费用。在所有人口密度分别超过158和172人/公顷的情况下，重力简化污水处理系统比UDDT系统和VIP厕所便宜。每户简化排污和处理的年总费用为142美元，而UDDT和VIP厕所的费用分别为156美元和144美元。简化的污水处理系统的成本可以通过每月向家庭收取的附加费和交叉补贴5.3美元来收回。研究得出的结论是，鉴于当前的人口密度，简化的污水处理系统是Soweto非正规住区的首选。分别。每户简化排污和处理的年总费用为142美元，而UDDT和VIP厕所的费用分别为156美元和144美元。简化的污水处理系统的成本可以通过每月向家庭收取的附加费和交叉补贴5.3美元来收回。研究得出的结论是，鉴于当前的人口密度，简化的污水处理系统是Soweto非正规住区的首选。分别。每户简化排污和处理的年总费用为142美元，而UDDT和VIP厕所的费用分别为156美元和144美元。简化的污水处理系统的成本可以通过每月向家庭收取的附加费和交叉补贴5.3美元来收回。研究得出的结论是，鉴于当前的人口密度，简化的污水处理系统是Soweto非正规住区的首选。