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Optimisation and costing of faecal sludge management options for Lusaka's informal settlements

Lookup NU author(s): Ruth Kennedy-Walker, David Alderson, Professor Jaime AmezagaORCiD, Dr Charlotte Paterson


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Faecal Sludge Management (FSM) is achieving traction in developing countries as a technical solution for the safe management (collection, transportation and in some cases treatment and end-use/safe disposal) of Faecal Sludge (FS) captured by onsite systems. Whilst some approaches do exist the overall availability of tools, data and practical examples to support decision makers in the implementation of FSM services on the ground is limited. This study aims to address some of these sector limitations by presenting a long-term costing methodology that was developed for two informal settlements in Lusaka, The Republic of Zambia. The approach compares the costs associated with a number of feasible fixed infrastructure and transportation technology scenarios over a 25 year design period. Within the analysis a spatio-topological tool was utilised to model proposed FSM networks and allowed the path of least-time transportation to be identified. This was then used to calculate Net Present Value and Average Incremental Cost, for seven different FSM scenarios, over a 25 year design life. The results of the study show that FSM could provide an affordable solution for the provision of sanitation services to Lusaka's poorest communities. The research conducted aims to support planners in Lusaka but also presents a number of methodologies that could be beneficial to the wider sanitation sector.

Publication metadata

Author(s): Kennedy-Walker R, Holderness T, Alderson D, Amezaga JM, Paterson CA

Publication type: Article

Publication status: Published

Journal: Environmental Science: Water Research & Technology

Year: 2016

Volume: 2

Issue: 1

Pages: 97-106

Print publication date: 01/01/2016

Online publication date: 11/09/2015

Acceptance date: 10/09/2015

ISSN (print): 2053-1400

ISSN (electronic): 2053-1419

Publisher: Royal Society of Chemistry


DOI: 10.1039/c5ew00179j


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