title: A mathematical approach to find long-term strategies for the implementation of resource-orientated sanitation.
abstract: In the present discussion of sustainability centralised water infrastructures are exposed to new challenges, which may cause a conceptual alteration in urban water management. If technologies for closing urban water and nutrient cycles are to at least partially replace existing systems, then intensive reconstruction work becomes essential. The paper presents the development and implementation of a mathematical approach to minimise environmental impact and economic costs on the way to more source-controlled future states in urban water management. To find an optimal transformation strategy, a simultaneous project scheduling and network flow problem was defined as a bi-criteria mixed-integer program. An optimal solution is found by minimising two objective functions concurrently - the economic costs and 'ecologic costs' for the period of consideration. This paper discusses the influence of the weighting of these two costs on optimal transformation strategies for a real catchment in Germany. The results show that the approach can very well support decision makers when showing all impacts of transformation processes in detail. All in all, the developed model can be seen as a first step in strategy-finding for transformations in existing urban water systems.
authors.affiliation: Institute of Urban Water Management, University of Kaiserslautern, Paul-Ehrlich-Str. 14, 67663 Kaiserslautern, Germany. inka.kaufmann_alves@bauing.uni-kl.de
authors.forename: I
authors.initials: I
authors.lastname: Kaufmann Alves
mesh_terms: D003661:Decision Support Techniques; D008962:Models, Theoretical; D012499:Sanitation / Q000706:statistics & numerical data*; D018505:Waste Management / Q000706:statistics & numerical data*; D014881:Water Supply / Q000706:statistics & numerical data*