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Accueil du site → Master → Pays Bas → 2019 → Optimisation tool for integrated management of wastewater treatment : introducing the energy factor in an analysis of decentralised wastewater gravitational collection and reuse systems

UNESCO-IHE Institute for Water Education, Delft (2019)

Optimisation tool for integrated management of wastewater treatment : introducing the energy factor in an analysis of decentralised wastewater gravitational collection and reuse systems

Maria Wunsch de Alvarenga

Titre : Optimisation tool for integrated management of wastewater treatment : introducing the energy factor in an analysis of decentralised wastewater gravitational collection and reuse systems

Auteur : Maria Wunsch de Alvarenga

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2019

Résumé
Treating domestic wastewater is a problem unsolved in many cities in developing countries. Using decentralised treatment facilities to treat the wastewater is an alternative that is gaining more attention, despite the choice for centralised systems being still the most traditional one. Combining both configurations can be the optimal solution depending on each location’s terrain, economic, social and environmental characteristics. In the Kidron/Nar basin, south-east from Jerusalem, the complexity of planning a wastewater treatment system is increased due to the region’s political situation of the Israeli/Palestinian conflict. Matanó, et al. (2018) developed the Automatic Optimisation KidronNar Project (AOKP) algorithm, a multi-objective optimisation framework based on a cost-benefit analysis performed for different wastewater treatment configurations for one town of the Kidron/Nar region. This thesis brings this framework further, expanding the analysis at a regional level and using evolutionary optimisation algorithms to evaluate different configurations of wastewater treatment plants of different scales ; besides costs and benefits, energy consumption and reuse interest that are also included. The methodology consisted of literature review, field visits, energy and water flows analysis, definition of objective functions to be added to the algorithm, execution of the evolutionary multi objective optimisation and analysis of results. Two configurations with different degrees of decentralisation, one with 7 and another with 27 wastewater treatment plants were analysed, as well as their benefit/cost ratio and coverage as objective solutions. Results show that there is no considerable difference between the total costs and benefits presented by both options. However, the management of reclaimed water was more energy-efficient in the configuration with the highest degree of decentralisation. Finally, the use of MBR as treatment technology appears more adequate in decentralised systems since it presents lower costs per m3 when compared with the CAS technology, for smaller plants. The tool can be used as a powerful instrument for decision making, since it gives an estimation of costs and benefits and can provide a good understanding of the possibilities of reclaimed water use. Identifier

Sujets  : wastewater treatment plant domestic wastewater decision making wastewater reuse systems Israel

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