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Model for Technology Assessment of Energy-water Nexus and Municipal Wastewater Treatment

Hosseini, Masumeh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50682 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. Environmental and economic scarcity of resources are the most important challenges of industry sector. Iran confronted with lack of sufficient water resources and proper management and faces with drought and its environmental and economic consequences. It is a complicated challenge to provide the water demand without any damage to the ecosystem and it needs to do social, economic and environmental assessments. Wastewater treatment (water recycling) is an alternative option for supplying water demand. Wastewater treatment system (collecting, transportation to the treatment plant, wastewater treatment, and discharge) designed in order to solve hygienic and health issues in first place, but it has become a way to reuse water for different purposes because of water resources scarcity. Wastewater treatment system consumes a considerable amount of energy which leads to the increased costs. So focus on Energy-Water nexus and using and optimization of available potential for energy and water recovery is a considered as a necessity. In the present study, water and energy recovery potential investigated for Varamin city and an optimization model has been developed and applied for water and energy recovery technologies in domestic wastewater treatment systems. A comparison has been done between centralized and decentralized wastewater treatment systems. Optimization has been done using four scenarios: "Basis scenario", " Network electricity competitive price", "Optimum cost of the photovoltaic system" and "sludge importation". In basis scenario, decentralized management of wastewater and as a biological treatment process, Oxidation ditch technology for Varamin city and Aerated lagoon for Kheyr Abad city are chosen. Anaerobic digestion with CHP is chosen and provides  of total electricity requirement of wastewater treatment system. Three other scenarios investigate in the "wastewater treatment plant energy self-sufficiency". In the Network electricity competitive price scenario if the electricity cost is  USD per kWh, the renewable energy of hydro-power and CHP power will be cost effective and network electricity will not be economical. In the Optimum cost of the photovoltaic system scenario, investment cost for PV instead of network electricity has been assumed to  USD per watt. In the sludge importation scenario, if sludge importation has been assumed to  ton per day, centralized wastewater treatment system is chosen. This model can be used as a decision-making tool for policymakers to provide them with reliable database for the sustainable development
  9. Keywords:
  10. Sustainable Development ; Economic Optimization ; Mathematical Modeling ; Water and Energy Nexus ; Modeling ; Self-Sufficent Energy Service Network ; Wastewater Treatment Plant ; Wastewater Disposal System ; Energy Recovery

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