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Feasibility and Supply an Optimal Integrated Model of the Energy and Exergy for Producing of Biogas and Ethanol from Solid Waste and wastewaters flows: in Tehran

Vali, Fatemeh | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49543 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Avami, Akram
  7. Abstract:
  8. In recent years, access to clean energy sources is the major instruments for sustainable development. Limitation of energy resources and the problems resulting from the use of fossil fuels was caused attention to biomass in different countries as a stable source of renewable energy. Organic waste in municipal solid waste and domestic wastewater are biomasses that can be used as a raw material used in the production of energy. Practical studies show that quality and quantity of municipal solid waste to produce biogas and bioethanol in Iran is very appropriate. In this process, the household solid waste and wastewater are in the anaerobic digestion reactors and fermentation systems without any interaction with the environment under the influence of anaerobic and fermentation microorganisms. Productions are biogas, electricity, heat, fertilizer and ethanol.The aim of this project is finding the optimal route for energy conversion of solid organic waste and wastewater of Tehran. Biogas and bioethanol production using elemental analysis of wastewater and solid waste in Tehran is simulated. In this simulation, the economic feasibility of gas-fired power plants was done. In this simulation, Exergy flow in each systems was checked and by entering equations of Exergy balances, the optimum case with the aim of minimizing Exergy destruction is achieved. So the objective function is minimizing of overall cost and Exergy destruction and constraints are related to mass and energy balances for devices, available economic relations for both ethanol and biogas, relationships and balances of the Exergy both parts. The decision variables are also related to the capacity of solid waste and wastewater.In the optimization with the economic objective function, developed model prefers that import all wastes in fermentation systems and only available wastewater to produce biogas import in anaerobic digestion. In the optimization with objective function of minimizing the Exergy destruction, model prefers that import all solid wastes and wastewater with a molar ratio of 80 to 20 into the digester so that damage is minimized. In the last level, with achieve cost of Exergy destruction that accounting in the second section and addition this cost to objective function of first section,can optimize model with two objective functions. This section model also prefers import of all wastes and wastewater in anaerobic digestion systems
  9. Keywords:
  10. Biogas ; Bioethanol ; Economic Optimization ; Municipal Solid Waste ; Municipal Wastewater Treatment ; Tehran ; Exergy Destruction

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