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Feasibility Study of a Polygeneration Material and Energy Systems in Wastewater Treatment Plants to Increase Sustainability

Ghasemzade Lashte Nesha, Reza | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54578 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Avami, Akram; Borghei, Mehdi
  7. Abstract:
  8. Improper management and inefficient methods such as direct disposal to the environment to stabilize municipal solid waste and sewage sludge in addition to creating environmental problems due to the existence of food cycles, will also cause problems on human health. In this study, a hybrid system is modeled to produce value added in the form of energy and nutrients from a combination of food waste and secondary sewage sludge. This system has 3 subsystems, two-stage anaerobic digestion process that will be accompanied by the production of your bios (hydrogen + methane), the process of recovery of phosphorus from the sludge out of the digestion process and the system of simultaneous production of electricity and heat to produce maximum energy. The gases produced in the first stage are used in a combined system consistingthe solid oxide fuel cell, gas turbine, and steam turbine. The results of this study show the production of 65.9005 L / kg Tvs (1.7538 mol / s) hydrogen in the first stage of digestion and the production of 379.3312 L / kg Tvs (1.2515 mol / s) methane in the second stage of digestion. The results of the nutrient recovery section also show the recovery of phosphorus at 111.5 g / d, with 86.42 g / d, pure Struvite crystal. Finally, 1575.64 kw of net electricity is produced. The electrical efficiency is 84.92% in comparison to 62.6% of single SOFC
  9. Keywords:
  10. Anaerobic Digestion ; Biogas ; Solid Oxide Fuel Cell (SOFC) ; Artificial Neural Network ; Phosphorus Recovery ; Dark Fermentation ; Wastewater Treatment Plant

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