The paper investigates the economic investment of an integrated system including different waste to energy technologies for the exploitation of the wastes from an urban sewage treatment plant. In the considered system, the final waste from the purification plant is fed into an anaerobic digester, and the digested sludge is then separated into the solid and liquid fractions. The former is employed as a fuel in a downdraft gasifier, while the latter is purified by means of both forward and reverse osmosis. Finally, the obtained bio-gas and syngas are used in a cogeneration system based on an internal combustion engine to produce electric and thermal power. The energy conversion performance of the system is evaluated by means of a fully dynamic numerical approach. An ad-hoc library for the simulation of energy conversion systems is developed under the OpenModelica open source platform; the library includes the main components that equip the considered CHP system and they can be connected as they are logically connected in the real plant. Each component is modelled by means of equations and correlations that calculate their performance on a time dependent basis. Furthermore, the library includes the models for the calculation of the investment parameters, such as the cash flow of the plant and the payback time. Finally, the numerical approach is used for the evaluation of the anaerobic digestion – gasification - water treatment integrated plant for the real case of the city Taormina in Sicily, Italy. The simulation demonstrates that it is possible to decrease the final wastes to landfill by a 73% while producing the 30 % of the electric energy required for the plant operation. Thus, the payback time of the integrated plant results to be lower than 3 years.
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|Data di pubblicazione:||2017|
|Titolo:||Economic assessment of an integrated waste to energy system for an urban sewage treatment plant: a numerical approach|
|Autori:||Montorsi, L.; Milani, M.; Francia, M.; Terzi, S.; Venturelli, Matteo|
|Data del convegno:||4 - 8/10/2017|
|Nome del convegno:||12th Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES)|
|Luogo del convegno:||Dubrovnik - Croatia|
|Titolo del libro:||Proceedings of the 12th Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES)|
|Appare nelle tipologie:||Relazione in Atti di Convegno|
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