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Thermoeconomic assessment of a sustainable municipal wastewater treatment system

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  • Abusoglu, Aysegul
  • Demir, Sinan
  • Kanoglu, Mehmet

Abstract

This paper presents the thermoeconomic analysis and assessment of a municipal wastewater treatment system. Operation of an existing municipal wastewater treatment plant is described in detail and a thermoeconomical methodology based on exergoeconomic relations and the specific exergy costing (SPECO) method is provided to allocate cost flows through subcomponents of the plant. SPECO method is based on a step by step procedure which begins from identification of energy and exergy values of all states defined in the present system through fuel (F) and product (P) approach and ends at the point of establishing related exergy based cost balance equations together with auxiliary equations. The system treats nearly 222,000 m3 domestic wastewater per day by using the primary and secondary treatment systems. Activated sludge is digested in the anaerobic digestion reactors to produce biogas with a 60% methane content. For each 1 m3 biogas produced in the wastewater treatment plant, 68.26 kg of sludge with the dry matter content of 5.0% is digested. The de-watered digested sludge with the dry matter content of 22% is considered as a waste and used for agricultural land applications, currently. The actual exergetic efficiency of the wastewater treatment plant is determined to be 34% which indicates that 66% of the total exergy input to the plant, mainly by sewage and power consumptions, is destroyed. The exergetic cost rate and the specific unit exergetic cost of the treated wastewater at the exit of the WWTP are found to be 62.05 $/h and 3.804 ¢/m3, respectively. The corresponding costs are 81.90 $/h and 1.907 ¢/m3 for digested sludge at the exit of secondary anaerobic digestion reactor and de-watering unit; and 175.9 $/h and 13.48 ¢/m3 for the biogas produced at the exit of primary and secondary anaerobic digestion reactors, respectively.

Suggested Citation

  • Abusoglu, Aysegul & Demir, Sinan & Kanoglu, Mehmet, 2012. "Thermoeconomic assessment of a sustainable municipal wastewater treatment system," Renewable Energy, Elsevier, vol. 48(C), pages 424-435.
    • Handle: RePEc:eee:renene:v:48:y:2012:i:c:p:424-435
    DOI: 10.1016/j.renene.2012.06.005
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    References listed on IDEAS

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    1. Lazzaretto, Andrea & Tsatsaronis, George, 2006. "SPECO: A systematic and general methodology for calculating efficiencies and costs in thermal systems," Energy, Elsevier, vol. 31(8), pages 1257-1289.
    2. Abusoglu, Aysegul & Kanoglu, Mehmet, 2009. "Exergoeconomic analysis and optimization of combined heat and power production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2295-2308, December.
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    5. Lamas, Wendell de Queiroz & Silveira, Jose Luz & Oscare Giacaglia, Giorgio Eugenio & Mattos dos Reis, Luiz Octavio, 2010. "Thermoeconomic analysis applied to an alternative wastewater treatment," Renewable Energy, Elsevier, vol. 35(10), pages 2288-2296.
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    3. Colmenar-Santos, Antonio & Zarzuelo-Puch, Gloria & Borge-Diez, David & García-Diéguez, Concepción, 2016. "Thermodynamic and exergoeconomic analysis of energy recovery system of biogas from a wastewater treatment plant and use in a Stirling engine," Renewable Energy, Elsevier, vol. 88(C), pages 171-184.
    4. Zare, A. Darabadi & Saray, R. Khoshbakhti & Mirmasoumi, S. & Bahlouli, K., 2019. "Optimization strategies for mixing ratio of biogas and natural gas co-firing in a cogeneration of heat and power cycle," Energy, Elsevier, vol. 181(C), pages 635-644.
    5. Mancini, G. & Luciano, A. & Bolzonella, D. & Fatone, F. & Viotti, P. & Fino, D., 2021. "A water-waste-energy nexus approach to bridge the sustainability gap in landfill-based waste management regions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    6. Alkan, Mehmet Ali & Keçebaş, Ali & Yamankaradeniz, Nurettin, 2013. "Exergoeconomic analysis of a district heating system for geothermal energy using specific exergy cost method," Energy, Elsevier, vol. 60(C), pages 426-434.
    7. Güngör, Osman & Tozlu, Alperen & Arslantürk, Cihat & Özahi, Emrah, 2024. "District heating based on exhaust gas produced from end-of-life tires in Erzincan: Thermoeconomic analysis and optimization," Energy, Elsevier, vol. 294(C).
    8. Yan, Peng & Shi, Hong-Xin & Chen, You-Peng & Gao, Xu & Fang, Fang & Guo, Jin-Song, 2020. "Optimization of recovery and utilization pathway of chemical energy from wastewater pollutants by a net-zero energy wastewater treatment model," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).

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