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Assessment of wastewater heat potential for district heating in Hungary

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  • Somogyi, Viola
  • Sebestyén, Viktor
  • Domokos, Endre

Abstract

The wastewater entering the treatment facility has a significant energy content providing sufficient circumstances for the biological processes, but it passes through the system without further utilization and it is released in the receiving water body causing heat pollution. If recovered, the heat could be used for several purposes; this paper addresses the options for using the wastewater excess heat in district heating systems in Hungary. Geographic information system tools were used to determine the distance between heat sources and areas with district heating to show where the excess heat could be used. Five scenarios were created as a function of distance in which the reclaimed heat would be transported to an already existing district heating station. Considering a temperature drop of 2 K, calculation showed that installing the system under 14,000 population equivalents would not be possible. In the other 79 cases, the major factors of return were the distances from the district heating station and the expenditures of the heat pump and pipelines. Under the chosen circumstances only a fraction of the investments (40% for the best scenario) showed return in less than 10 years. In only 12 cases would the payback period be below 5 years. The situation may be improved by increasing the amount of reclaimed heat (68 under 10 years and 22 in 5 years for the same scenario) or case of higher natural gas prices.

Suggested Citation

  • Somogyi, Viola & Sebestyén, Viktor & Domokos, Endre, 2018. "Assessment of wastewater heat potential for district heating in Hungary," Energy, Elsevier, vol. 163(C), pages 712-721.
    • Handle: RePEc:eee:energy:v:163:y:2018:i:c:p:712-721
    DOI: 10.1016/j.energy.2018.07.157
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    5. Steffen Nielsen & Kenneth Hansen & Rasmus Lund & Diana Moreno, 2020. "Unconventional Excess Heat Sources for District Heating in a National Energy System Context," Energies, MDPI, vol. 13(19), pages 1-18, September.
    6. Ziemele, Jelena & Volkova, Anna & Latõšov, Eduard & Murauskaitė, Lina & Džiuvė, Vytautas, 2023. "Comparative assessment of heat recovery from treated wastewater in the district heating systems of the three capitals of the Baltic countries," Energy, Elsevier, vol. 280(C).
    7. Guzović, Zvonimir & Duic, Neven & Piacentino, Antonio & Markovska, Natasa & Mathiesen, Brian Vad & Lund, Henrik, 2022. "Recent advances in methods, policies and technologies at sustainable energy systems development," Energy, Elsevier, vol. 245(C).
    8. Tomasz Łokietek & Wojciech Tuchowski & Dorota Leciej-Pirczewska & Anna Głowacka, 2022. "Heat Recovery from a Wastewater Treatment Process—Case Study," Energies, MDPI, vol. 16(1), pages 1-15, December.
    9. Guelpa, E. & Capone, M. & Sciacovelli, A. & Vasset, N. & Baviere, R. & Verda, V., 2023. "Reduction of supply temperature in existing district heating: A review of strategies and implementations," Energy, Elsevier, vol. 262(PB).

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