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Enhanced Pollution Removal with Heat Reclamation in a Small Hungarian Wastewater Treatment Plant

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 6, Issue 3, September 2018, pp 494-504
DOI: https://doi.org/10.13044/j.sdewes.d6.0200
Viola Somogyi , Viktor Sebestyén, Zsófia Kovács, Réka H. Hargitai, Endre Domokos
Institute of Environmental Engineering, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary


The aim of the research is to outline the possibilities of utilizing waste heat in small municipal wastewater treatment plants. The facility, which was chosen as case-study, accepts about 2,300 m3 of raw sewage daily. In wintertime the wastewater temperature decreases to 10-14 °C which results in lower nitrification capacity based on measurement and validated model results. The excess heat of the wastewater would serve to increase the temperature of the aeration tank in order to enhance the microbiological activity and thus the efficiency of pollutant removal. The amount of reusable waste heat is calculated and with the help of dynamic simulation the effluent quality was determined to compare it with the original results. Increasing the temperature by 6 °C in the aerated tank, ammonium removal could be improved by 61%. This way not only the heat, but the nutrient pollution could be mitigated, too.

Keywords: Waste heat recovery, Wastewater treatment, Activated sludge model, Dynamic simulation, Nitrogen removal.

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