Techno-Economic Analysis of Fluidized Bed Combustion of a Mixed Fuel from Sewage and Paper Mill Sludge

Milan Carsky, Olga Solcova (), Karel Soukup, Tomas Kralik, Kamila Vavrova, Lukas Janota, Miroslav Vitek, Stanislav Honus, Marek Jadlovec and Lenka Wimmerova
Additional contact information
Milan Carsky: Institute of Chemical Process Fundamentals of the CAS, 165 00 Praha, Czech Republic
Olga Solcova: Institute of Chemical Process Fundamentals of the CAS, 165 00 Praha, Czech Republic
Karel Soukup: Institute of Chemical Process Fundamentals of the CAS, 165 00 Praha, Czech Republic
Tomas Kralik: Faculty of Electrical Engineering, CTU Prague, 166 27 Prague, Czech Republic
Kamila Vavrova: Silva Taroucy Research Institute for Landscape and Ornamental Gardening, 252 43 Průhonice, Czech Republic
Lukas Janota: Faculty of Electrical Engineering, CTU Prague, 166 27 Prague, Czech Republic
Miroslav Vitek: Faculty of Electrical Engineering, CTU Prague, 166 27 Prague, Czech Republic
Stanislav Honus: Faculty of Mechanical Engineering, Department of Energy, VSB-Technical University of Ostrava, 708 33 Ostrava, Czech Republic
Marek Jadlovec: Faculty of Mechanical Engineering, Department of Energy, VSB-Technical University of Ostrava, 708 33 Ostrava, Czech Republic
Lenka Wimmerova: Faculty of Environmental Sciences, Czech University of Life Sciences Prague, 165 00 Prague, Czech Republic

Energies, 2022, vol. 15, issue 23, 1-13

Abstract: The treatment and disposal of sewage sludge is one of the most important and critical issues of wastewater treatment plants. One option for sludge liquidation is the production of fuel in the form of pellets from mixed sewage and paper mill sludge. This study presents the results of the combustion of pelletized fuels, namely sewage and paper mill sludge, and their 2:1 and 4:1 blends in a fluidized bed combustor. The flue gas was analysed after reaching a steady state at bed temperatures of 700–800 °C. Commonly used flue gas cleaning is still necessary, especially for SO 2 ; therefore, it is worth mentioning that the addition of paper mill sludge reduced the mercury concentration in the flue gas to limits acceptable in most EU countries. The analysis of ash after combustion showed that magnesium, potassium, calcium, chromium, copper, zinc, arsenic, and lead remained mostly in the ash after combustion, while all cadmium from all fuels used was transferred into the flue gas together with a substantial part of chlorine and mercury. The pellets containing both sewage and paper mill sludge can be used as an environmentally friendly alternative fuel for fluidised bed combustion. The levelized cost of this alternative fuel is at the same current price level as lignite.

Keywords: pelletizing; sewage sludge; paper mill sludge; combustion; fluidized bed; environmental assessment; economic evaluation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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