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Energies 2018, 11(4), 748; https://doi.org/10.3390/en11040748

Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge

1
Department of Environmental Engineering, Opole University of Technology, 45-758 Opole, Poland
2
West Technology &Trading Polska Sp. z o.o., 45-641 Opole, Poland
3
Department of Boilers, Burners and Energy Systems, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
*
Author to whom correspondence should be addressed.
Received: 16 February 2018 / Revised: 19 March 2018 / Accepted: 22 March 2018 / Published: 26 March 2018
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Abstract

This study proposes an innovative installation concept for the sustainable utilization of sewage sludge. The aim of the study is to prove that existing devices and technologies allow construction of such an installation by integration of a dryer, torrefaction reactor and gasifier with engine, thus maximizing recovery of the waste heat by the installation. This study also presents the results of drying tests, performed at a commercial scale paddle dryer as well as detailed analysis of the torrefaction process of dried sewage sludge. Both tests aim to identify potential problems that could occur during the operation. The scarce literature studies published so far on the torrefaction of sewage sludge presents results from batch reactors, thus giving very limited data of the composition of the torgas. This study aims to cover that gap by presenting results from the torrefaction of sewage sludge in a continuously working, laboratory scale, isothermal rotary reactor. The study confirmed the feasibility of a self-sustaining installation of thermal utilization of sewage sludge using low quality heat. Performed study pointed out the most favorable way to use limited amounts of high temperature heat. Plasma gasification of the torrefied sewage sludge has been identified that requires further studies. View Full-Text
Keywords: sewage sludge; torrefaction; gasification; drying; sustainability sewage sludge; torrefaction; gasification; drying; sustainability
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Tic, W.J.; Guziałowska-Tic, J.; Pawlak-Kruczek, H.; Woźnikowski, E.; Zadorożny, A.; Niedźwiecki, Ł.; Wnukowski, M.; Krochmalny, K.; Czerep, M.; Ostrycharczyk, M.; Baranowski, M.; Zgóra, J.; Kowal, M. Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge. Energies 2018, 11, 748.

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