[01] Emilian-Narcis Riti-Mihoc, Faculty of Materials and Environmental Engineering, Department Environmental Engineering and Sustainable Development Entrepreneurship, Technical University of Cluj-Napoca, Cluj-Napoca, Romania. [02] Emil Riti-Mihoc, Faculty of Materials and Environmental Engineering, Department Environmental Engineering and Sustainable Development Entrepreneurship, Technical University of Cluj-Napoca, Cluj-Napoca, Romania. [03] Dan Porcar, Faculty of Materials and Environmental Engineering, Department Environmental Engineering and Sustainable Development Entrepreneurship, Technical University of Cluj-Napoca, Cluj-Napoca, Romania.

This paper presents new experimental results regarding energy efficiency of the treatment in microwave field of the sludge from wastewater treatment plants. Research was based on comparing by drying in heat convection and drying by heating in the microwave field. Are presented the results of experiments, and the phenomena occurring in the two types of drying analyzed. The final results highlights the energy efficiency of drying in microwave field compared to convective drying.

Sewage Sludge, Wastewater, Microwave Treatment, Energetic Efficiency, Drying Sludge

[01] Dan, V., Riti-Mihoc, E., Riti-Mihoc, E. N. - Thermal treatment of clearing sludge in microwave field, 4th Research / Expert Conference with International Participations "QUALITY" 2005 Fojnica, B & H, 2005. [02] Dan V. - Contributions to study the process of heating and drying the molds using microwave energy PhD Thesis - Technical University of Cluj-Napoca, 2000. [03] Dolande, J., Dana, A. - Temperature profiles in microwave heating of solids: a systematic study. Journal of Microwave Power and Electromagnetic Energy, Vol. 28, No. 2, p. 58-67, 2003. [04] Gan, Q. - A case study of microwave processing of metal hydroxide sediment sludge from printed circuit board manufacturing wash water. Waste Management; 20:695–701, 2000. [05] Liao, P. H., Wong, W. T. and Lo, K. V. - Release of phosphorus from sewage sludge using microwave technology, Natural Sciences and Engineering Research Council of Canada, 2005. [06] Riti-Mihoc E. N., Riti-Mihoc, E., Porcar, D. - Mathematic Physical model of dimensioning system in the propagation of microwave "waveguide-sludge from wastewater treatment plants, 1st Annual International Interdisciplinary Conference AIIC 2013 24-26 April, Azores, Portugal Proceedings, European Scientific Journal, Special Issue, No. 3 June, 2013. ISSN: 1857-7881 (Print) ISSN: 1857-7431 (Online), pp. 82-90. [07] Riti-Mihoc E. N., Riti-Mihoc, E., Porcar, D. – Research on Microwave Calcinations of Sewage Sludge, Metalurgia International, Special Issue No. 5, 2013, ISSN 1582-2214, pg. 139-142. [08] Riti-Mihoc, E. N. - Studies and research on microwave field thermal processing sludge from sewage - PhD Thesis, Technical University of Cluj-Napoca, 2011. [09] Riti-Mihoc, E. N., Riti-Mihoc, E., Fodor, M. - Experimental research on treatment of sludge settling in microwave field, VII National Conference "Professor Dorin Pavel - Romanian hydropower founder" Sebes 2007. [10] Riti-Mihoc, E. N., Riti-Mihoc, E., Dan, V. - Stand for analyzing gas emissions from thermal processing in microwave field sludge settling, IX National Conference "Professor Dorin Pavel - founder of Romanian hydropower "Sebes, 2009. [11] http://ec.europa.eu/environment/archives/waste/sludge/pdf/part_ii_report.pdf