Progress In Electromagnetics Research B
ISSN: 1937-6472
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By M. S. Ferdous, E. H. Koupaie, C. Eskicioglu, and T. Johnson

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This paper describes the design of an experimental radio frequency (RF) heating system for efficiently heating waste activated sludge (WAS), a byproduct of wastewater treatment plants. Thermal pretreatment is used to increase the bio-gas yield from subsequent anaerobic processes which use WAS. The RF heating system operates at a frequency of 13.56 MHz and the frequency was selected based on a study of the electrical properties of WAS. RF heating has advantages over microwave heating including access to very efficient RF generators, and RF applicators can be designed to provide uniform heating through large load volumes, overcoming limitations of microwave heating which has a shallow penetration depth in the load. Experimental results for the RF heating system show a dc to RF power conversion efficiency of 85% and a power transfer efficiency from the amplifier to load of more than 86% over a temperature range from 20˚C to 120˚C.

M. S. Ferdous, E. H. Koupaie, C. Eskicioglu, and T. Johnson, "An Experimental 13.56 MHz Radio Frequency Heating System for Efficient Thermal Pretreatment of Wastewater Sludge," Progress In Electromagnetics Research B, Vol. 79, 83-101, 2017.

1. Braber, K., "Anaerobic digestion of municipal solid waste: A modern waste disposal option on the verge of breakthrough," Biomass and Bioenergy, Vol. 9, No. 1, 365-376, 1995.

2. Cakir, F. and M. Stenstrom, "Greenhouse gas production: A comparison between aerobic and anaerobic wastewater treatment technology," Water Research, Vol. 39, No. 17, 4197-4203, 2005.

3. Appels, L., J. Baeyens, J. Degrve, and R. Dewil, "Principles and potential of the anaerobic digestion of waste-activated sludge," Progress in Energy and Combustion Science, Vol. 34, No. 6, 755-781, 2008.

4. Vlyssides, A. and P. Karlis, "Thermal-alkaline solubilization of waste activated sludge as a pretreatment stage for anaerobic digestion," Bioresource Technology, Vol. 91, No. 2, 201-206, 2004.

5. Carballa, M., F. Omil, J. M. Lema, M. Llompart, C. Garcıa-Jares, I. Rodrıguez, M. Gomez, and T. Ternes, "Behavior of pharmaceuticals, cosmetics and hormones in a sewage treatment plant," Water Research, Vol. 38, No. 12, 2918-2926, 2004.

6. Oller, I., S. Malato, and J. Sanchez-Perez, "Combination of advanced oxidation processes and biological treatments for wastewater decontaminationa review," Science of the Total Environment, Vol. 409, No. 20, 4141-4166, 2011.

7. Wei, Y., R. T. V. Houten, A. R. Borger, D. H. Eikelboom, and Y. Fan, "Minimization of excess sludge production for biological wastewater treatment," Water Research, Vol. 37, No. 18, 4453-4467, 2003.

8. Bougrier, C., C. Albasi, J.-P. Delgenes, and H. Carrere, "Effect of ultrasonic, thermal and ozone pre-treatments on waste activated sludge solubilisation and anaerobic biodegradability," Chemical Engineering and Processing: Process Intensification, Vol. 45, No. 8, 711-718, 2006.

9. Nah, I. W., Y. W. Kang, K.-Y. Hwang, and W.-K. Song, "Mechanical pretreatment of waste activated sludge for anaerobic digestion process," Water Research, Vol. 34, No. 8, 2362-2368, 2000.

10. Neyens, E. and J. Baeyens, "A review of thermal sludge pre-treatment processes to improve dewaterability," Journal of Hazardous Materials, Vol. 98, No. 1, 51-67, 2003.

11. Eskicioglu, C., K. Kennedy, and R. Droste, "Enhanced disinfection and methane production from sewage sludge by microwave irradiation," Desalination, Vol. 248, No. 1, 279-285, 2009.

12. Koupaie, E. H. and C. Eskicioglu, "Below and above boiling point comparison of microwave irradiation and conductive heating for municipal sludge digestion under identical heating/cooling profiles," Bioresource Technology, Vol. 187, 235-245, 2015.

13. Saha, M., C. Eskicioglu, and J. Marin, "Microwave, ultrasonic and chemo-mechanical pretreatments for enhancing methane potential of pulp mill wastewater treatment sludge," Bioresource Technology, Vol. 102, No. 17, 7815-7826, 2011.

14. Choi, H., S.-W. Jeong, and Y.-J. Chung, "Enhanced anaerobic gas production of waste activated sludge pretreated by pulse power technique," Bioresource Technology, Vol. 97, No. 2, 198-203, 2006.

15. Lee, I.-S., P. Parameswaran, J. M. Alder, and B. E. Rittmann, "Feasibility of focused-pulsed treated waste activated sludge as a supplemental electron donor for denitrification," Water Environment Research, Vol. 82, No. 12, 2316-2324, 2010.

16. Salerno, M. B., H.-S. Lee, P. Parameswaran, and B. E. Rittmann, "Using a pulsed electric field as a pretreatment for improved biosolids digestion and methanogenesis," Water Environment Research, Vol. 81, No. 8, 831-839, 2009.

17. Park, W.-J., J.-H. Ahn, S. Hwang, and C.-K. Lee, "Effect of output power, target temperature, and solid concentration on the solubilization of waste activated sludge using microwave irradiation," Bioresource Technology, Vol. 101, No. 1, s13-s16, Jan. 2010.

18. Solyom, K., R. B. Mato, S. I. Perez-Elvira, and M. J. Cocero, "The in uence of the energy absorbed from microwave pretreatment on biogas production from secondary wastewater sludge," Bioresource Technology, Vol. 102, No. 23, 10 849-10 854, Dec. 2011.

19. Kuglarz, M., D. Karakashev, and I. Angelidaki, "Microwave and thermal pretreatments as methods for increasing the biogas potential of secondary sludge from municipal wastewater treatment plants," Bioresource Technology, Vol. 134, 290-297, 2013.

20. Mehdizadeh, S. N., C. Eskicioglu, J. Bobowski, and T. Johnson, "Conductive heating and microwave hydrolysis under identical heating profiles for advanced anaerobic digestion of municipal sludge," Water Research, Vol. 47, No. 14, 5040-5051, 2013.

21. Bennamoun, L., Z. Chen, and M. T. Afzal, "Microwave drying of wastewater sludge: Experimental and modeling study," Drying Technology, Vol. 34, No. 2, 235-243, 2016, [online], available: http://dx.doi.org/10.1080/07373937.2015.1040885.

22. Li, Z. Y., R. F. Wang, and T. Kudra, "Uniformity issue in microwave drying," Drying Technology, Vol. 29, No. 6, 652-660, 2011.

23. Haque, K. E., "Microwave energy for mineral treatment processes — A brief review," International Journal of Mineral Processing, Vol. 57, No. 1, 1-24, 1999.

24. Koupaie, E. H., T. Johnson, and C. Eskicioglu, "Advanced anaerobic digestion of municipal sludge using a novel and energy-efficient radio frequency pretreatment system," Water Research, Vol. 118, 70-81, 2017, [online], available: http://www.sciencedirect.com/science/article/pii/S0043135417302798.

25. Bobowski, J. S., T. Johnson, and C. Eskicioglu, "Permittivity of waste-activated sludge by an open-ended coaxial line," Progress In Electromagnetics Research Letters, Vol. 29, 139-149, 2012.

26. Bobowski, J. S. and T. Johnson, "Permittivity measurements of biological samples by an open-ended coaxial line," Progress In Electromagnetics Research B, Vol. 40, 159-183, 2012.

27. Stogryn, A., "Equations for calculating the dielectric constant of saline water (correspondence)," IEEE Trans. on Microwave Theory and Techniques, Vol. 19, No. 8, 733-736, 1971.

28., "Comsol multiphysics modeling software, version 4.3a,", COMSOL Inc..

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