• Sludge Solubilization using Microwave Irradiation in the Presence of Fe Powder
  • Yi, Min-Joo;Choi, Hyun-Kyung;Han, Ihn-Sup;
  • Department of Environmental Engineering, University of Seoul;Department of Environmental Engineering, University of Seoul;Department of Environmental Engineering, University of Seoul;
Abstract
In this study, microwave irradiation, which is reflected by metals, was used to reduce the amount of sewage sludge, and the results were used to verify solubilization efficiency and determine optimum operation conditions. Biogas production and methane content of the gas under optimized conditions were measured with the biochemical methane potential (BMP) test. The sludge was taken from a thickened sludge tank at J sewage treatment plant (JSTP) in Seoul, Korea. For the experiments, 50 mL of sludge was filled in vessels and the vessels were irradiated with the power of 500, 600, 700, and 800W for 2~5 min. In addition, Fe powder was added by 0.01, 0.05, and 0.1 g to compare the efficiency with and without Fe powder. The results confirmed that solubilization efficiency was higher in the presence of Fe powder. The optimum conditions of 0.01 g addition of Fe powder with 800W irradiation for 5 min, yielded nearly 22.95% higher solubilization efficiency than without Fe powder. The BMP tests were carried out using sludge obtained from the experiments carried out under the optimum conditions. As a result, sludge subjected by 800W with 0.01 g of Fe powder for 5 min displayed the highest level of gas production and methane content. Through this study, it could be confirmed that solubilization efficiency increased by addition of Fe powder.

Keywords: Sewage sludge;Microwave;Reduction;Anaerobic digestion;Solubilization;

References
  • 1. Bae, SJ., 2005, Estimation of Ultimate Yields from Municipal Solid Waste Components using BMP Test, Master thesis, University of Seoul, Seoul, Korea, p. 64.
  •  
  • 2. Cho, J.K. and Park, S.C., 1995, Biochemical methane potential and solid state anaerobic digestion of Korean food wastes, Bioresource Technology, 52(3), 245-253.
  •  
  • 3. Jeon, Y.W., Choi, H.N., Jeong, Y.J., and Hong, S.M., 2003, Pulse power pre-treatment of waste activated sludge for upgrading of anaerobic digestion efficiency, 2003 Korea Society of Environmental Engineers Spring Conference, Korea Society of Environmental Engineers, KAIST, Korea, p. 112-119.
  •  
  • 4. Jung, B.G., Jang, S.H., and Sung, N.C., 2007, Pretreatment characteristics and specific methanogenie activity of municipal sewage sludge by dual frequency sonication, Journal of the Environmental Sciences, 16(2), 211-218.
  •  
  • 5. Kim, D.J., 2004, A characteristics analyses of sludge reducing technology in wastewater treatment plants, Journal of the Korea Society of Water and Wastewater, 12(3), 85-92.
  •  
  • 6. Kim, H.Y., Lee, S.C., Han, D.W., and Kim, D.J., 2008, Effect of pre-treatment on the solubilization and anaerobic digestion rate of wastewater sludge, 2008 Korea Society of Environmental Engineers Spring Conference, Korea Society of Environmental Engineers, University of Ulsan, Korea, p. 1191-1197.
  •  
  • 7. Lee, E.K., 2008, Comparison of Ultrasound and Microwave Methods for Solubilization of Sewage Sludge, Master thesis, University of Seoul, Seoul, Korea, p. 68.
  •  
  • 8. Lee, I.K., Kim, S.J., Kwon, S.K., and Kim, H.O., 2008, Two-phase anaerobic co-digestion of food waste, swine slurry and wastewater sludge, 2008 Korea Society of Environmental Engineers Spring Conference, Korea Society of Environmental Engineers, University of Ulsan, Korea, p. 461-465.
  •  
  • 9. Ministry of Commerce, Industry and Energy, 2006, The Study of Biogas Production and Energy Use by High-rate Two Phase Anaerobic Treatment of Swine Wastewater, Korea, p. 161.
  •  
  • 10. Ministry of Environment., 2007, Development of Pre-treatment and Reduction Technology of Sludge using Microwave, Ministry of Environment, Korea, p. 381.
  •  
  • 11. Ministry of Environment., 2009, Statistic of Sewerage, Ministry of Environment, Korea, p. 1140.
  •  
  • 12. Muller, J.A., 2001, Prospects and problems of sludge pre-treatment process, Proceedings of the IWA Specialist Conference of Sludge Management, Taipei, Taiwan, p. 111-118.
  •  
  • 13. Shin, Y.H., Hong, S.M., Lee, E.S., and Lee, Y.S., 2007, A Study of condition for effective reduction of sludge using microwave and hot air, 2007 Korea Society of Environmental Engineers Fall Conference, Korea Society of Environmental Engineers, Kangwon National University, Korea, p. 401-405.
  •  
  • 14. Tiehm, A., Nickel, K., Zellhorn, M., and Neis, U., 2001, Ultrasonic waste activated sludge disintergrateion for improving anaerobic stabilization, Water Research. 35(8), 2003-2009.
  •  
  • 15. Yoon, S.J., 2003, A Study on the Minimization of Sludge Generation and Sludge Solubilization using Ultrasonic Treatment in Biological Sewage Treatment Process, Doctoral thesis, Keimyung University, Korea, p. 97.
  •  
  • 16. Yoon, Y.S., 2007, Solubilization Characteristics of Municipal Wastewater Sludge by Ultrasound and Thermal Treatment, Master thesis, Hallym University, Korea, p. 88.
  •  

This Article

  • 2010; 15(2): 40-46

    Published on Apr 30, 2010

  • Received on Mar 5, 2010
  • Revised on Mar 13, 2010
  • Accepted on Apr 22, 2010