전기장 및 초음파에 의한 반송슬러지의 가용화에 따른 활성슬러지에서의 슬러지 감량화

Sludge Reduction in Activated Sludge Process by solubilizing Return Sludge using Electric Field/Ultrasonification

  • 윤순욱 (인하대학교 환경공학과) ;
  • 안창민 (인하대학교 환경공학과) ;
  • 김창균 (인하대학교 환경공학과)
  • Yoon, Soon-Uk (Department of Environmental Engineering, Inha University) ;
  • Ahn, Chang-Min (Department of Environmental Engineering, Inha University) ;
  • Kim, Chang-Gyun (Department of Environmental Engineering, Inha University)
  • 발행 : 2013.05.30

초록

This study was conducted to reduce excess sludge generation by recycling of return sludge to the aeration tank after solubilization by electric field charger and ultrasonifier. The return sludge was purposely broken-up to the ratio of $SCOD_{Cr}/TCOD_{Cr}$ at 0.1, 0.2, and 0.3, which was tested along with control (i.e., untreated). Solubilized sludge was subsequently treated in a bench-scaled conventional activated sludge reactor. According to varying $SCOD_{Cr}/TCOD_{Cr}$ ratios, TSS in the reactor was correspondingly increased from 129 to 219 mg/L and $TCOD_{Cr}$ was also from 257 to 335 mg/L. However, TSS in the effluent was nevertheless kept lower at below 30 mg/L and $TCOD_{Cr}$ was also unvaryingly below 40 mg/L. For $SCOD_{Cr}/TCOD_{Cr}$ = 0.3, the amount of excess sludge produced was at the highest decreased up to as high as 78%.

키워드

참고문헌

  1. APHA. (1998). Standard Methods for the Examination of Water and Wastewater, (20th ed.), American Public Health Association, Washington, D.C., U.S.A.
  2. Brooks, R. B. (1970). Heat Treatment of Sewage Sludge, Water Pollution Control, 69(2) pp. 221-231.
  3. Canales, A. P. and Poles, J. L. (1994). Decreased Sludge Production Strategy for Domestic Wastewater Treatment, Water Science and Technology, 30(8), pp. 97-106.
  4. Chang, T. C., You, S. J., Damodar, R. A., and Chen, Y. Y. (2011). Ultrasound Pre-treatment Step for Performance Enhancement in an Aerobic Sludge Digestion Process, Journal of Taiwan Institute of Chemical Engineers, 42(5), pp. 801-808. https://doi.org/10.1016/j.jtice.2011.01.003
  5. Cheng, C. J., Hong, A., and Lin, C. F. (2012). Improved Solubilization of Activated Sludge by Ozonation in Pressure Cycles, Chemosphere, 87(6), pp. 637-643. https://doi.org/10.1016/j.chemosphere.2012.02.001
  6. Chiu, Y. C., Chang, C. N., Lin, J. G., and Huang, S. J. (1997). Alkaline and Ultrasonic Pretreatment of Sludge before Anaerobic Digestion, Water Science and Technology, 36(11), pp. 155-162.
  7. Choi, K. C., Kwon, O. O., Kim, Y. D.. Kim, Y. H., Lee, W. S., Lee, J. Y., Jeon, S. J., and Jeong, S. K. (2000). Standard Method for Wastewater, Dong-Hwa Tech., pp. 285-287, 298-300. [Korean Literature]
  8. Environmental Corporation of Incheon (ECI). (2012). Gajwa Sewage Treatment Plant Management Status. http://www.eco-i.or.kr/eco/department/gajwa_05.asp?mcode=03_03_05. [Korean Literature]
  9. Hu, K., Jiang, J. Q., Zhao, Q. L., Lee, D. J., Wang, K., and Qiu, W. (2011). Conditioning of Wastewater Sludge using Freezing and Thawing: Role of Curing, Water Research, 45(18), pp. 5969-5976. https://doi.org/10.1016/j.watres.2011.08.064
  10. Hulsheger, H., Potel, J., and Niemann, E. G. (1983). Electric Field Effects on Bacteria and Yeast Cells, Radiation and Environmental Biophysics, 22, pp. 149-162. https://doi.org/10.1007/BF01338893
  11. Hwang, S. J. (2004). The Status of Technique for Treatment and Recycling using Sewage Sludge : the Sludge Reduction Technique by Source Control, Journal of Korea Society of Waste Management, 2, pp. 7-17. [Korean Literature]
  12. International Maritime Organization (IMO). (2013). Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter, http://www.imo.org/about/conventions/listofconventions/pages/convention-on-the-prevention-of-marine-pollution-by-dumping-of-wastes-and-other-matter.aspx
  13. Khanal, S. K., Isik, H., Sung, S., and van Leeuwen, J. (2006). Effects of Ultrasound Pretreatment on Aerobic Digestibility of Thickened Waste Activated Sludge, In Proceedings of 7th Specialized Conference on Small Water and Wastewater Systems, Mexico City, Mexico.
  14. Khanal, S. K., Grewell, D., Sung, S., van Leeuwen, J. (2007). Ultrasound Applications in Wastewater Sludge Pretreatment: A Review, Critical Reviews in Environ. Science and Technology, 37, pp. 277-313.
  15. Kopp, J., Muller, J., Dichtl, N., and Schwedes, J. (1997). Anaerobic Digestion and Dewatering Characteristics of Mechanically Excess Sludge, Water Science and Technology, 36(11), pp. 129-136.
  16. Korea Electric Power Corporation (KEPCO). (2011). http://www.kepco.co.kr/. [Korean Literature]
  17. Laurent, J., Jaziri, K., Guignard, R., Casellas, M., and Dagot, C. (2011). Comprehensive Insight of the Performances of Excess Sludge Reduction by $90^{\circ}C$ Thermal Treatment Coupled with Activated Sludge at Pilot Scale: COD and N Removal, Bacterial Populations, Fate of Heavy Metals, Process Biochemistry, 46(9), pp. 1808-1816. https://doi.org/10.1016/j.procbio.2011.06.007
  18. Lee, J. W., Cha, H. Y., Park, K. Y., Song, K. G., and Ahn, K. H. (2005). Operational Strategies for an Activated Sludge Process in Conjunction with Ozone Oxidation for Zero Excess Sludge Production during Winter Season, Water Research, 39(7), pp. 1199-1204. https://doi.org/10.1016/j.watres.2004.10.004
  19. Liu, X., Liu, H., Chen, J., Du, G., and Chen, J. (2008). Enhancement of Solubilization and Acidification of Waste Activated Sludge by Pretreatment, Waste Management, 28(12), pp. 2614-2622. https://doi.org/10.1016/j.wasman.2008.02.001
  20. McCarty, P. L. and Rittmann, B. E. (2000), Environmental Biotechnology: Principles and Applications, McGraw-Hill, pp. 507-525.
  21. Metcalf and Eddy (1991). Wastewater Engineering (3rd ed.), McGraw-Hill, New York, pp. 393-395.
  22. Ministry of Environment (MOE). (2008). Total Plan for Sewage Sludge Treatment, Ministry of Environment, pp. 3-4 [Korean Literature]
  23. Neyens, E., Baeyens, J., Creemers, C. (2003). Alkaline Thermal Sludge Hydrolysis, Journal of Hazardous Materials, B97, pp. 295-314.
  24. Penaud, V., Delgenès, J. P., and Moletta, R. (1999). Thermochemical Pretreatment of a Microbial Biomass: Influence of Sodium Hydroxide Addition on Solubilization and Anaerobic Biodegradability, Enzyme and Microbial Technology, 25(3-5), pp. 258-263. https://doi.org/10.1016/S0141-0229(99)00037-X
  25. Seo, J. W., Han, J. S., Ahn, C. M., Min, D. H., Yoo, Y. S., Yoon, S. U., Lee, J. K., Lee, J. Y., and Kim, C. G. (2011). Study on Characteristics of Solubilization for Sewage Sludge Using Electronic Field and Ultrasonification, Journal of Korean Society Environmental Engineering, 33(9), pp. 636-643. [Korean Literature] https://doi.org/10.4491/KSEE.2011.33.9.636
  26. Vlyssides, A. G. and Karlis, P. K. (2004). Thermal-alkaline Solubilization of Waste Activated Sludge as a Pre-treatment Stage for Anaerobic Digestion, Bioresource Technology, 91(2), pp. 201-206. https://doi.org/10.1016/S0960-8524(03)00176-7
  27. Wang, F., Shan, L., and Ji, M. (2006). Components of Released Liquid from Ultrasonic Waste Activated Sludge Disintegration, Ultrasonics Sonochemistry, 13(4), pp. 334-338. https://doi.org/10.1016/j.ultsonch.2005.04.008
  28. Xie, B., Wang, L., and Liu, H. (2008). Using Low Intensity Ultrasound to Improve the Efficiency of Biological Phosphorus Removal, Ultrasonics Sonochemistry, 15(5), pp. 775-781. https://doi.org/10.1016/j.ultsonch.2008.02.001
  29. Xu, G., Chen, S., Shi, J., Wang, S., and Zhu, G. (2010). Combination Treatment of Ultrasound and Ozone for Improving Solubilization and Anaerobic Biodegradability of Waste Activated Sludge, Journal of Hazardous Materials, 180(1-3), pp. 340-346. https://doi.org/10.1016/j.jhazmat.2010.04.036
  30. Yasui, H., Nakamura, K., Sakuma, S., Iwasaki, M., and Sakai, Y. A. (1996). Full-scale Operation of a Novel Activated Sludge Process Without Excess Sludge Production, Water Science and Technology, 34(3-4), pp. 395-404. https://doi.org/10.1016/0273-1223(96)00604-X
  31. Yasui, H. and Shibata, M. (1994). An Innovative Approach to Reduce Excess Sludge Production in the Activated Sludge Process, Water Science and Technology, 30(9), pp. 11-20.
  32. Yoon, S. H., Kim, H. S., Hwang, S. J. (2001). Zero Sludge Discharge Using MBR - Ultrasound System, Journal of Korean Society Environmental Engineering, 23(9), pp. 1423-1429. [Korean Literature]
  33. Yoon, S. H., Kim, H. S., and Lee, S. (2004). Incorporation of Ultrasonic cell Disintegration into a Membrane Bioreactor for Zero Sludge Production, Process Biochemistry, 39(12), pp. 1923-1929. https://doi.org/10.1016/j.procbio.2003.09.023
  34. Yoon, Y. S. (2003). Enhancement Effect of Ultrasonically Treated Waste Sludge in Advanced Wastewater Treatment, Journal of Industrial Engineering Chemistry, 14(7), pp. 953-958. [Korean Literature]