Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Micro-Bubble Generating Properties on Gas/Liquid Flow Rate Ratio with the Sludge Flotation/Thickening Apparatus

슬러지 부상농축장치의 기·액 유량비에 따른 미세기포 발생 특성

  • Lee, Chang-Han (Department of Environmental Administration, Catholic University of Pusan) ;
  • Park, Jong-Won (ILSOM Co., Ltd. R&D CENTER) ;
  • Ahn, Kab-Hwan (Department of Environmental Administration, Catholic University of Pusan)
  • 이창한 (부산가톨릭대학교 환경행정학과) ;
  • 박종원 (일솜주식회사) ;
  • 안갑환 (부산가톨릭대학교 환경행정학과)
  • Received : 2013.07.18
  • Accepted : 2013.09.10
  • Published : 2014.01.31
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Abstract

The sludge flotation/thickening apparatus equipped a micro-bubble generating pump was used to investigate micro-bubble generating properties on operational parameters. We evaluated micro-bubble generating properties as results to be operated the apparatus by operational parameters which are pump discharge pressure, air/water ratio(A/W ratio), air flow rate, and water flow rate. Micro-bubble generating efficiencies in pumps without recycling flow and with 50% of recycling flow was found to be very efficient on optimum A/W ratio from 1.06 to 3.62% and optimum A/W ratio from 1.05 to 4.06%, respectively. In condition of 3.6% of A/W ratio, we showed that the apparatus could be generated 36,000 ppm of micro-bubble concentration to be optimum treatment efficiency in sludge thickening process.

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References

  1. Bratby, J. R., Ambrose, W. A., 1995, Design and control of flotation thickeners, Wat. Sci. Tech., 31(3-4), 247-261.
  2. Choi, Y. G., Chung, T. H., 2000, Effects of humus soil on the settling and dewatering characteristics of activated sludge, Wat. Sci. Tech. 42(9), 127-134.
  3. Cleverson, V. A., Marcos S., Fernando F., 2007, Sludge Treatment and Disposal, IWA Publishing, 78-81.
  4. Edzwald, J. K., 2010, Dissolved Air Flotation and Me, Wat. Res., 44(7), 2077-2106. https://doi.org/10.1016/j.watres.2009.12.040
  5. Kwak, D. H., Kim, S. J., Lim, Y. H., Flotation Separation of Biological Floc Using the Dissolved Air Flotation Process, J. of the Korean Society of Water and Wastewater, 18(5), 649-655.
  6. Kim, K. S., 2007, The Present State and Improvement of Sludge Disposal from Sewage Treatment Plants, 29(1), 8-16.
  7. Park, S. C., Han, M. Y., Dockko, S., Kwon, S. B., 2006, Thickening of Sludge from DAF process by Flotation Application of Solid Flux Theory and Effective Factors, J. of the Korean Society of Water and Wastewater, 20(4), 617-626.
  8. Rubio, J., Souza, M. L., Smith, R. W., 2002, Overview of flotation as a wastewater treatment technique, Miner. Eng., 15(3), 139-155. https://doi.org/10.1016/S0892-6875(01)00216-3
  9. Ministry of Environment, 2004, Improvement of Drinking-Water Treatment Plant and Advanced Water Treatment Technology, 63-65.
  10. Lee, C. H., An, D. M., Kim, S. S., Cho, S. H., Ahn, K. H., 2009a, Pretreatment Condition in the Full Scale Dissolved Air Flotation Process, KSEE, 31(1), 58-63.
  11. Lee, C. H., Ahn, K. H., 2009b, Effect of Chemical Conditioning on Flotation and Thicken Properties of Sludge using a Microbubble generating Pump, KSEE, 31(8), 641-648.
  12. An, D. M., Lee, C. H., Choi, Y. C., Cho, S. H., Ahn, K. H., Kim, S. S., 2002, Bubble Concentration and Flotation Efficiency in Domestic DAF Pump, Theories and Applications of Chemical Engineering, 8(1), 1553-1556.