Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Flotation Characteristics of Activated Sludge by Micro-bubbles

미세 기포에 의한 활성슬러지의 부상특성

  • 김성진 (여수한영대학 보건환경학과) ;
  • 강병준 (서남대학교 환경화학공학부) ;
  • 박상욱 (서남대학교 환경화학공학부) ;
  • 이재욱 (서남대학교 환경화학공학부) ;
  • 정흥조 (서남대학교 환경화학공학부) ;
  • 곽동희 (서남대학교 환경화학공학부)
  • Received : 2005.10.26
  • Accepted : 2006.08.12
  • Published : 2006.08.15
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Abstract

Dissolved air flotation (DAF) has been well known for the gravity separation process. The solids to be separated are transferred from the water body to the water surface using micro-air bubbles. DAF has also been used for enhancing solids-liquid separation of industrial and municipal wastewater by adding a its unit parallel to a sedimentation unit to reduce the hydraulic loading in the sedimentation clarifier. This study was to investigate flotation characteristics of activated sludge by the recent DAF technique without chemical agents. In addition, the effect on temperature in flotation of activated sludge and the thickening degree of activated sludge were studied.

Keywords

References

  1. Bennoit, H., Peter-Frohlich, A., Schmidt, V. and Schuster, C. (1994). Biological treatment of municipal wastewater in Berlin, using a 10 m deep basin and flotation for secondary clarification. Wat. Sci. Tech., 30(4) 81-88.
  2. Bennoit, H., Muller, G. and Schuster, C. (1997). Upherading of waste treatmant plants with flotation. Preprints of IA WQ Conference Upgrading of Waste Water Treatment Systems, Kalmar, Swedenn, May 25-28, 1997. 8p.
  3. Dong-Heui Kwak, Seok-Dockko, (2003) Effect of controlling the of microbubble in DAF. Proceeding of 2nd International Workshop on Flotation, B-5, 157-167.
  4. Gnirss, R. and Peter-Frohlich, A. (1996). Biological treatment of municipal wastewater with deep tanks and flotation for secondary clarification. Wat Sci. Tech., 34(3-4), 257-265.
  5. Kwak, D.-H., Jung, H.-J., Kim, S.-J., Won, C.-H., Lee, J.- W. (2005) Separation Characteristics of Inorganic Paricles from Rainfalls in Dissolved Air Flotation: A Korean Perspective. Separation Science and Technology, 40, pp. 3001-3016. https://doi.org/10.1080/01496390500338144
  6. Jung, H.-J., Choi, D.-Y., Kim, S.-J., Lee, J.-W., and Kwak, D.-H. (2006) Removal Efficiency of Activated Sludge Flocs in Dissoived Air Flotation Using Population Balance Model. Korean Journal of Chemical Engineering, 23(2), pp. 271- 278. https://doi.org/10.1007/BF02705726
  7. Lee, Sang-hun. Han, Mooyoung. (2002) The Effect of Bubble Berd Depth on Removal Efficiency in DAF Process. Proceeding of International Workshop on Flotation in Water and Wastewater Treatment.
  8. Mudllbarger, M and Huffman, D. (1970). Mixed liquor solids separation by flotation. Journal of hthe sanitary Engineering Division, Proceedings of the American Society of Civil Engineers, 96(SA 4), 861-871.
  9. Severeid, D.E. (1979). Development of an improved secondary treatment process. Tappi J., 62(2), 61-63.
  10. U.S.A. EPA (1979) U.S. Environmental Protection Agency, Process Design Manual for Sludge Treatment and Disposal, Washington, D.C.
  11. Viitasaari, M., Jokela, P. and Heinanen J. (1995). Dissolved air flotation in the treament of industrial wastewaters with a special emphasis on forest and foodstuff industries. Wat. sci. Tech., 31(3-4) 299-313.
  12. WPCF (1980). Sludge thickening. Manual of practice No.FD-1.Water Polluntion Control Federation, Washington, D.C.