Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
권호 표지

Operation and Diagnosis of DAF Water Treatment Plant at Highly Turbid Raw Water

고탁도시 DAF 정수장의 운영 및 진단

  • 권순범 (한국수자원공사 국제상하수도연구소) ;
  • 안효원 (한국수자원공사 국제상하수도연구소) ;
  • 강준구 (한국수자원공사 국제상하수도연구소) ;
  • 손병용 (한국수자원공사 횡성권건설단)
  • Received : 2003.09.12
  • Accepted : 2004.02.02
  • Published : 2004.04.15
Download PDF
⟨ Previous Next ⟩

Abstract

DAF process has been designed considering raw water quality characteristics in Korea. Although direct filtration is usually operated, DAF is operated when the freshwater blooms occut or raw water turbidity become high. Pre-sedimentation iS prepared in case when raw water turbidity is very high by rainstorms. A main feature of this plant is that the operation mode can be changed (controlled) based on the characteristics of raw water to optimize the effluent quality and the operation costs. Treatment capacity (surface loading rate) and efficiency of DAF was found to be better than conventional sedimentation process. Moreover, low-density particles (algae and alum flocs) are easily separated while it is difficult to remove in sedimentation. One of the main concerns in adoption of DAF (Dissolved Air-Flotation) process is a high raw water turbidity problem. That is, DAF is not adequate for raw water, which is more turbid than 100NTU. In order to avoid this problem, pre-sedimentation basins are prepared in DAF plant to decrease the turbidity of DAF influent. For simulation of the actual operation, bench and full-scale tests were performed for highly turbid water conditions. Consequently, DAF process coupled with sedimentation is suggested that pre-sedimentation with optimum coagulation prior to DAF would be appropriate.

Keywords

References

  1. 신흥식 (2002) DAF 도입배경 및 System 구성，상하수도학회지 , 16(4), pp.373-380
  2. 이선주，권순범(2002) 호소수를 이용한 용존공기부상법(DAF)의 효율에 관한 연구, 상하수도학회지, 16(3), pp. 341-349
  3. 한국수자원공사(1998) 운주권 광역상수도사업 실시설계보고서. 한국수자원공사, pp.82-187
  4. American Water Works Association Research Foundation. (1998) Treatment Proms Selection for Particle Removal, American Water Works Association, Denver, USA, pp.83m
  5. Amato, T., Edzwald, J.K., Tobiason, J.E., Dahlquist, J., and Hedberg, T. (2001) Anintegrated approach to dissolved air flotation, Wat. Sci. Tecb., 43(8), pp.19-26
  6. Edzwald, J.K. (1995) Principles and applications of dissolved-airflotation, Wat. Sci, Tecb., 31(3-4), pp. 1-23
  7. Edzwald, J.K., Walsh,J.P., Kaminski, G.S, and Dunn, H.J. (1992) Flocculation and Air Requirements for Dissolved Air Flotation, Jour. of theAmerican Water Works Association, 84(3),pp.92-100
  8. Janssen, J.G. and Buekens, A. (1993) Assesment of Process Selection for Particle Removal in the Surface Water Treatment, Aqua, 21(5), pp.279-288
  9. J., Haarhoff, L.R.J, van Vuuren, (1995) Design Parameters for Dissolved Air Flotation in South Africa, Wat. Sci. Tecb., 31(3-4), pp.203-212
  10. Kawamura S. (2000) Integrated Design and Operatiun of Water Treatment Facilities. 2nd Ed. john Wiley & Sons Inc, USA, pp.189-194
  11. Valade, M.T., Edzwald, J.K., Tobiason,J.E., Dahlquist, J., Hedberg, T., and Amalp, T. (1996) Pretreatment Effects on Panicle Removal by Flocation and Filtration and filtration, Jour. of the American Water Warks Association, 88(12), pp. 35-47