상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제20권4호
  • /
  • Pages.617-626
  • /
  • 2006
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  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지

DAF 슬러지의 부상식 농축; 고형물 플럭스법 적용과 영향인자

Thickening of Sludge from DAF process by Flotation; Application of Solid Flux Theory and Effective Factors

  • 투고 : 2006.05.12
  • 심사 : 2006.08.10
  • 발행 : 2006.08.15
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초록

Compared with the sludge from gravity sedimentation, it is difficult for operations to settle the sludge occurred from dissolved-air-flotation (DAF). Even though there are some problems in treating DAF sludge with conventional gravity thickeners, those has been used until now. In this study, Solid Flux theory for gravity thickening was applied to the Solid Flux of DAF sludge through flotation in order to develop new methodology for treatment of DAF sludge. Also, characteristics of DAF sludge were investigated. From the experiment results, it was revealed that the higher the polymer dosage, at fixed the solid concentration, the greater the rising velocity becomes. When we applied solid flux theory, the relationship, which is similar to that of gravity thickening, has been achieved. Also, we could find the proper polymer dosage from the rising velocity is about 50 mg/L. Consequently, the limiting solid flux can be derived from the relationship between the total solid flux and the withdrawal velocity of DAF sludge. Furthermore, the factors, such as solid concentrations, bubble volume, pH, zeta potential, and temperature, have effects on the flotation and sedimentation for DAF sludge treatment.

키워드

참고문헌

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