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분야
pptxThe structural problem& the chemical injection locations
Key concepts - In-Line
- Detention time < 1sec
- Use mixer
2. Flocculation
Design impeller and tank type, diffuser walls and baffle
Key concepts - Baffling (Diffuser wall)
- Tapered mixing energy
(High to low to prevent floc breakage)
3. Sedimentation
Design launder type, structure, sludge and scum model
Key concepts –Long & Narrow
4. Filtration
Key concepts - Constant level filtration
- Multi-media filtration
- Biologically active filters
- Water & air backwash system
- Dual lateral underdrain system
2. Design impeller and tank type affecting energy efficiency, cost, flocculation size. Design Diffuser Walls and Baffles used for Minimizing Short Circuiting
3. Design launder type, structure, sludge and scum model
Filtration의 세번째 key concept 이유: (to promote readily biodegradable organics) -> GAC
In this slide, I will explain 2 kinds of problems of original flash mix. Structural and chemicals.
First, It has structural problems. As you can see the water flow direction, inlet locates downside and outlet locates upside.
Through this, we can know that axial impeller is not suitable. Also, because of wide width of tank, it has poor mixing.
Second, there is a problem with chemicals. PAC is injected with Cl2, so activation of Cl2 must be restricted.
Also, using alum may cause settling.
Alum lowered pH in localized area. To overcome this problem, we need more alkali materials and it means lots of cost.
