Design of Settling Tank

1. SFL for calculating area and check overflow rate
2. Depth of tank (>12 ft)
   Depth = Clarifying + Thickening + Storage
3. L : D = 10 ~15
4. Inlet orifice velocity < 15 ~ 30 ft/min to avoid density current
5. Continuously recycling sludge by centrifugal pumping
6. Sludge collector-hopper has a high capacity for continuous sludge recycling

    Others same as primary settling tank.

SUMMARY

• Design criteria
• Influent and effluent quality
• Aeration tank
• Aeration system
• Final settling tank