Alum mixed raw water after passing through the Flash Mixer needs to pass through the Flocculation Tank for the gentle mixing and agglomeration of the flocs before entering the Clarifers for their removal through settlement. The flocculation tank is located at the center of the Clarifer and is treated as one unit called Clarifier Cum Flocculation tank. The size and shape of the land provided for the construction of the treatment plant is such that Flash Mixer and Clarifier Cum Flocculation Tanks are located at a distance from one another. Therefore, a channel will be constructed to serve as a Feeding Channel for the Clarifier Cum Flocculation tanks. The Feeding Channel shall collect chemical mixed water from the Channel / Launder built around the Flash Mixer and distribute equally between the three Clarifier Cum Flash Mixers. The design of the Clarifier Feeding is as follows:
Flow through the channel = 35.0 Cusecs
Velocity through the channel = 3.0 Ft / s
X Sectional Area of Flow = 35 / 3
= 11.66 Sft
Width of the Channel = 3- 4” Ft
Effective Water Depth of the Channel = 3’ - 6”
Free Board = 1.0 Ft
Total Depth of the channel = 4.5 Ft
Water shall enter the Flocculation Tanks through their respective Inlet Pipes. One end of the Inlet pipe shall be connected to the Feeding channel (3’- 4” W x 4’ -6” D) through a Valve Chamber and the other to the Flocculation Tank at its center. The valve shall serve to stop the flow in the Clarifier cum Flocculation Tank during breakdowns. The design of the inlet channel is given under the Design of Flocculation Tank.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment