In 24 hours the suspended particles settle down at the bottom of the sedimentation tank. The time it takes for water to be stored in a sedimentation tank is 24 hours. Sedimentation tank Classified on the basis of processįeel & draw sedimentation tank - In this type of sedimentation tank water is stored for some time in the sedimentation tank. Hopper bottom sedimentation tank - In this type of sedimentation tank, The bottom of the sedimentation tank is hopper shaped and the upper face of the sedimentation tank is the same as a rectangular sedimentation tank. In circular sedimentation tank sludge is collected mechanically and collected sludge carried through sludge pipe at the bottom, Circular sedimentation tank are highly efficient for clarification but they are costly and uneconomically compared to rectangular sedimentation tank.
Rectangular sedimentation tank are suitable for large capacities of water treatment plants and maintenance costs are low compared to vertical sedimentation tank.Ĭircular sedimentation tank - Vertical flow type sedimentation tank are preferred for circular sedimentation tank. In this type of sedimentation tank flow is placed in horizontal direction and baffle walls are provided to prevent short circuiting. Rectangular sedimentation tank - Rectangular tanks are widely used and mostly preferred sedimentation tank.
Sedimentation tank Classified on the basis of shape - In this type of sedimentation tank, Sedimentation tanks are classified on the basis of shape. It is calculated by the following formula. Generally flow velocity of a sedimentation tank lies between 0.15 - 0.9 m/min. Surface loading rate = Discharge / Surface areaįlow velocity - It is a velocity in which water enters into the sedimentation tank. Surface loading rate of sedimentation tank is calculated by following formula. Generally the surface loading rate of a sedimentation tank lies between 500 to 700 lit/hr/m2. Surface loading rate - Surface loading rate is defined as the rate of settlement of suspended particles in a given surface area of a sedimentation tank. Detention time of sedimentation tank is calculated by following formula -ĭetention time = V olume of tank / D ischarge Generally the detention time of a sedimentation tank is 4 - 8 hours. Detention time - Detention time is the time taken by water to travel from inlet pipe of sedimentation tank to outlet pipe of sedimentation tank is called detention time in sedimentation tank.
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