The sedimentation period is 5 hours, the velocity of flow is 12 cm/minute, depth of water in the tank is 4.0 m. Assume the velocity of flow in the sedimentation tank as 22 cm/minute and the detention period as 8 hours.ĭesign a sedimentation for a water works, which supplies 1.4 x 10 6 litre/day water to the town. Design the suitable sedimentation tank of the water works fitted with mechanical sludge remover. Generally, the settling tanks are cleaned at an interval of 1 to 3 months.įollowing solved examples will clearly illustrate the design of simple sedimentation tanks:Ī water has to purify the water for a town whose daily demand is 9 × 10 6 litres/day. The frequency of sludge removal will depend upon the amount of suspended matter retained from water in the settling tank. The sludge is removed by gravity or pumping the compressed air and manual labour may be applied, if necessary. In order to remove sludge, the working of tank is stopped and water from the tank is drained out. A depth of about 50 cm to 60 cm is provided for this purpose. For the collection of sludge, it is necessary to provide enough space at the bottom of tank.
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