A Waste water treatment units is proposed to be designed for theWilayat of Sur. Population of Sur is 200,000 and an average sewagegeneration is 210 liter per capita per day. Design an appropriatewaste water treatment plant using the following given data. Ifneeded assume other necessary data.
Approach channel velocity = 42 m/min, d = 1.5 w Design threeaerated grit chamber Detention time in grit chamber = 3 min Depthof aerated grit chamber = 2.0 m Depth to width ratio in aeratedgrit chamber is 1:1.2 Total depth of primary clarifier = 3 m(Mechanical Sludge removal) Overflow rate = 20 m3/m2.d Detentiontime in the primary clarifier should be greater than 1.5 hoursSecondary clarifier with a depth of water equal to 0.5 times theLength (Mechanical Sludge removal) Detention time in secondaryclarifier = 2 hours
Design (size of the unit) the following units of the treatmentprocess:
Rectangular Bar screen channel, Rectangular Aerated Gritchamber, Six Circular Primary Clarifier, and Six Square SecondarySedimentation tank.
