In: Civil Engineering
A Waste water treatment units is proposed to be designed for the
Wilayat of Sur. Population of Sur is 200,000 and an average sewage
generation is 210 liter per capita per day. Design an appropriate
waste water treatment plant using the following given data. If
needed assume other necessary data.
Approach channel velocity = 42 m/min, d = 1.5 w Design three
aerated grit chamber Detention time in grit chamber = 3 min Depth
of aerated grit chamber = 2.0 m Depth to width ratio in aerated
grit chamber is 1:1.2 Total depth of primary clarifier = 3 m
(Mechanical Sludge removal) Overflow rate = 20 m3/m2.d Detention
time in the primary clarifier should be greater than 1.5 hours
Secondary clarifier with a depth of water equal to 0.5 times the
Length (Mechanical Sludge removal) Detention time in secondary
clarifier = 2 hours
Design (size of the unit) the following units of the treatment process:
Rectangular Bar screen channel, Rectangular Aerated Grit chamber, Six Circular Primary Clarifier, and Six Square Secondary Sedimentation tank.