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A wastewater was tested in a settling column test with the following results in terms of suspended sediment concentration:
At t = 30 minutes
Depth below surface, h (cm)
Concentration remaining, c/co
0.23
0.81
0.94
0.97
0.98
At t = 60 minutes
0.05
0.46
0.73
0.86
0.92
At t = 90 minutes
0.03
112
192
0.52
272
0.70
352
0.83
a. What type of settling is indicated by these data?
b. This particular wastewater is proposed to be treated in a rectangular sedimentation tank having a detention time of 2 hours and a depth of 4 meters. Estimate the percent of suspended sediments that will be removed.
c. If the wastewater flow rate is 7,500 m3/day. what needs to be the area and volume of the sedimentation tank?
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