A column analysis of a flocculating suspension is shown below. The initial solids concentration is 200 mg/L. The resulting matrix is given in Table 3. Table 3: Concentrated solids measured (mg/L) for a flocculent settlement column test. Time of sampling (minutes) Depth (m) 0.5 1 1.5 2 2.5 3 30 135 181 202 215 218 227 60 85 123 149 167 177 189 90 53 92 120 133 143 157 120 40 64 95 111 121 134 150 31 54 71 92 105 115 (a). Calculate the removal fraction at each depth and time. 180 25 45 55 67 83 97 (b). Based on the isoremoval flocculent sedimentation diagram given in Appendix 2, calculate the overall removal efficiency of a settling basin which is 3 meters deep with a detention time of 1 hour and 45 minutes.
A column analysis of a flocculating suspension is shown below. The initial solids concentration is 200 mg/L. The resulting matrix is given in Table 3. Table 3: Concentrated solids measured (mg/L) for a flocculent settlement column test. Time of sampling (minutes) Depth (m) 0.5 1 1.5 2 2.5 3 30 135 181 202 215 218 227 60 85 123 149 167 177 189 90 53 92 120 133 143 157 120 40 64 95 111 121 134 150 31 54 71 92 105 115 (a). Calculate the removal fraction at each depth and time. 180 25 45 55 67 83 97 (b). Based on the isoremoval flocculent sedimentation diagram given in Appendix 2, calculate the overall removal efficiency of a settling basin which is 3 meters deep with a detention time of 1 hour and 45 minutes.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A column analysis of a flocculating suspension is shown below. The initial
solids concentration is 200 mg/L. The resulting matrix is given in Table 3.
Table 3: Concentrated solids measured (mg/L) for a flocculent settlement column
test.
Time of sampling (minutes)
Depth
(m)
0.5
1
1.5
2
2.5
3
(a).
30
135
181
202
215
218
227
60
85
123
149
U
167
177
189
80%
90
53
92
120
133
143
157
Calculate the removal fraction at each depth and time.
120
40
64
95
111
121
134
70%
150
31
54
71
(b). Based on the isoremoval flocculent sedimentation diagram given in
Appendix 2, calculate the overall removal efficiency of a settling basin
which is 3 meters deep with a detention time of 1 hour and 45 minutes.
1.
92
105
115
Scanned with AnyScanner
O
L
60%
2.5
50%
40%
-20%
51
180
25
45
55
67
83
97
30%
10% S
1₂
150
120
06
09
O
3
Time. min
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Step 1: Introducing given data
VIEWStep 2: Formula for removal fraction
VIEWStep 3: Calculate the removal fraction at each depth and time
VIEWStep 4: Plot the isoremoval lines using interpolation
VIEWStep 5: Draw isoremoval lines
VIEWStep 6: Calculate depths for t0 = 105 min line
VIEWStep 7: Table
VIEWStep 8: Calculate overall removal efficiency (R)
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