CIVL 456: Equalization Tank Design

Due: 9/11/96

Zionsville, Indiana

Problem Statement: Analyze the following flow and CBOD data obtained from the City of Zionsville's WWTP, and determine the following:
1) Determine the equalized flow rate appropriate for this data.
2) Establish a volume suitable for their equalization tank.
3) Determine what impact the use of this equalization tank would have on the CBOD coming into the plant (identify the CBOD extremes [hi and lo] both before and after flow equalization.

Zionsville WWTP Plant Data
Time FLOW BOD
hrs MGD mg/L
---- ---- ----
0.5 0.67 67
1 0.72 78
1.5 0.73 69
2 0.67 74
2.5 0.77 87
3 0.89 69
3.5 0.66 55
4 0.78 73
4.5 0.67 88
5 0.83 93
5.5 0.66 111
6 0.66 152
6.5 0.57 176
7 0.75 188
7.5 0.76 193
8 0.9 212
8.5 0.69 203
9 0.93 234
9.5 0.75 224
10 1.33 227
10.5 1.89 256
11 2.05 278
11.5 1.88 245
12 1.33 205
12.5 1.56 201
13 1.23 199
13.5 1.59 178
14 1.23 156
14.5 0.99 187
15 0.87 189
15.5 1.22 194
16 1.42 203
16.5 1.53 205
17 1.49 164
17.5 1.33 212
18 1.45 166
18.5 1.54 189
19 1.27 145
19.5 1.36 167
20 1.66 178
20.5 1.56 199
21 2.00 245
21.5 1.88 234
22 0.97 219
22.5 1.19 187
23 1.14 163
23.5 1.01 142
24 1.00 102

Last Modified: 3 September 1996; alleman@ce.ecn.purdue.edu