A wastewater treatment plant treats a wastewater at a flowrate of 10 million liters per day. The wastewater has zero dissolved oxygen when it leaves the plant. The NPDES requirements include a minimum dissolved oxygen concentration of 2 mg/L in the discharge to protect the river. As an engineer, you must design a reaeration system to provide a minimum dissolved oxygen concentration of 3 mg/L (using a 1.5 safety factor). Use the reaeration data for the reactor with the largest volume to design a system. Assume each reactor that you used in lab represents the capacity of one aerator. How many aerators will be required to reaerate the water? Hint: it will be a lot of them. Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1,88 2,14 2,43 2,77 2,96 3,18 3,39 3,56 3,7 3,81 3,95 4,19 4,38 4,88 5,12 5,33 5,46 5,59 5,77 5,94 6,1 6,28 6,39 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 6,5 6,61 6,69 6,49 6,84 6,9 6,93 6,96 7,01 7,02 7,06 7,11 7,13 7,15 7,19 7,2 7,23 7,26 7,31 7,35 7,37 7,39 7,42 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 7,41 7,42 7,43 7,45 7,51 7,51 7,54 7,53 7,56 7,6 7,62 7,66 7,69 7,72 7,73 7,76 7,79 7,81 7,83 7,86 7,89 7,91 7,72 70 71 72 73 74 75 7,91 7,73 7,94 7,96 7,98 8
A wastewater treatment plant treats a wastewater at a flowrate of 10 million liters per day. The wastewater has zero dissolved oxygen when it leaves the plant. The NPDES requirements include a minimum dissolved oxygen concentration of 2 mg/L in the discharge to protect the river. As an engineer, you must design a reaeration system to provide a minimum dissolved oxygen concentration of 3 mg/L (using a 1.5 safety factor). Use the reaeration data for the reactor with the largest volume to design a system. Assume each reactor that you used in lab represents the capacity of one aerator. How many aerators will be required to reaerate the water? Hint: it will be a lot of them. Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1,88 2,14 2,43 2,77 2,96 3,18 3,39 3,56 3,7 3,81 3,95 4,19 4,38 4,88 5,12 5,33 5,46 5,59 5,77 5,94 6,1 6,28 6,39 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 6,5 6,61 6,69 6,49 6,84 6,9 6,93 6,96 7,01 7,02 7,06 7,11 7,13 7,15 7,19 7,2 7,23 7,26 7,31 7,35 7,37 7,39 7,42 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 7,41 7,42 7,43 7,45 7,51 7,51 7,54 7,53 7,56 7,6 7,62 7,66 7,69 7,72 7,73 7,76 7,79 7,81 7,83 7,86 7,89 7,91 7,72 70 71 72 73 74 75 7,91 7,73 7,94 7,96 7,98 8
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![A wastewater treatment plant treats a wastewater at a flowrate
of 10 million liters per day. The wastewater has zero dissolved
oxygen when it leaves the plant. The NPDES requirements
include a minimum dissolved oxygen concentration of 2 mg/L
in the discharge to protect the river. As an engineer, you must
design a reaeration system to provide a minimum dissolved
oxygen concentration of 3 mg/L (using a 1.5 safety factor). Use
the reaeration data for the reactor with the largest volume to
design a system. Assume each reactor that you used in lab
represents the capacity of one aerator. How many aerators will
be required to reaerate the water? Hint: it will be a lot of them.
DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L]
Time [min]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1,88
2,14
2,43
2,77
2,96
3,18
3,39
3,56
3,7
3,81
3,95
4,19
4,38
4,88
5,12
5,33
5,46
5,59
5,77
5,94
6,1
6,28
6,39
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
6,5
6,61
6,69
6,49
6,84
6,9
6,93
6,96
7,01
7,02
7,06
7,11
7,13
7,15
7,19
7,2
7,23
7,26
7,31
7,35
7,37
7,39
7,42
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
7,41
7,42
7,43
7,45
7,51
7,51
7,54
7,53
7,56
7,6
7,62
7,66
7,69
7,72
7,73
7,76
7,79
7,81
7,83
7,86
7,89
7,91
7,72
70
71
72
73
74
75
7,91
7,73
7,94
7,96
7,98
8](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7136435d-2c0b-4a6a-bb14-2bf831d8826c%2F82a4c962-0acf-4c2e-9663-2a314584c4f8%2Fi80q4w4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A wastewater treatment plant treats a wastewater at a flowrate
of 10 million liters per day. The wastewater has zero dissolved
oxygen when it leaves the plant. The NPDES requirements
include a minimum dissolved oxygen concentration of 2 mg/L
in the discharge to protect the river. As an engineer, you must
design a reaeration system to provide a minimum dissolved
oxygen concentration of 3 mg/L (using a 1.5 safety factor). Use
the reaeration data for the reactor with the largest volume to
design a system. Assume each reactor that you used in lab
represents the capacity of one aerator. How many aerators will
be required to reaerate the water? Hint: it will be a lot of them.
DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L] Time [min] DO [mg/L]
Time [min]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1,88
2,14
2,43
2,77
2,96
3,18
3,39
3,56
3,7
3,81
3,95
4,19
4,38
4,88
5,12
5,33
5,46
5,59
5,77
5,94
6,1
6,28
6,39
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
6,5
6,61
6,69
6,49
6,84
6,9
6,93
6,96
7,01
7,02
7,06
7,11
7,13
7,15
7,19
7,2
7,23
7,26
7,31
7,35
7,37
7,39
7,42
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
7,41
7,42
7,43
7,45
7,51
7,51
7,54
7,53
7,56
7,6
7,62
7,66
7,69
7,72
7,73
7,76
7,79
7,81
7,83
7,86
7,89
7,91
7,72
70
71
72
73
74
75
7,91
7,73
7,94
7,96
7,98
8
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