Table 2. Determinations of Transfer Coefficients of Oxygen to Sewer Slimes (continued)
Test
Reach
(1)
(a)
Oxygen exchange
coefficient,
f,
in meters
per hour
(10)
(a)
Rate
of oxygen
supply,
Rf, in
grams per
cubic meter-hour
(11)
Rate of change
of oxygen
Rate of Reaction
concentration,
of oxygen, R
r ,
Δ(θ2>
in grams per
At
cubic meter-hour
grams per
cubic meter-hour
(12)
(13)
(b)
Rate
of loss
of oxygen
to
slime layer,
R
e , in
grams per
cubic meter-hour
(14)
Oxygen transfer
coefficient,
e,
observed in meters
per hour
(15)
e ~
(su)
1
^
(16)
(c)
Oxygen transfer
coefficient,
e,
calculated in
meters per hour
(17)
10A
15D-a
15D-b
18D
18F
18H
18J-a
18J-b
21G
24C
0.0937
0.0867
0.102
0.0705
0.154
0.276
0.281
0.441
0.059
0.060
4.2
6.9
3.8
4.1
6.7
8.8
9.4
26.9
2.6
1.1
-5.2
-2.5
-4.1
-3.7
-4.9
-6.0
-8.2
-8.5
-3.0
-0.6
2.5
6.9
0.10
4.6
4.8
0.26
5.1
2.8
0.19
3.5
4.3
0.12
6.1
5.5
0.30
7.3
7.5
0.43
5.9
11.7
1.10
8.6
26.8
1.08
2.8
2.8
0.18
0.4
1.3
0.14
Logarithmic Average
5.3
2.65
7.0
4.3
4.7
4.6
3.5
8.4
7.5
8.1
6.2
0.20
0.20
0.23
0.14
0.35
0.66
0.70
0.77
0.12
0.12
(a) Computed from predictive equation, (b) Column 11 - Column 12 - Column 13. (c) By e = 5.3 (su)
1
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Self-Purification in Sewers