Table 1. Oxygen Reaction Rates Determined in Sewers
Grams per cubic meter-hour
(milligrams per liter-hour)
Test
Reach
0)
10A
15D
18D
18J
21G
24C
Length
in
meters
(2)
419
682
827
739
797
3220
Number of
runs
(3)
2
2
2
2
5
3
Slope,
s
(4)
0.0024
0.00303
0.0012
0.0097
0.00083
0.00071
Temperature,
T, in
degrees
centigrade
(5)
21.9
21.6
22.6
23.4
22.9
22.1
Time
in
hours
(6)
0.202
0.434
0.472
0.112
0.359
1.50
Mean
hydraulic
depth, d
m ,
in feet
(7)
0.088
0.088
0.084
0.313
0.145
0.277
Velocity,
u, in
meters
per second
(8)
0.576
0.438
0.482
1.852
0.618
0.653
Average
oxygen
deficit,
ID, in
milligrams
per liter
(9)
3.82
6.42
4.12
6.14
6.39
6.07
Rate of
change of
oxygen
concentration,
Δ(0
2 )
At
(10)
-2.9
-0.2
+0.3
+1.3
+0.9
-0.6
Rate of
reaeration,
R
f
(11)
3.9
6.2
3.4
5.0
2.2
1.3
Rate of
reaction of
oxygen,
Rr,
Col. 10
+
Col. 11
(12)
1.0
6.0
3.7
6.3
3.1
0.7
Rate of
reaction of
oxygen,
R
r b y
pot test
(13)
1.4
5.9
2.5
7.2
2.1
0.3
Self-Purification in Sewers