Environmental Engineering Reference
In-Depth Information
Chap7.fm Page 97 Wednesday, April 18, 2007 3:27 PM
Table 7-4
Approximate amount of dechlorination chemical needed for 100 mg/L chlorine residual and 30 m of pipeline
(SI units)
Grams of Chemical Needed
Pipeline
Diameter
mm
Sodium
Thiosulfate
Sodium
Bisulfite
Sodium
Metabisulfite
Sodium
Sulfite
Calcium
Thiosulfate
Ascorbic
Acid
Sodium
Ascorbate
50
11.19
9.48
8.65
11.54
7.18
14.72
16.49
100
44.75
37.92
34.62
46.16
28.73
58.88
65.94
150
100.68
85.31
77.89
103.86
64.64
132.47
148.37
200
178.98
151.66
138.47
184.63
114.92
235.50
263.76
250
279.66
236.97
216.37
288.49
179.57
367.97
412.13
300
402.71
341.24
311.57
415.42
258.58
529.88
593.46
400
715.92
606.65
553.90
738.53
459.70
942.00
1,055.04
450
906.09
767.79
701.02
934.70
581.80
11,92.22
1,335.29
500
1,118.63
947.89
865.46
1,153.95
718.28
1,471.88
1,648.50
600
1,610.82
1,364.96
1,246.27
1,661.69
1,034.32
2,119.50
2,373.84
800
2,863.68
2,426.59
2,215.58
2,954.11
1,838.78
3,768.00
4,220.16
900
3,624.35
3,071.16
2,804.10
3,738.80
2,327.21
4,768.88
5,341.14
1,000
4,474.50
3,791.55
3,461.85
4,615.80
2,873.10
5,887.50
6,594.00
1,200
6,443.28
5,459.83
4,985.06
6,646.75
4,137.26
8,478.00
9,495.36
1,400
8,770.02
7,431.44
6,785.23
9,046.97
5,631.28
11,539.50
12,924.24
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