The results of a chlorine demand test on a raw water at 20°C are given in the following table
Sample | Chlorine Dosage (mg/l) | Residual Chlorine Aftel' 10 Min of Contact (mg/l) |
1 | 0.20 | 0.19 |
2 | 0.40 | 0.37 |
3 | 0.60 | 0.51 |
4 | 0.80 | 0.50 |
5 | 1.00 | 0.20 |
6 | 1.20 | 0.40 |
7 | 1.40 | 0.60 |
8 | 1.60 | 0.80 |
(a) Sketch the chlorine demand curve.
(b) What is the breakpoint chlorine dosage?
(c) What is the chlorine demand at a chlorine dosage of 1.20 mg/l.
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