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Figure 10-Pr17 shows a breakpoint chlorination curve for a water supply source. (a) Identify the chlorine dose or the range of doses where the following statements apply: (i) The free Cl residual is 0.5 mg/L. (ii) The combined Cl residual is 2.0 mg/L. (iii) The chlorine demand is 4.0 mg/L.

Figure 10-Pr17 shows a breakpoint chlorination curve for a water supply source. (a) Identify the chlorine dose or the range of doses where the following statements apply: (i) The free Cl residual is 0.5 mg/L. (ii) The combined Cl residual is 2.0 mg/L. (iii) The chlorine demand is 4.0 mg/L.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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512 REDOX PROCESSES AND DISINFECTION 2.5 2.0 1.5 1.0 0.5 0.0 1 2 3 4 8. Cl, dose (mg/L) FIGURE 10-Pr17. Breakpoint chlorination curve for a natural water source. However, when exposed to chlorine, only a portion of the potential oxidant demand is actually exerted. Assume (unrealistically) that 10% of the maximum potential demand is exerted instantaneously when the chlorine is first dosed into the solution, before any chlorine reacts with ammonia. Assume also that, when Cl, residual (mg/L)
Transcribed Image Text:512 REDOX PROCESSES AND DISINFECTION 2.5 2.0 1.5 1.0 0.5 0.0 1 2 3 4 8. Cl, dose (mg/L) FIGURE 10-Pr17. Breakpoint chlorination curve for a natural water source. However, when exposed to chlorine, only a portion of the potential oxidant demand is actually exerted. Assume (unrealistically) that 10% of the maximum potential demand is exerted instantaneously when the chlorine is first dosed into the solution, before any chlorine reacts with ammonia. Assume also that, when Cl, residual (mg/L)
combined chlorine residual of 4.0 mg/L as Cl2 immediately after dosing? (b) What NaOC1 dose is needed to generate a free chlorine residual of 1.0 mg/L as Cl2? 10-17. Figure 10-Pr17 shows a breakpoint chlorination curve for a water supply source. (a) Identify the chlorine dose or the range of doses where the following statements apply: (i) The free Cl residual is 0.5 mg/L. (ii) The combined Cl residual is 2.0 mg/L. (iii) The chlorine demand is 4.0 mg/L. (iv) When a small increment of chlorine is added, most of it undergoes no redox reaction. (v) When a small increment of chlorine is added, most of it reacts with N-contain- ing compounds. (vi) When a small increment of chlorine is added, most of it is reduced to Cl. (b) What is the chlorine demand when the chlorine dose is 7.0 mg/L? (c) If the primary reason for disinfecting with chloramines is to reduce the formation of
Transcribed Image Text:combined chlorine residual of 4.0 mg/L as Cl2 immediately after dosing? (b) What NaOC1 dose is needed to generate a free chlorine residual of 1.0 mg/L as Cl2? 10-17. Figure 10-Pr17 shows a breakpoint chlorination curve for a water supply source. (a) Identify the chlorine dose or the range of doses where the following statements apply: (i) The free Cl residual is 0.5 mg/L. (ii) The combined Cl residual is 2.0 mg/L. (iii) The chlorine demand is 4.0 mg/L. (iv) When a small increment of chlorine is added, most of it undergoes no redox reaction. (v) When a small increment of chlorine is added, most of it reacts with N-contain- ing compounds. (vi) When a small increment of chlorine is added, most of it is reduced to Cl. (b) What is the chlorine demand when the chlorine dose is 7.0 mg/L? (c) If the primary reason for disinfecting with chloramines is to reduce the formation of
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