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.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
![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)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2ba7b197-c995-4e63-a9d7-a9a3d1a332ca%2Ff0184aea-4e5f-4691-9e5f-e95c699c21ab%2Fx5f9ngb_processed.jpeg&w=3840&q=75)
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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2ba7b197-c995-4e63-a9d7-a9a3d1a332ca%2Ff0184aea-4e5f-4691-9e5f-e95c699c21ab%2F21ftgx_processed.jpeg&w=3840&q=75)
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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