2. A water treatment plant doses chlorine gas and liquid ammonia for chloramine disinfection. The ammonia dose is 1.0mg/L as N, which of the following dose would achieve best chloramine formation for disinfection? Note the source water has some natural organic matter, and high dose of Cl2? may produce excess amount of disinfection byproducts. ( 2p solutionspile.com

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2. A water treatment plant doses chlorine gas and liquid ammonia for chloramine disinfection. The ammonia dose is

1.0 mg / L

as

N

, which of the following dose would achieve best chloramine formation for disinfection? Note the source water has some natural organic matter, and high dose of

Cl_{2}

may produce excess amount of disinfection byproducts. (

2 pts

) a.

4.5 mg / L

as

Cl_{2}

. b.

6 mg / L

as

Cl_{2}

. c.

7.5 mg / L

as

Cl_{2}

. d.

10 mg / L

as

Cl_{2}

. 3. When using

Cl_{2}

gas or sodium hypochlorite solution as disinfectant, at which

pH

would you expect highest inactivation if

CT

remains the same. (2 pts) a.

pH 6.5

b.

pH 7.0

c.

pH 7.5

d.

pH 8.0

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