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Book 1 Ch 6 - Disinfection Practice Quiz

front 1

Calculate the chlorine dosage, mg/L, from the following data:

Plant flow: 22,500,000 gallons per day
Chlorine feed rate: 1,600 lbs/day
Chlorine purity: 100%
Water pH: 7.5

back 1

8.5 mg/L

front 2

Which of the following will cause chlorine demand?

back 2

Hydrogen sulfide (H2S)

front 3

What is the correct equation for chlorine dosage?

back 3

Chlorine demand + chlorine residual = chlorine dosage

front 4

What is the gaseous chlorine feed rate, lbs/day, of the surface water plant that treats 45 MGD with a dosage of 18 mg/L?

back 4

6,755 lbs/day

front 5

To avoid icing, or freezing of the chlorine in the supply lines, the recommended maximum draw-off rate of chlorine gas from a 150 pound cylinder is what?

back 5

40 lbs/day

front 6

What process is required by the SWTR for all surface water supply systems?

back 6

Disinfection

front 7

The addition of free chlorine to water that contains dissolved organic material could result in the formation of what potentially carcinogenic compounds?

back 7

Trihalomethanes

front 8

This gas is non-flammable, non-explosive, 2.5 times heavier than air with a liquid to gas expansion ratio of 450:1?

back 8

Chlorine

front 9

When gaseous chlorine is injected into a water supply, what two acids are formed?

back 9

Hypochlorous and hydrochloric acids

front 10

How many parts of chlorine and ammonia will create mono-chloramine?

back 10

Three parts of chlorine and one part of ammonia