Certification Action Line – Questions – October 2013

Oct. 1, 2013

1. Ozone occurs when oxygen radicals combine with oxygen molecules.             a. True             b. False 2. The most powerful oxidizer that can safely be …

1. Ozone occurs when oxygen radicals combine with oxygen molecules.

            a. True

            b. False

2. The most powerful oxidizer that can safely be applied in water treatment is:

            a. hydrogen peroxide (H2O2)

            b. potassium permanganate (KMnO4)

            c. ozone (O3)

            d. free chlorine (Cl2)

3. Combining ozone with hydrogen peroxide (or ultraviolet light) creates oxidation potential that is:

            a. equivalent to the weighted average at the combined ozone and the hydrogen peroxide (or UV)

            b. greater than either the ozone or hydrogen peroxide (or UV) separately

            c. subdued below that of the ozone alone

4. Ozone in drinking water can be used to inactivate protozoan cysts and oocysts, such as Giardia and Cryptosporidium.

            a. True

            b. False

5. Ozone will react with and destroy the following volatile organic chemical (VOC) compound(s):

           a. trichloroethylene

           b. benzene

           c. carbon tetrachloride

6. The need to dry the feed gas to -60° C dew point is most critical for:

            a.  ultraviolet ozone generators

            b. corona discharge ozone generators

            c. both a and b

7. Concentrations of ozone produced in air and that can be transferred to water are approximately __________ times greater using corona discharge generators than ultraviolet ozone generators:

            a. 2-5

            b. 5-10

            c. 10-100

8. Ozone compatible materials include:

            a. synthetic rubbers

            b. rigid copper pipe

            c. galvanized metal pipe

            d. PVDF (Kynar)

9. Ozone can be used to remove hydrogen sulfide from water.

            a. True

            b. False

10. Ozonated waters containing organic compounds such as tannins and synthetic organic chemicals (SOCs) can result in __________ microbiological regrowths downstream of the ozonation process. 

            a. increased

            b. lower

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