Question

1. ______ is the strongest oxidant and strongest disinfectant available for potable water treatment. this unique material can be utilized for specific water treatment applications, including disinfection, taste and odor control, color removal, iron and manganese oxidation, hydrogen sulfide removal, nitrite and cyanide destruction, oxidation of organics such as phenols, pesticides, and some detergents, algae destruction and removal, and as a coagulant aid.

a. ozone
b. chloramination
c. ultraviolet light
d. chlorine dioxide

1. a major problem with disinfection using ______ is that bacterial regrowth can occur downstream of the application site in the distribution.

a. ozone
b. chloramination
c. ultraviolet light
d. b and c are correct

Explanation:

For question 6: Ozone is a highly potent oxidant and disinfectant used in potable water treatment, capable of all the listed applications due to its strong oxidative properties.
For question 7: Ozone breaks down quickly in water, leaving no residual to prevent bacterial regrowth. Ultraviolet light only inactivates microbes at the treatment site and leaves no residual, so both allow downstream bacterial regrowth. Chloramination leaves a long-lasting residual that prevents regrowth.

Answer:

1. a. Ozone
2. d. b and c are correct