What is ozone effective against in water treatment?

Ozone is a powerful oxidizing agent widely used in water treatment due to its effectiveness against a broad spectrum of contaminants. One of the significant advantages of ozone in aqueous environments is its ability to effectively inactivate bacteria, viruses, and protozoan cysts, such as amoebic cysts. Its oxidative properties break down organic compounds, which includes phenols, and can also lead to the disinfection of water by targeting pathogens.

When ozone is introduced into water, it reacts with the cellular structures of microorganisms, leading to their destruction. As it breaks down organic material and disinfects water, it also helps in removing taste and odor-causing compounds, such as phenols.

Thus, in the context of the question, the correct answer reflects the comprehensive capabilities of ozone in treating water. By being effective against amoebic cysts, bacteria, phenols, and viruses, it demonstrates a multi-faceted approach in improving water quality and safety for consumption. Hence, the choice that encompasses all of these aspects is the most accurate.