What substance is known for being non-toxic to aquatic organisms and adding oxygen to treated wastewater?

Ozone is recognized for its ability to add oxygen to treated wastewater while being non-toxic to aquatic organisms. This property makes it a valuable oxidizing agent in wastewater treatment processes. When ozone is introduced into the water, it can effectively break down organic matter, pathogens, and other contaminants while simultaneously increasing the dissolved oxygen levels, which is essential for the health of aquatic life.

Ozone is also preferred in many applications because it decomposes rapidly, leaving no harmful residues. This characteristic ensures that the treated water remains safe for discharge into natural water bodies or for reuse.

In contrast, hydrogen peroxide, while also an oxidizing agent and capable of treating wastewater, can produce unwanted by-products and has limitations in its application. Chlorine dioxide is effective as a disinfectant but can generate harmful by-products when reacting with organic materials. UV light, though useful for disinfection, does not add oxygen to the water. Therefore, ozone stands out due to its dual benefits of providing oxygen and being safe for aquatic ecosystems.