Which of the following is NOT a type of disinfection method used in wastewater treatment?

Filtration is not classified as a disinfection method within wastewater treatment systems. Rather, it serves as a physical separation process that removes suspended solids and particulate matter from water. While filtration can improve the clarity and quality of water, it does not inherently kill or inactivate pathogens, which is the primary goal of disinfection.

On the other hand, chlorine, ozonation, and ultraviolet (UV) radiation are all established disinfection methods. Chlorine is widely used for its ability to kill bacteria and viruses, providing effective microbial control. Ozonation utilizes ozone, a powerful oxidant, to eliminate pathogens and is recognized for its effectiveness and environmental benefits. Ultraviolet radiation uses UV light to disrupt the DNA of microorganisms, effectively preventing their reproduction and thereby rendering them inactive.

Understanding the specific roles of these processes is essential for effective wastewater treatment, highlighting the importance of distinguishing between methods that disinfect and those that primarily remove solids.