What type of disinfection is used in wastewater treatment involving chlorination?

Chlorination is a method of disinfection that utilizes chemicals to eliminate pathogens in wastewater. This process involves adding chlorine or chlorine compounds to the water, which react with microbial cells to inactivate them. Chemical disinfection methods, such as chlorination, are widely used owing to their effectiveness in reducing harmful bacteria, viruses, and other pathogens that may be present in wastewater.

In contrast, other methods like filtration and thermal disinfection serve different purposes. Filtration physically removes particles and sediments from the water but does not necessarily kill pathogens; it is not a chemical process. Similarly, thermal disinfection employs heat to kill microorganisms but does not involve the use of chemical agents like chlorine. Thus, chlorination specifically falls under the category of chemical disinfection due to its reliance on chlorine's biochemical properties to ensure the safety of treated wastewater.