ABSTRACT
The final process is disinfection and it serves two main purposes. The primary purpose of disinfection is to kill or inactivate pathogens. The secondary purpose is to provide a disinfectant residual in finished water and prevent microbial regrowth in water distribution systems. Although the majority of pathogens (99 to 99.9%) are removed by coagulation, flocculation, sedimentation, and filtration, disinfection is a critical process to protect the public from contracting waterborne diseases. Common disinfectants are chlorine, chloramines, ozone, chlorine dioxide, and ultraviolet radiation.
