Effluent and wastewater treatment with UV light systems
The development history of wastewater disinfection and treatment with UV radiation goes back to less than forty years ago. Note different the efforts to develop more efficient water treatment methods mainly began after revealing the hazards of chlorination byproducts and the inefficiency of conventional doses of chlorine in deactivating the protozoa cysts.
Today, public health decision-makers pay special attention to preparing the conditions and setting the rules for the safe use of treated wastewater in irrigation. Disinfecting effluent for reusing wastewater or using treated wastewater in aggregation often relied on chemical agents. Chlorination is a proven technology for disinfection and wastewater treatment. However, using chlorination is being reinvestigated because of many concerns. Therefore, the increasing awareness about the disadvantages of chemical disinfectants has paved the way for UV radiation as a safer and more effective alternative. In 1988, about 300 water treatment plants, and in 2004, about 4,300 wastewater treatment plants in the United States (over 20% of the whole plants that were mostly newly-built) used the UV disinfection system to disinfect effluent. The number of UV-powered treatment systems in the United States, Europe, and Eastern Asia has increased significantly and is expected to expand further in the coming years so that many factories’ discharge or sewages will be disinfected using top-notch UV radiation without environmental complications.