The key point of using ultraviolet (UV) technology to treat water pollution is to destroy its molecular structure through the energy of photons, turning harmful substances into harmless substances, and altering the DNA of living microorganisms, bacteria, and viruses, making them unable to replicate (reproduce) and different from other methods. (1) The UV method has no secondary pollution and no residue. (2) Other methods, especially the widely used chemical methods such as disinfection in water plants, mainly rely on chlorine gas,