The ultraviolet germicidal lamp is actually a low-pressure mercury lamp. Low pressure mercury lamp is the use of low mercury vapor pressure (<10-2Pa) to produce ultraviolet light, its luminescent spectrum is mainly two: one is 253.7nm wavelength; the other is 185nm wavelength, and these two are all invisible ultraviolet rays.
The ultraviolet ray tube does not need to be converted to visible light, the wavelength of 100-200nm can play a very good bactericidal effect, because the absorption spectrum of the light wave has a rule, the ultraviolet rays have the maximum absorption in the 100-200nm, and the absorbed ultraviolet rays actually act on the cell genetic material, DNA. The energy of UV photons is absorbed by the base pairs in DNA, causing genetic variation, causing the bacteria to die immediately or not to reproduce the offspring, and to achieve the purpose of sterilization.
Whether aquaculture farms or aquariums often face the following two problems: first, the water gradually grows full of seaweed; two, the parasites in water cause fish diseases.
In the analysis of the above two problems, many kinds of plankton, bacteria, viruses, fungi and protozoa are often grown in water bodies, which lead to the eutrophication and metamorphism of water bodies, and affect the health and growth of fish and other aquatic animals.