1801:
Johann Ritter, a pharmacist in Silesia (now in Poland) discovered UV light by demonstrating that silver chloride is decomposed most efficiently by the invisible rays beyond the violet.
1900:
The Danish physician Niels Finsen, considered the founder of modern phototherapy, discovered a UV treatment for lupus vulgaris, a form of skin tuberculosis. For this discovery, he received the nobel prize in physiology or medicine
1903:
Bernard and Morgan found that the most sensitive wavelengths for the inactivation of bacteria are around 250 nm.
1910:
Henri et al described the first commercial UV facility that used UV light to disinfect water in Marseilles, France.
1929, 1930:
Gates (1929, 1930) was the first to carry out detailed investigations of the action spectrum of E. coli; he showed that the optimal wavelength for inactivation was about 260 nm.
1938:
Westinghouse introduced the first fluorescent gas discharge lamp.
1955:
The first modern installations of UV disinfection systems using low-pressure UV lamps in water treatment plants occurred in Switzerland and Austria.
1966:
Department of health, education and welfare (DHEW) issued guidelines for disinfection by UV.
1975:
UV disinfection was introduced in Norway as a result of concern with the disinfection by-products from the use of chlorine disinfection.
1978:
A full-scale UV system was successfully demonstrated at the N.W. Bergen wastewater treatment plant.
1985:
There were over 1,500 UV installations in Europe. Most were for the treatment of groundwater and bank-filtered water.
1998:
Bolton et al found that UV was very effective against Cryptosporidium (and later Giardia), contrary to the perception at that time that UV disinfection was not effective. Their paper, presented at the annual conference of the American water works association (AWWA), changed this perception.
For more information, inquiries or to book an interview please Contact:
Shenzhen Hechuang Hitech CO., LTD.
info@hc-hitech.com
Toll Free +86-755 2850 4426
Shenzhen Hechuang Hitech CO., LTD. is a National High-tech Enterprise, which has won a number of invention patent technology awards. We focuses on the Research, Development, Production and Application of UVC-LED Technology. It adopts innovative technologies of revolutionary optics and fluid science, which can kill bacteria and viruses in 0.2 seconds, with a killing rate of 99.9999%. Hechuang Hitech provides safer, more efficient and more humanized sterilization module design for Water Air and Surface Disinfection products.
