TwoTankAmin
Fish Connoisseur
Some cells which are damaged but not killed by UV exposure are able to heal themselves. However, for most things if the UV level and exposure times are proper, it pretty much kills it all. Also, UV research is not limited to its use in water, specifically aquariums. UV is being used in lieu of chlorine/chloramine in some drinking water systems.
UV is used as much for killing pathogens in the air as it is in water, probably moreso. Also, the technology has changed over the years. Research into continuous v.s. pulsed is one example, and then either combining different types of UV or using specific frequency on different microorganisms has also gained in standing for effectiveness.
Wei Luo, Anjun Chen, Min Chen, Wei Dong, Xiaoyan Hou,
Comparison of sterilization efficiency of pulsed and continuous UV light using tunable frequency UV system,
Innovative Food Science & Emerging Technologies,
Volume 26, 2014, Pages 220-225, ISSN 1466-8564,
(https://www.sciencedirect.com/science/article/pii/S1466856414001520)
Abstract:
Whether or not pulsed UV light was more bactericidal than continuous UV was still debated. The aim of this work was to compare the disinfection efficiency of continuous and pulsed UV light at different frequencies. A tunable frequency UV system was designed to allow indicator bacteria to be exposed to continuous or pulsed UV light with a same low pressure mercury lamp, which can emit UV light with a wavelength of 253.7nm, and the pulse frequency was adjustable. The germicidal ability against Escherichia coli and Salmonella spp. of pulsed UV light at frequencies 0 (represented continuous irradiation), 2, 4, 6, 8, 10Hz was compared. The results showed that pulse frequency is a factor influencing the ultimate inactivation ability of pulsed UV light and at specific frequencies pulsed UV light was more bactericidal than continuous UV.
Industrial relevance
Pulsed UV light for microbial inactivation has been applied for more than 30years. As a very important factor, pulse frequency has been ignored for a long time. We have demonstrated that at some specific frequencies, pulsed UV light was more bactericidal than continuous UV using low pressure mercury lamp. And if further studies could come to the similar results in inert-gas flash lamps and/or medium-pressure UV lamps and figure out the optimal pulse frequency, it might improve the sterilization efficiency of the existing pulsed UV system.
UV is used as much for killing pathogens in the air as it is in water, probably moreso. Also, the technology has changed over the years. Research into continuous v.s. pulsed is one example, and then either combining different types of UV or using specific frequency on different microorganisms has also gained in standing for effectiveness.
Wei Luo, Anjun Chen, Min Chen, Wei Dong, Xiaoyan Hou,
Comparison of sterilization efficiency of pulsed and continuous UV light using tunable frequency UV system,
Innovative Food Science & Emerging Technologies,
Volume 26, 2014, Pages 220-225, ISSN 1466-8564,
(https://www.sciencedirect.com/science/article/pii/S1466856414001520)
Abstract:
Whether or not pulsed UV light was more bactericidal than continuous UV was still debated. The aim of this work was to compare the disinfection efficiency of continuous and pulsed UV light at different frequencies. A tunable frequency UV system was designed to allow indicator bacteria to be exposed to continuous or pulsed UV light with a same low pressure mercury lamp, which can emit UV light with a wavelength of 253.7nm, and the pulse frequency was adjustable. The germicidal ability against Escherichia coli and Salmonella spp. of pulsed UV light at frequencies 0 (represented continuous irradiation), 2, 4, 6, 8, 10Hz was compared. The results showed that pulse frequency is a factor influencing the ultimate inactivation ability of pulsed UV light and at specific frequencies pulsed UV light was more bactericidal than continuous UV.
Industrial relevance
Pulsed UV light for microbial inactivation has been applied for more than 30years. As a very important factor, pulse frequency has been ignored for a long time. We have demonstrated that at some specific frequencies, pulsed UV light was more bactericidal than continuous UV using low pressure mercury lamp. And if further studies could come to the similar results in inert-gas flash lamps and/or medium-pressure UV lamps and figure out the optimal pulse frequency, it might improve the sterilization efficiency of the existing pulsed UV system.