Several factors affecting the bactericidal effect of ultraviolet light
Through research and exploration ultraviolet disinfection effect of several factors, we found that application advantages Guangdong Star Pu-power high-intensity ultraviolet UV lamp is very practical.
UV dose
UV dose is an important indicator to measure the ultraviolet disinfection disinfection process, usually UV dosage = Intensity (mw / cm2) x Time (s) is calculated. The higher the UV dose, the better sterilization. UV disinfection but there is a certain limit, it can not exceed the limit for additional cost-effectively kill microorganisms. UV disinfection usual dose is 30 ~ 45 mJ / cm2. Under normal circumstances, the main consideration of the effects of UV dose effects effects, considering the effects of UV light intensity and exposure time for disinfecting effect can be found, for different kinds of microorganisms, the impact of both is different. Studies have shown that UV doses under the same circumstances, would achieve better inactivation of high UV intensity. For eukaryotic yeast cells, the contact time is more conducive to sterilization.
Water quality parameters - particle size distribution
Particle size distribution on the efficiency of UV disinfection. Size <10um particle, the easier penetration of ultraviolet light, UV dose required for sterilization is low; in 10 ~ 40um particle size between the ultraviolet light can penetrate the chant, the relative increase in ultraviolet demand; and the size of> 40 um the particle is difficult to penetrate by ultraviolet light, ultraviolet high demand. Therefore, the secondary effluent filtration operation, can remove large particles to increase the penetration of ultraviolet rays, thereby increasing the efficiency of disinfection.
Photoreactivation
UV disinfection is a physical disinfection technique moment. After After leaving the treated sewage disinfection reactor, some of the microorganisms in visible light, the light in the resurrection of the body enzymes, connected together to form a monomer dimer depolymerization, thus restoring its ability to replicate, this light phenomenon called resurrection. Some bacteria in the absence of light, but also for self-repair, namely dark resurrection. According to current findings, the resurrection of light is the main way most microbial remediation, as well as the main control objectives. UV disinfectant can increase the amount of emissions control conditions, and other chemical disinfection inhibited joint photoreactivation phenomenon.
