Ultraviolet disinfection technology advantage and influence factors

by:Tepro     2020-05-07
Uv dosage are the direct factors affect disinfection effect. uv disinfection lamp effect It is equal to the product of uv light intensity and the contact time. Under the condition of the same intensity of uv light, contact time decided to uv dose. In large sewage treatment plant, the quantity is big, the contact time is not guaranteed, so use ultraviolet disinfection efficiency is worse than a small sewage treatment plant. From the theory analysis, uv dose, the greater the disinfection, the better, uv disinfection has a limit, however, more than the limit are not economic effectively for neutralising the extra microbes. A, 1) modern advantage Sterilization with high efficient sterilization efficiency, ultraviolet C function of killing bacteria, viruses, generally within 1 second, the traditional method of chlorine and ozone, ultraviolet bactericidal effect of C need general 20 minutes to 1 hour. 2) Efficient sterilization broad spectrum of ultraviolet C technology in the current disinfection technology, broad spectrum of sterilization is quite high, it for almost all of the bacteria and viruses can efficiently kill, and to some harm is bigger, and the concentration of chlorine and ozone disinfection in water may be difficult to effectively kill within protozoa can effectively kill. 3) No secondary pollution due to ultraviolet C technology does not add any chemicals, so it will not cause secondary pollution in the water body and the surrounding environment, do not change the water any ingredients. And for chlorine disinfection, if the water contains a lot of organic matter, its produce organochlorines have carcinogenic effect to human body, and water containing chlorine compounds in some instances, the water harmful organisms, plants and water environment. 4) Safe and reliable operation of the traditional disinfection technologies such as using chlorine or ozone, the disinfectant belongs to highly toxic, flammable, explosive or corrosive substances, the use of these substances must be especially careful, modern uv disinfection system is a kind of water on the surrounding environment and operation personnel is relatively safe and reliable technology. Second, the factors affecting the effects of ultraviolet disinfection 1. Uv dose if respectively considering uv light intensity and the contact time of disinfection effect, can be found, for different kinds of microorganisms, the influence of both is different. In under the same dose of uv, uv light intensity for e. coli and bacillus influence is bigger, this is because the repair enzyme in cells more sensitive to uv light intensity; For eukaryotic yeast cells, increase the contact time is more advantageous to kill; Microorganisms, such as phage, spores, of course, for more, there is no much point to separate the discussion, the reason may be that the ultraviolet disinfection process in a state of inactivity. So there is no need to determine the minimum contact time and minimum intensity of uv light, the product is the necessary factors affecting ultraviolet disinfection effect. 2. Microbial species and load because of the wastewater in a wide range of bacteria, viruses, and the resistance to uv light is different, so for different types of sewage, presents different disinfection effect. Some microbes are quite sensitive to uv, high removal rate, such as fecal bacteria and some microbes are otherwise, need higher uv doses to kill, such as F - RNA e. coli bacteria, copper green hair. Microbial load is one of the main factors affecting ultraviolet disinfection efficiency, higher requirement of microbial quantity higher uv dose. At present, in the design of uv sterilizer, mainly inactivated TC ( Total coliform) 、FC( Fecal coliform) E。 coli( E. coli and bacterium) Number, streptococcus faecalis and salmonella to estimate uv dose requirements.
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