By Lorraine | 07 July 2020 | 0 Comments
How to choose the right ultraviolet sterilizer
First of all, we must know that in a circulating water system, the ultraviolet input power, the circulating water flow rate, and the water's UV254 transmittance are the three important factors that affect the ultraviolet sterilization effect. The greater the UV power per unit of water, the better the sterilization effect; the greater the flow rate of the water through the UV lamp sterilizer, the greater the total sterilization effect; the greater the UV254 transmittance, the better the sterilization effect.
1. Water flow
Under the condition of a certain ultraviolet dose, bacteria, viruses, algae and other microorganisms will be destroyed when the ultraviolet light is exposed to the corresponding time for the corresponding time. The factor that affects the exposure time of microorganisms and ultraviolet rays is the water flow rate. The larger the flow rate, the shorter the exposure time, the smaller the flow rate, and the longer the exposure time. Different flow rates require different ultraviolet power for disinfection to meet the qualified standards. Therefore, when selecting the ultraviolet sterilizer, it should be selected according to the water flow rate, and generally, it should meet the disinfection requirements of the peak flow rate.2. Water quality characteristics
The characteristics of water quality are mainly related to the penetration rate of ultraviolet (UVT). The UVT of water determines the degree of penetration of ultraviolet into water. Pathogens in water need to be exposed to sufficient short-wave ultraviolet to be completely inactivated. Use quartz test tubes to collect water samples, and then let the 254 nm wavelength ultraviolet pass through the water sample to determine the UVT of the water. The percentage of ultraviolet light that passes through the sample is called the "UVT" of the sample. The commonly used test tube has a path length of 10 mm, in which case the UVT reading is referred to as the "T10" reading. Biochemical oxygen demand (BOD), chemical oxygen demand (COD), turbidity (turbidity), and total suspended solids (TSS) in water are all factors that affect UVT. When TSS exceeds 50 mg/L, there will be a so-called "shielding" phenomenon; the solid particles suspended in the water play a "shielding" effect on the pathogen so that the short-wave ultraviolet rays cannot reach the pathogen. Customers should understand the characteristics of water quality and choose the ultraviolet sterilizer with suitable production power and product material.
3. Processing standards
Different treatment standards require different UV doses, that is, different powers. The disinfection requirements for drinking water and food factory water and domestic water are relatively high. Other water requirements, such as swimming pools and landscapes, are slightly lower. Sewage disinfection also needs to be carried out in accordance with relevant discharge standards.The appropriate ultraviolet sterilizer can be selected according to the above reference elements. After providing the manufacturer with parameters such as flow rate, processing standard, and pipe diameter, the manufacturer will provide the corresponding product selection.
Leave a Reply
Your email address will not be published.Required fields are marked. *