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What are the characteristics of the ultraviolet sterilizer, and what is its working principle?


The principle of ultraviolet sterilizer is generally believed that the diacid in the organism absorbs the energy of ultraviolet light and changes its own structure, thereby destroying the function of nucleic acid. When the energy absorbed by the nucleic acid reaches a lethal amount and the ultraviolet light can be kept for a certain period of time, the bacteria will die in large numbers. The sterilizing effect of ultraviolet light varies with the wavelength. The ultraviolet light with a wavelength between 200-300nm has a sterilizing effect, and the 254-257nm band has the best sterilizing effect.

This is because the ultraviolet absorption peak of deoxyribonucleic acid (DNA) nucleoprotein in bacteria is exactly between 254-257nm. If the sterilizing ability of ultraviolet light in this band is set as 100%, then compare it with the sterilizing ability of ultraviolet light in other wavelengths. Ultraviolet rays exceeding or below 254-257nm, with the increase or decrease of wavelength, the sterilization effect will drop sharply.

Features of Ultraviolet Sterilizer 1. Ultraviolet sterilization is fast, efficient and effective. 2. Ultraviolet radiation will not change the physical and chemical properties of water, and will not bring pollution caused by additives to pure water. 3. It is suitable for various water flow rates. It is easy to operate and convenient to use. It only needs to clean the quartz glass sleeve regularly and replace the lamp tube.

4. Small size, light weight, low power consumption. 5. Ultraviolet sterilization has no continuous disinfection effect and is susceptible to secondary pollution. Ultraviolet sterilization has significant advantages over other commonly used sterilization methods (such as heating, chlorination and filter sterilization, etc.). High temperature, high equipment cost, high heat consumption, long sterilization time, complicated equipment operation and maintenance.

The chlorination method is generally used for the disinfection of urban domestic water. It is not suitable for use when the water quality is high. At the same time, the transportation, storage, and dosing of liquid chlorine are troublesome, and the sterilization time is also long (generally, the contact time is not less than 30min. ). The operation cost of filtration sterilization is high, and the filter mesh is easy to be blocked, so ultraviolet sterilization is widely used in water purification process. The electrical facilities of the ultraviolet sterilizer device include power display, voltage indicator, lamp indicator, accident alarm, quartz timer and switch, etc. The quality requirements for the ultraviolet sterilizer are mainly to ensure a sterilization rate of 99.9%.

The intensity, spectral wavelength and irradiation time of ultraviolet rays are the factors that determine the sterilization effect of ultraviolet rays. The ultraviolet ray with a wavelength of 2537Å has the strongest bactericidal ability, so the energy of the radiation spectrum of the ultraviolet lamp used for sterilization is required to be concentrated at around 2537Å to achieve the best bactericidal effect. Factors affecting the sterilization effect The installation position of the ultraviolet sterilizer The closer to the point of use, the better, because the dead bacteria pollute the pure water, so a filter should be installed behind the ultraviolet sterilizer, and the filter membrane pore size is generally required to be ≤0.45μm.

Flow rate When the radiation energy of ultraviolet rays is constant, the water flow rate has a significant impact on the sterilization effect. The larger the flow rate and the faster the flow rate, the shorter the time of being irradiated by ultraviolet rays; the shorter the time of bacteria being irradiated, the lower the probability of being sterilized. If the flow rate remains unchanged, when the microbial contamination level in the source water is high, the removal rate of the contaminated bacteria is also high, but the pass rate of the bacterial inspection in the effluent water may decrease. Water Inlet Requirements The chromaticity, turbidity, and total iron content of water all absorb ultraviolet light to varying degrees, resulting in reduced bactericidal effect.

Chromaticity has the greatest impact on UV transmittance, followed by turbidity, and iron ions also have a certain impact. The water quality requirements of ultraviolet sterilizers are generally: chromaticity<15. Turbidity<5. Total iron content<0.3mg/L, bacteria content ≤900/ml. Water layer thickness The thickness of the water layer has a great relationship with the ultraviolet bactericidal effect.

For example, for a pipeline with a water flow rate of no more than 250L/h, when a 30W low-pressure mercury lamp is used to sterilize a 1cm thick water layer, the sterilization efficiency can reach 90%; the sterilization efficiency for a 2cm thick water layer is 73 %; The sterilization efficiency for a 3cm thick water layer is 56%; for a 4cm thick water layer, it drops to 40%. Therefore, under the above-mentioned flow rate conditions, the thickness of the effective ultraviolet sterilizing water layer is not more than 2.2cm. If the water contains spore bacteria, the thickness of the water layer should be reduced to 1.4cm, and the flow rate of the water should be reduced to 90L/h.

If the water contains mud, sand and dirt, the effective water layer thickness should also decrease, and the water flow velocity should also decrease. Otherwise, the expected sterilization effect cannot be achieved. Quartz sleeve The quality and wall thickness of the quartz sleeve are related to the transmittance of ultraviolet rays. The purity of the quartz material is high, and the performance of transmitting ultraviolet rays is good.

During use, the casing should be pulled out regularly and wiped with absolute ethanol to keep the quartz casing clean. Typically, the frequency of cleaning is at least once a year. It is best to run the ultraviolet germicidal lamp continuously for a long time. Before sterilization, it should be preheated for 10-30 minutes.

The number of times the lamp is turned on and off should be reduced as much as possible. Every time the lamp is switched on and off, the service life of the lamp will be reduced by 3 hours. In addition, the network voltage is required to be stable, and the fluctuation range shall not exceed 5% of the rated voltage, otherwise a voltage stabilizer shall be installed. Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..

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