The difference between ultraviolet overflow germicidal lamp and immersion sterilizer

Overcurrent. The working principle of the overflow type equipment is as follows: the water flow at a certain flow rate generated by the pressure generated by the water pump flows through the periphery of the quartz casing that can transmit ultraviolet, and the 254nm ultraviolet rays generated by the ultraviolet lamp disinfect and sterilize the water.

It is characterized by a very fast flow rate of water, generally in the quartz jacket flow time of no more than 1 second, so the ultraviolet intensity of the germicidal lamp is very high, generally required in the surface strength of more than 30000uw cm2. To produce such a high UV intensity, a high-intensity and high-power UV germicidal lamp is used. If you still want to improve the disinfection effect by extending the time, then you generally choose a longer lamp, make a longer device, or treat the stainless steel outer wall into a vortex rotating structure to extend the time the water flows.

Immersion type Compared with the overflow type, the immersion type has a simple structure. The germicidal UV lamp is placed directly in the water, and this method can be used for flowing dynamic water, as well as for static water. This treatment method should be aware that the lamp may rupture due to unexpected circumstances; After long-term treatment, the surface of the lamp will be covered with pollutants such as algae in the water, which will seriously affect the transmission of ultraviolet rays.

To disinfect different water bodies, it is important to understand the changes in water quality and the transmittance of water to ultraviolet rays.

When purchasing an overflow UV sterilizer, users can focus on the following important factors:

1) Treatment water: The design water volume, average flow rate and flow change coefficient all have an important impact on the treatment effect;

2) Ultraviolet lamp customer selection: even if the total effective output power is comparable, the difference in the type and number of lamps has an important impact on the sterilization effect;

3) Water quality indicators: the main indicators include suspended solids concentration, suspended solids particle size, turbidity, UVC transmittance, bacterial content, etc. of raw water;

4) Other factors: including environmental factors (such as temperature and humidity) for equipment use, and other special requirements of users (such as system installation methods, etc.).

The sterilization principle of ultraviolet sterilizer is to use the energy of ultraviolet photons to destroy the DNA structure of various viruses, bacteria and other pathogens in the water body. It is mainly to break various structural bonds in DNA or undergo photochemical polymerization reactions, such as making thymine dimerization in DNA, so that various viruses, bacteria and other pathogenic organisms lose their ability to replicate and reproduce, and achieve the effect of sterilization.

The ultraviolet sterilization wavelength band is mainly between 200 and 300nm, among which the nano wavelength has the strongest sterilization ability. When various bacteria and viruses in water or air pass through the ultraviolet (wavelength) irradiated area, ultraviolet rays penetrate the cell membrane and nucleus of microorganisms, destroy the molecular bonds of nucleic acids (DNA or RNA), make them lose their ability to replicate or lose their activity and die, thus killing all bacteria and viruses in water or air without using any chemical drugs.

Ultraviolet disinfection technology is the latest generation of disinfection technology that emerged in the late 90s in the world. It integrates optics, microbiology, electronics, fluid mechanics and aerodynamics, and has the characteristics of high efficiency, broad spectrum, low cost, long life, large water volume and no secondary pollution, and is internationally recognized as the mainstream disinfection technology in the 21st century.

Typical embedded (berson''in-pipe''The UV disinfection system contains a UV code-based lamp and a quartz sleeve. This UV lamp is fixed in a quartz sleeve, and then the entire sleeve is fixed to a columnar stainless steel reaction chamber edge. This is designed so that the water to be treated begins to be treated at the same time as it enters the reactor from one end, and the entire disinfection process will accompany the water flow to the other end of the reactor.

Depending on the pressure, UV lamps can be divided into two categories: low-pressure UV lamps and medium-pressure UV lamps. Low-pressure UV lamps output a single UV (limited to a single wavelength of 254 nm), while medium-pressure UV lamps output multi-color UV light (wavelengths between 185 and 400 nm).

Overflow ultraviolet light is usually the water through the stainless steel 304 reactor one in and one outlet, the ultraviolet lamp is installed in the stainless steel reactor, sterilization, only the section of the water is sterilized, after treatment, no bacteria; However, bacterial contamination cannot be treated in the back-up system, so it is usually used at the end of the system.