Sewage UV disinfection system
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Category:Industrial automation control
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- Release date:2024/07/09
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The disinfection principle of ultraviolet radiation
Ultraviolet disinfection technology uses ultraviolet light to irradiate microorganisms in water, and disinfects the water by inactivating the microorganisms through ultraviolet light. This article provides a detailed introduction to the principle of ultraviolet disinfection, the main types of ultraviolet disinfection systems, the main design parameters and selection criteria of ultraviolet disinfection systems.
Ultraviolet disinfection is the use of the inactivation mechanism of ultraviolet radiation on microorganisms to achieve the goal of purifying water quality. Ultraviolet light refers to electromagnetic waves with wavelengths between 100 and 400 nanometers, and ultraviolet light is invisible light. According to different wavelengths, it can be further divided into UV A (315-400nm), UV B (280-315nm), UV C (200-280nm), and UV D (100-200nm). UV C is capable of efficiently destroying the DNA structure of living organisms and achieving bactericidal and disinfection effects. This is because UV C can be well absorbed by the genetic material DNA and RNA of microorganisms. When sufficient UV energy is absorbed by the DNA and RNA inside microorganisms, their internal nucleic acid chains (pyrimidines) are broken and rearranged to form thymidine dimers, preventing the replication of DNA and RNA, and rendering microorganisms inactive for their own replication and regeneration. This is the disinfection principle of ultraviolet radiation - the inactivation principle.
application
The open channel municipal sewage ultraviolet disinfection system is based on the research results of Xuelaite. It adopts a modular design, and the size and dosage of the module are customized according to the treatment volume and water quality. The disinfection module is placed in the disinfection water channel, along with other components on the shore and PLC control units, to form the disinfection system.
The UV disinfection system generally consists of seven parts: ① UV lamp module; ② Junction box; ③ Ballast control cabinet; ④ PLC main control cabinet (human-machine interface box); ⑤ Pneumatic devices and air compressors; ⑥ Lifting device; ⑦ Overflow weir and related auxiliary accessories, etc.
Technical characteristics
1、 The effective dose of ultraviolet radiation in the system is not less than 30 mJ/cm2, and the effluent meets the national first-class B standard;
2、 The ultraviolet lamp adopts low-pressure and high-energy solid-state mercury alloy technology, and the lamp tube can withstand high load power, with a maximum power density of over 2W/cm and a service life of 12000 hours;
3、 The PLC control center has many functions such as operation interface, module working status monitoring, alarm emergency stop system, data acquisition system, online monitoring, manual/automatic cleaning control, etc;
4、 The quartz casing is made of high-purity quartz, with a thickness of 1.5mm and a transmittance of over 90%;
5、 The disinfection equipment adopts a fully automatic mechanical cleaning device and is equipped with a water level automatic control barrier door;
6、 The system is equipped with ultraviolet monitoring probes. The probe adopts a specially designed filter for 254nm ultraviolet light transmission, and transmits the data of ultraviolet intensity changes in the channel to the central control cabinet;
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