Application of ultraviolet disinfection in water treatment

One, water treatment disinfection technology types

 

 

 

Water disinfection technology mainly includes ultraviolet disinfection, chemical disinfection, chemical disinfection and chlorine disinfection

 

Chlorine dioxide disinfection, peracetic acid disinfection, ozone disinfection, chloramine disinfection, hydrogen peroxide disinfection, etc.

 

At present, the application of uv system in China's municipal sewage treatment has been launched on a large scale, the use of uv disinfection technology of sewage treatment plants more than 50%

Two, ultraviolet disinfection principle

 

Ultraviolet technology is a rapid, economical and efficient disinfection technology in the 1990s.

 

It is the use of special design of high efficiency, high intensity and long life of the band (110 ~ 280) uv radiation generation device

 

To kill all kinds of bacteria, viruses, parasites, algae and so on in water.

 

The mechanism is that a certain dose of ULTRAVIOLET radiation can damage the structure of biological cells

 

The purpose of purifying water is to kill aquatic organisms by destroying their genetic material.

 

Ultraviolet disinfection is a physical method that does not add anything to the water, has no side effects and does not produce disinfection by-products

 

But lack continuous sterilization ability, want to use with other disinfection method commonly so.

Three, uv disinfection lamp type

 

 

 

At present, ultraviolet disinfection lamps commonly used in sewage ultraviolet disinfection system include:

 

Low pressure low intensity mercury lamp, low pressure high intensity mercury lamp, medium pressure high intensity mercury lamp and deep ULTRAVIOLET LED lamp (UVC LED).

 

The low-voltage lamp system refers to the output power of a single uv lamp in the UV disinfection equipment is 30W-40W.

 

It is mainly used in small water treatment plants or low flow water treatment system applications.

 

Low-voltage and high-intensity lamp system refers to the uv disinfection equipment with a single uv lamp output of about 100W, it is mainly suitable for the application of medium-sized sewage treatment plants.

 

Medium voltage lamp system refers to a single uv lamp output above 420W in the UV disinfection equipment.

 

It is primarily used in large sewage treatment plants and water treatment systems with high suspended solids and low UV penetration (WT).

 

 

 

Ultraviolet LED will be the development trend

 

 

 

(1) Mercury lamp sterilization is currently widely used sterilization method. But because it contains toxic mercury

 

(2) The Minamata Convention has entered into force, and mercury products, such as mercury lamps, will accelerate the phase-out process.

 

(3) UV LED has many advantages in terms of size, weight, energy consumption and service life:

 

1-UV LEDS produce the best wavelengths of light the user needs, whereas traditional light sources produce light at fixed wavelengths

 

The 2-UV LED instantly starts and shuts down without reducing service life, and is safer and easier to use

 

3 - UV LEDS can create new disinfection applications based on potential new designs

 

(4) other advantages of UV disinfection: non-toxic, immediate effect, harmless to the environment and users, no odor, etc.

Iv. Uv disinfection market

 

 

 

The market for UV disinfection/purification systems in the water treatment sector was estimated to be us $942 million in 2017, according to international agencies.

 

At present, about 25% of the industrial and sewage treatment plants in western countries have adopted ultraviolet sterilization technology.

 

In 2003, SARS incident stimulated the popularization and application of ULTRAVIOLET disinfection technology in China's sewage treatment.

 

In addition, China's sewage treatment plant started late, in the construction and development period can fully draw lessons from the successful experience of foreign countries.

 

Experts predict that ultraviolet disinfection technology, as the most advantageous sterilization technology at present, will undoubtedly take the lead in this field.

 

It will become the mainstream technology to replace the traditional chemical disinfection method in the application of urban sewage treatment. It is expected that 50% of all available sewage treatment plants will use UV disinfection,

 

In the meantime contains the business opportunity is very big, so in the disinfection field this technology will have the broad market prospect.