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The source of wisdom and life -- the application of deep UV in water purifier

Technology sharing · 2021-05-27 14:31:18

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The potential pollution problem of water purifier itself is often easy to be ignored by people. In fact, bacteria may grow in each filter unit of water purifier, such as ppcotton filter element, carbon rod filter element, pipeline, connector and other parts in the pretreatment and post-treatment system of water purifier, which have no antibacterial function and may breed bacteria; The purified water treated by microfiltration core, super filter element or reverse osmosis membrane filter element may be polluted if it is not stored or used properly. This paper will take reverse osmosis water purifier as the object to elaborate the role of uvc-led in the sterilization of water purifier.


Reverse osmosis water purifier

Bucket type water purifier

The effluent flow of RO membrane is small, and the purified water is stored in the water tank first, and then discharged from the water tank when it is used to meet the water demand


Filter type water purifier

When the effluent flow of RO membrane is large and purified water needs to be used, the water production can be started directly


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Reverse osmosis water purifier can remove heavy metal ions, bacteria, viruses and other harmful substances in water through reverse osmosis RO membrane, but after a period of installation and use, the water purifier may be damagedBacterial contamination, effluentSubstandard situation of microorganisms (total number of colonies, total coliform, etc.)； If the water purifier is not used for a long time, the microbial pollution will be more serious.



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01

Bucket type reverse osmosis water purifier



With a water storage tank, due to the inconvenient disassembly, users seldom clean the water storage tank. After the tap water passes through the reverse osmosis membrane, the residual chlorine in the water is filtered, and the bacteriostatic environment is lost. The breeding bacteria adhere, reproduce and secrete mucus on the surface of the tank in the environment of no active chlorine. With the passage of time, bacteria and mucus continuously accumulate on the surface, Thus, the total number of colonies in purified water exceeded the standard.

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When the water tank was filled with pure water for testing, the total bacterial count in the water tank increased from 5 CFU / ml to 106 CFU / ml after three days of storage, which exceeded the hygienic standard of drinking water. With the passage of time, the total bacterial count will continue to rise.




02

Filter type reverse osmosis water purifier



The purified water from the outlet end of RO membrane to the tap has to pass through the post activated carbon filter and water pipe and other wading materials. The granular activated carbon material can promote the growth of bacteria and aggravate the microbial pollution.

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In an experiment, five prototype 600 g filter ro machines were used for testing. After the machines were placed for 12 hours (simulated overnight), there was no sterilization treatment. The first cup of 500 ml water was picked up after the machine was turned on. It was found that the total bacterial count of three machines exceeded the hygienic standard of drinking water, and the total bacterial count of one prototype exceeded 538 CFU / ml.




UV sterilizationAs a mature technology, it has been used in water treatment industry for a long time

UV sterilization belongs to physical sterilization

It is the use of ultraviolet rays to detect various bacteria, viruses and other microorganisms in waterEfficient inactivation

Prevent bacteria from multiplying in water

To achievepurifyeffect



Traditional UV mercury lamp

Thermal light sourceThere is thermal radiation;

Short life: only about 1000 hours;

Big sizeIt usually exists as long tube;

Low efficiencyThe results show that UVC band ultraviolet light is only a part of the light source, and the energy is wasted seriously;

It's not environmentally friendlyIt contains highly toxic substance mercury;


UVC-LED

Cold light sourceNo thermal radiation and low temperature rise;

Long lifeIt is more than 10 times of the traditional mercury lamp;

Small sizeIt is easy to integrate into various product designs;

Efficient sterilizationBand concentration;

Environmental protection and safetyNo mercury and no ozone;



DUVTekUVC-LEDHighly effective sterilization products

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01

UVC-LEDApplied to bucket typeROmachine

UVC-LEDThere is a radiation angle when the lamp irradiates. The sterilization effect is good in the radiation angle, but it is called radiation blind area outside the radiation angle. The radiation intensity is weak and the sterilization effect is poor.


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DUVTek can provide a variety of product combinations and application methods for the sterilization needs of bucket RO machine. Through the effect comparison test, it can find out the optimal product selection, product arrangement and product fixation methods for users, such as floating, fixed and so on, so as to achieve the best user experience.

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02

UVC-LApplication of ED in filter type RO machine

Instant filterROAfter the machine is started, the filtered water is directly discharged from the tap, and the flowing water must be sterilized in real time by the high light intensity ultraviolet lamp to ensure the effective sterilization of the flowing water.


In order to ensure that the total number of colonies in the first cup of water discharged by the faucet does not exceed the standard, the position of the UV lamp should be as close as possible to the faucet outlet, shorten the distance of non bactericidal waterway, and improve the bactericidal effect.


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Traditional mercury lamp in the filterROIt often appears in the application of the machine, which is inconvenient to install on site; The volume of faucet is too large, the structure size is difficult to match, which affects the overall appearance design; When the lamp is turned on, the peak value can not be reached immediately, and the germicidal effect of flowing water is poor; Frequent start and stop lead to short service life and many other problems.


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Deep violet uvc-led products almost overcome all the above defects of traditional mercury lamp. It can perfectly integrate the inlet and outlet, and achieve efficient sterilization.


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According to the different characteristics of reverse osmosis water purifier, DUVTek uvc-led has different implementation schemes for the prevention and control of potential bacterial breeding, which can better prevent and control the potential bacterial pollution of water purifier.