Water disinfection with UV-C technology

Offering safe water
to the world

It is said that there are only nine countries in the world where tap water can be drank straight from the faucet. UV-C disinfection is expected to increase in use in the near future as a technology that can deliver safe and secure water to everyone in the world.

Single-pass type (running water disinfection)

Disinfection products for running water

Water storage type

Disinfection products for stored water

Basic structure of water disinfection

There are two types of water disinfection; a single-pass type that irradiates ultraviolet to disinfect running water such as a household water purification system, and a water storage type that irradiates and disinfects water inside a water storage tank such as a humidifier.

Light source	Single-pass type (running water disinfection)	Water storage type
UV-CCL UV-LED
Applications	Water dispenser, household water purification system, small-scale water system, water treatment plant, etc.	Humidifier, emergency tank, etc.
Advantages	Can produce drinking water in a single-pass. Reduces maintenance of filters.	Can disinfect microorganisms such as bacteria that breed inside water storage tanks to keep the water clean.

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Irradiation simulation

Stanley Electric simulates reactor's disinfection to optimize its efficiency (the size, light source type and quantity, etc.) and rectify the reactor's water flow inside, based on the customer's running water conditions.
We also offers optimized disinfection driving conditions to prolong the life of the reactor and to save energy.

Achieving a uniform flow rate that
reduces water speed using a flow rectification mechanism

Water flow has been rectified. (Vector direction and color)

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Effective irradiation of UV-C light using light distribution technology
developed for automotive headlamps

Light distribution to ensure light from the LED hits no part of the pipe wall except the reflector.
(Distribution of light strength)

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Disinfection effect

The required dose varies depending on the type of bacteria and virus to be disinfected. To disinfect 99.9% of E.coli phage T1, the required dose is 12.9 mJ/㎠ (based on test results at Stanley Electric).

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Fig.1: Dose required for 99.9% of disinfection

The greater the flow rate, the more light sources (LEDs) are required inside the reactor. For a flow rate of 2 liters, the required dose of 12.9 mJ/ can be obtained as long as the reactor has two or more LEDs (★1). For a flow rate of 6 liters, four or more LEDs are required (★2).

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Fig.2: Graph showing performance by number of light sources