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News Release
02.16.2017

Completion of development of ultraviolet treatment equipment for water treatment facilities using ultraviolet light emitting diodes (UV-LED)
- Realizing the world’s first water treatment capacity of 2,000 ㎥/day and long life of approx. 45,000 hours -

As announced in the press release* dated June 20, 2016, METAWATER Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Yasushi Nakamura; hereinafter referred to as “METAWATER”) has been cooperating with Nikkiso Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; President: Toshihiko Kai; hereinafter referred to as “NIKKISO”), a leading company in UV-LED; Nikkiso Giken Co., Ltd. (Headquarters: Hakusan-shi, Ishikawa; President: Tsunehisa Suita; hereinafter referred to as “NIKKISO GIKEN”), a subsidiary of NIKKISO; and Senko Riken K.K. (Headquarters: Kobe-shi, Hyogo; President: Eiichi Tsuga; hereinafter referred to as “Senko Riken”) with extensive records in the delivery of UV treatment equipment for water treatment facilities. As a result of this cooperation, we have facilitated the development of UV treatment equipment for water treatment facilities with the world’s first water treatment capacity of 2,000 m3/day using the world’s top-class, high-power UV-LED. METAWATER is pleased to announce that the development of the equipment has been completed.
In addition to providing a water treatment capacity of 2,000 ㎥/day, the equipment has achieved a life of approx. 45,000 hours, about three times longer than the existing UV mercury vapor lamps. METAWATER will also soon finish the development of a new model with a water treatment capacity of 500 ㎥/day.
Going forward, METAWATER aims to put the equipment on the market in FY2017 after obtaining the “Certification of Ultraviolet Disinfection Unit” from the Japan Water Research Center (JWRC). At the same time, METAWATER will strive to enhance product lineups and accelerate the development of next-generation UV treatment equipment that corresponds to water supply facilities with a treatment capacity of 30,000 ㎥/day, which is equivalent to a population served of 100,000 people, by embodying the energy-saving and long-life characteristics of LEDs.

* Development of ultraviolet irradiation equipment for water treatment facilities using ultraviolet light emitting diodes (UV-LED) (press release dated June 20, 2016)
http://www.metawater.co.jp/eng/news/detail/20160707Koi.html

Characteristics of UV treatment equipment  

  • Realizing the world’s first water treatment capacity of 2,000 ㎥/day using the world’s top-class, high-power UV-LED
  • Providing approx. three times longer life than UV mercury vapor lamps mainly by controlling UV-LED output and optimizing irradiation
  • Reaching the predetermined UV irradiation level instantly by turning on the equipment while allowing the equipment to repeatedly be switched on and off
  • Offering high safety by eliminating the use of mercury and contributing to reducing environmental burdens

Treatment capacity (m3/day) 2,000 First in the world
UV irradiation (mJ/cm2)*1 16.1 Demonstration data
LED standard output (mW/unit) 30 At 100% output
Light source peak wavelength (nm) 285 Half width approx. 10 nm
LED life expectancy (hours) Approx. 45,000 UV mercury vapor lamp: Approx. 14,000 hours*2
Cleaning mechanism - Ultrasonic cleaning
*1: UV irradiation translated at 254 nm     *2: Based on METAWATER data

Background to the development

UV inactivation is one of the ways to control chlorine-resistant pathogenic protozoa including Cryptosporidium in the water treatment process. While UV treatment equipment using mercury vapor lamps is now used generally, there is a global tendency to tighten regulations on mercury emissions. The Minamata Convention on Mercury (the “Minamata Convention”), a global treaty to prevent mercury pollution, was adopted at the Diplomatic Conference of the United Nations Environment Programme (UNEP) held in October 2013. Meanwhile, a cabinet decision was made in Japan to conclude the Minamata Convention in February 2016. Against this backdrop, there is growing interest in safe UV treatment equipment using UV-LED.

Role-sharing in promoting joint development

METAWATER:                        Overall management and sales
NIKKISO, NIKKISO GIKEN:     Design and manufacturing of UV-LED light source module
Senko Riken:                        Design and manufacturing of equipment other than UV-LED light source   module
 
The Environmental Sanitary Engineering Lab. (Professor Naoyuki Kamiko) at the Department of Environmental Systems Engineering in the College of Science and Engineering at Ritsumeikan University provided support in evaluating the UV irradiation performance for the demonstration experiment of the equipment.



UV treatment equipment (experimental device)








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