Possible Applications

< Inadequacies of electric infrastructure in depopulated settlement >
When the photocatalyst receives ultraviolet light on its surface, it shows effects on contaminants such as bacteria and viruses. In developing countries, especially in depopulated settlements, water purification efficiency is somewhat inadequate due to lack of electric infrastructure. However, utilizing ultraviolet rays contained in solar rays which activate the photocatalytic function enables water purification without electricity supply and provision of drinking water.

< Infrastructure maintenance area and urban area >
In the infrastructure maintenance areas and urban areas, we manufacture water purification equipment with photocatalyst using ultraviolet lamp to purify contaminated water efficiently. Water purification equipment will consist of various types of UV source and other mechanical systems, which can be supplied from small-scale settlements in a densely populated areas without excess or deficiency.

In the occurrence of a natural disaster, it is possible to provide safe drinking water as a fresh water generator for disaster recovery.
Other than water purification, Titanystar can be applied for wide variety of purposes. (See Fig. 4)
                                                    Fig. 4 Various purposes of Photocatalyst Titanystar

Competitive Advantage

It is an environment purification technology with high reliability from Japan, and only Titanystar can purify wastewater among commercial photocatalytic products. We have a lot of experiences of installation both in domestic areas and overseas. Moreover, we received “the Best Innovator Award for the Security Water Project of the Defense Technology Symposium 2014” organized by the Ministry of Defense, on 12th November 2014.

As mentioned above, almost all harmful substances can be decomposed and removed. Since reaction takes place only by exposure to ultraviolet rays, large-scale electric power is unnecessary. Ultraviolet rays in sunlight can be available without power.
Since it is a catalyst, water purification reaction can be continued. It has stronger purification performance than chlorine, ozone and hydrogen peroxide. There is no complicated operation like separation membrane. Operating costs are almost unnecessary, only initial costs are needed.
TiO₂ layer in Titanystar has higher durability against physical contact compared to standard TiO₂ coatings, which can be gradually peeled from base materials due to degradation of adhesive properties. Moreover, even if TiO₂ layer in Titanystar have a damage, it can be regenerated by the surface oxidation. (See Fig. 5)

                                   Fig. 5 Difference between Photocatalyst Titanystar and general photocatalyst

Performance

Decomposition of organic matter
Titanystar actually shows stable performance of organic matter decomposition. Fig. 6 shows first and second reaction of the decomposition cycle test. Comparing first with second reaction, there is almost no deterioration in decreasing trend of C/C₀ ratio. (C₀: initial concentration, C: actual concentration)

                                           Fig. 6 Cycle test of decomposition (left: ethanol, right: isopropyl alcohol)

Practical case of water purification
After the introduction of the Photocatalyst Titanystar purification device, there is no generation of general bacteria or legionella bacteria occurring in natural hot springs, and it maintains safety and sanitation.
Fig. 7 illustrates the water circulation diagram including water purification by Titanystar, installed to the hot spring facility in japan.
                                     Fig. 7 The application exmaple of Titanystar (water treatement in an open-air bath)

Technical maturity / Past record of introduction

・Number of sales in Japan
From 2000, cumulative total about 30,000 units or more
・Overseas sales
From 2004, cumulative total of about 2,000 units

Exports to France, UK, Russia, New Zealand, Singapore, Malaysia, India, Taiwan.

Information on patent related to this technology

Japan Patent No.3370290
US Patent No.6344127

Name	Yield Co., Ltd.
Address	998-22 Suenokuchi-cho, Kamigyo-ku, Kyoto, 602-8382 Japan
Capital	3,000,000 yen (as of 13th February, 2019)
Contact person	Mr. Yoshihisa ITOH +81-75-468-1537 E-mail: itoh@yield-kyoto.com
Number of employees	5 (as of 13th February, 2019)
Date of company foundation	3rd April, 2000
Type of business	Manufacture and sale of chemical industrial products

                Corporate website: http://www.yield-kyoto.com/en/

International operation

Number of employees for international operation		N/A
Overseas        offices	City, Country	Name of Company (if applicable)
	N/A	N/A

Modality of business transaction

Direct Investment
The last stage
Based on the results of the first and second stages, we want to invest directly in non-expanding countries and start up business based on our technology from the scratch.

Partnership
First stage
Initially we would like to contract our existing patented technology with existing local companies and start business operations.

Licensing of patent
Second stage
After partnership agreement, we would like to license according to circumstances, to locally producers and expand our business.

Schematic illustration of the technology