Top Page > Press Release 2023 > MOL Project to Produce Pure Water for Hydrogen Generation Selected for Shiga Prefecture Subsidy Program - Advancing Wind Hunter Project Harnessing Offshore Wind to Produce Hydrogen for Vessel Propulsion -

MOL Project to Produce Pure Water for Hydrogen Generation Selected for Shiga Prefecture Subsidy Program
- Advancing Wind Hunter Project Harnessing Offshore Wind to Produce Hydrogen for Vessel Propulsion -

August 03, 2023

TOKYO-Mitsui O.S.K. Lines, Ltd. (MOL; President & CEO: Takeshi Hashimoto) today announced that its initiative to develop a pure water production system for hydrogen generation, proposed jointly by Kyushu University Professor Takeshi Shinoda and Taiyo Sangyo Co., Ltd. (President: Yoshinobu Odagaki; Hikone-shi, Shiga Prefecture) has been selected for a Shiga Prefecture-backed project to promote social implementation of near-future technologies (Note 1).

[How the purified water production system works]

MOL is promoting the Wind Hunter Project (Note 2), which harnesses offshore wind energy to produce hydrogen from water onboard and convert it into propulsion for vessels, to realize a decarbonized, hydrogen-based society. However, hydrogen production requires a higher level of water purity, even more than drinking water. During the Wind Hunter hydrogen production process, seawater is first purified by passing it through a filter to remove impurities such as organic matter (carbon content, microplastics, etc.), inorganic matter (iron, magnesium, sodium), and sludge, but the filters currently in common use require frequent replacement, which increases the workload of crewmembers and imposes a significant cost burden.

Zero Emission Ship 'Wind Hunter Project'
(Click the above to watch the concept video)

In this development, the three parties will play the following roles to develop long-lasting, durable, and high-performance filters that will be able to remove even bacteria, which will require even more advanced technology in the future, and to manufacture a pure water production system.

<Roles of each participant>
MOL: Project management, market research, and provision of expertise in marine system design
Kyushu University: Designing demonstration test of pure water production system, development and application of high-performance filter (Note 3)
Taiyo Sangyo: Development and application of a reverse osmosis (RO) system (Note 4)

The development of more efficient onboard technology to produce pure water from seawater in the Wind Hunter project will mark a major step toward the realization of large zero-emission ships.

In this project, a pure water production system will be designed not only for seawater but also for fresh water through a demonstration test in Lake Biwa in Shiga Prefecture. MOL will assess the effects of differences in water quality and establish a versatile pure water production technology by comparing seawater with fresh water from Lake Biwa, the largest lake in Japan. It will not only create pure water production technology for the Wind Hunter project, but also apply the developed technology to supply pure water to hydrogen production plant and other applications.

MOL set a target of achieving net zero greenhouse gas (GHG) emissions for the entire MOL Group by 2050 in the "MOL Group Environmental Vision 2.2," It will contribute to the reduction of GHG emissions and the realization of a decarbonized society, not only by reducing its own GHG emissions, but also by actively participating in this project and others to build a clean energy supply chain.

(Note 1) Please refer to the following website for details. Automatic translation service is available.
Subsidies for promoting social implementation of near-future technologies in Shiga Prefecture

(Note 2) Please refer to the following for details of the "Wind Hunter Project."
[MOL website] BLUE ACTION 004WIND HUNTER - Shape the future with wind and hydrogen.
[Press releases]
November 20, 2020, press release: "Wind Hunter Project" Starts -Zero-Emission Project with Wind Propulsion and Hydrogen-
December 9, 2021, press release: "Wind Hunter Project" Zero Emission Ship Sailing by Wind and Hydrogen succeeded in the demonstration experiment by the Yacht "WINZ MARU"

(Note 3) High-precision seawater filtration system developed by Professor Takeshi Shinoda, Department of Marine Systems Engineering, Faculty of Engineering, Kyushu University

(Note 4) RO stands for "reverse osmosis." This system uses a membrane that allows water to pass through but does not allow impurities other than water, such as ions and salts, to permeate.

MOL Group 5 Sustainability Issues
MOL Group identifies "Sustainability Issues" (Materiality) as our key issues for sustainable growth with society through realization of the Group Vision.
We anticipate this initiative to contribute especially to the realization of "Safety & Value -Provide added value through safe transportation and our social infrastructure business-", "Environment -Conservation for Marine and global environment-," "Human & Community -Contributing to the growth and development of people and communities-," and Innovation -Innovation for development in marine technology-."

MOL to sponsor Japan Association for the 2025 World Exposition and exhibit the "Wind Hunter Project"