Test facility Microplastic collection device capable of continuously collecting microplastics while a vessel is underway

Mitsui OSK Lines, Ltd. and Miura Co., Ltd. announced the development of a new centrifugal-type microplastic (PM) collection device, which can continuously collect PM while a vessel is underway, leveraging their technology and knowledge of a collection from earlier MP device (Note 1) which they co-developed. The new device was installed on the EMERALD ACE car carrier operated by MOL last month for a demonstration test.

[Background and achievements]
In order to capture PM, a source of ocean pollution, MOL and Miura have developed a device for capturing PM captured and trapped in a backwash filter, which constitutes the ballast water treatment system, and installed it out of a total of five ships-three bulk carriers and two woodchip carriers.
While these vessels were in offloading ports, the systems treated a total of approximately 16,000 m3 of seawater. The development of this new model was aimed at further increasing treatment times, area and capacity .

[Characteristics of the new centrifugal-type MP collection device]
The addition of a centrifuge allows the device to efficiently separate floating microplastics (PM) from concentrated seawater with a high density of floating debris, without closed plumbing. This allows it to treat the seawater pipe, which continuously draws in seawater, and even treat all of the discharged water after it passes through the filter with the backwash function of the treatment system. ballast water, which was limited to part of the treatment in the previous device. On EMERALD ACE, PM can be collected continuously while sailing, by connecting the system to the cooling seawater line, which always draws in seawater. 70 times more sea water than the previous device. As car transporters operate worldwide (bottom right figure), the ship contributes to the preservation of the marine environment by cleaning all sea areas while operating this device.

[Future development]
Today, the demand for data regarding the amount of floating microplastics in seawater is increasing among research institutes, as these data can be applied to research on PM movement and to measure the effects of various approaches. MP reduction. MOL considers data such as components, quantities, locations and periods of PM collected with the device for future research.
Miura continues to develop the product, which has a larger treatment capacity, and a complete ballast discharge water treatment system by combining a ballast water treatment system and a PM collection and cooling device. sea ​​water.

[MOL’s initiatives on marine environmental conservation]
The MOL group specifies the social issues to be prioritized within the scope of its activity as “sustainability issues” (Note 2). The group contributes to the “Conservation of the marine and global environment”, which is designated as one of the sustainability issues, by reducing PM in the seas around the world.

[Miura’s initiatives on marine environmental conservation]
Miura contributes to the conservation of the global marine environment through the development of its PM collection device, and contributes to the creation of an environmentally friendly society and the realization of a sustainable society, through its business activities as the best partner for heat, water and the environment.
Source: Mitsui OSK Lines, Ltd.

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