Advantageous Results-Achieving a high level of sterilization of treatment water by using a physical treatment that does not cause damage to the environment

- Achieving the filtration of a large quantity of raw water in a short time

- Achieving sterilization at a lower cost, as compared with other methods

Possible Industrial Applicability・Sterilizing ballast water of ships, etc.・Pretreatment for obtaining fresh water from seawater・Reducing chlorine and flocculating agent when tap water is produced・Preventing creatures from attaching to a heat exchanger that uses seawater as cooling water

　 　 Filter and filtration method The invention capable of sterilizing a large quantity of water at a high level in a short time through a physical treatment

Background　As a method of sterilizing ballast water of ships or the like, a technique using a chemical process is known. However, a large quantity of ballast water subjected to the chemical process is discharged into the sea, and thus there is a fear that the discharged ballast water will harm marine creatures and a marine ecosystem. Further, sterilizing methods using ultraviolet rays or a photocatalyst have been proposed. However, these methods are not practical since it is difficult to filter a large quantity of water to be treated. Thus, there has been a need to develop a new technology.

Brief Summary of the Invention

This invention is to provide a technique of filtering out plankton and bacteria contained in raw water. In this invention, a filtration vessel includes multiple spring filters, and a filter aid is disposed on the outside of the spring filters to form a precoat layer. Raw water passes through the precoat layer, with the result that plankton and bacteria contained in the raw water are filtered out.

One example of the advantages of this invention is that, according to a culture method, 99.99%-sterilization is achieved in a viable bacteria group (see Figure 1). It has been confirmed that this advantageous result is produced not only from a compact experiment device but also from a relatively large apparatus capable of treating water at about 150 ton/h (see Photo 1).

Title of the Invention Filter and method of filtration (WO2009/028163）Inventor Takeshi SHINODAApplicant Kyushu University, National University Corporation

We are seeking business partners to license this technology.

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The culture methodfor Viable bacterial group

The new TDC methodfor all kind of bacteria

Raw sea water 43,000 3,559,400

The culture method TDC(cfu/mil.) (ind./mil)

Treated water 3.25 22,100Removal rate(Ave.) 99.99% 99.3%

Figure 1: Advantageous result obtained from thefiltration apparatus according to one embodiment of the present invention

Photo ２　Filter unit to be placed in the vessel

Raw water inlet

Outlet of treatment water

Filtration vessel

Pre-coat tank

Electrical switchboardPump unit

Spring filter unit

Classification No.QP070044-PC

Photo１　Filtration apparatus under development 　　　 　(700-filters equipped model)

Contact: Kyushu University Intellectual Property Management Center (IMAQ) Technology Transfer Division Tel: +81 92 642 4361, Fax: +81 92 642 4365 E-mail: transfer@imaq.kyushu-u.ac.jp

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（EN）濾過装置及び濾過方法 .pdf 2012/08/14 9:49:28