Kyowakiden Industry Co.

Nagasaki-shi, Japan

Kyowakiden Industry Co.

Nagasaki-shi, Japan

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Nakano Y.,Nagasaki University | Akamatsu N.,Nagasaki University | Mori T.,Nagasaki University | Mori T.,University of Miyazaki | And 13 more authors.
PLoS ONE | Year: 2016

Removal of pathogenic organisms from reprocessed surgical instruments is essential to prevent iatrogenic infections. Some bacteria can make persistent biofilms on medical devices. Contamination of non-disposable equipment with prions also represents a serious risk to surgical patients. Efficient disinfection of prions from endoscopes and other instruments such as high-resolution cameras remains problematic because these instruments do not tolerate aggressive chemical or heat treatments. Herein, we develop a new washing system that uses both the alkaline and acidic water produced by electrolysis. Electrolyzed acidic water, containing HCl and HOCl as active substances, has been reported to be an effective disinfectant. A 0.15% NaCl solution was electrolyzed and used immediately to wash bio-contaminated stainless steel model systems with alkaline water (pH 11.9) with sonication, and then with acidic water (pH 2.7) without sonication. Two bacterial species (Staphylococcus aureus and Pseudomonas aeruginosa) and a fungus (Candida albicans) were effectively removed or inactivated by the washing process. In addition, this process effectively removed or inactivated prions from the stainless steel surfaces. This washing system will be potentially useful for the disinfection of clinical devices such as neuroendoscopes because electrolyzed water is gentle to both patients and equipment and is environmentally sound. © 2016 Nakano et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Sakai H.,Kyowakiden Industry Co. | Ueyama T.,Kyowakiden Industry Co. | Irie M.,Kyowakiden Industry Co. | Matsuyama K.,Kyowakiden Industry Co. | And 3 more authors.
Desalination | Year: 2016

Sea water reverse osmosis (SWRO) would face some problems like energy saving and management of concentrated brine. To solve these problems at the same time, the energy recovery by Pressure Retarded Osmosis (PRO) was proposed in the Mega-ton Water System project. Prototype plant test was conducted using concentrated brine from SWRO plant and fresh water from regional waste water treatment facility. Hollow-fiber membrane module were examined in the prototype plant and the test operation was carried out for more than one year. We have reached the maximum membrane power density, 13.5W/m2, using 10-in. module. Followings were still existing obstacles for further effective PRO. It was also challenging how to get clean fresh water from waste or river water without additional cost. Innovative new technologies were also required to address these concerns. We have also estimated plant cost and surveyed financial impacts on the energy saving of SWRO operation, based on the situation of currently operated SWRO plants worldwide, especially about the Mega-ton scale ones. Those studies indicated that potential market of PRO was 1-2GW, and 10% energy saving was possible on the Megaton scale SWRO plants. Those results indicate that the commercialization plant would be available very near future. © 2016 Elsevier B.V.


Kurihara M.,Toray Industries Inc | Sakai H.,Kyowakiden Industry Co. | Tanioka A.,Tokyo Institute of Technology | Tomioka H.,Toray Industries Inc
Desalination and Water Treatment | Year: 2016

Reverse osmosis (RO) membranes have been widely applied to seawater desalination and wastewater reclamation, and many large RO plants (>100,000 m3/d) have been constructed since 2000. Energy efficiency is indispensable for large plants, especially for future mega-ton scale seawater reverse osmosis (SWRO) plant (1,000,000 m3/d). In order to reduce energy demand in RO operation, high-efficient low-pressure RO membrane, energy recovery device (ERD), and pressure-retarded osmosis (PRO) which would recover power from salinity gradient between freshwater and concentrated brine were studied in the “Mega-ton Water System” project. A PRO hollow fiber membrane module was newly developed, and a practical continuous operation has been examined at a prototype plant for one year. The maximum 13.5 W/m2 of membrane power density using 10-inch module was established at our prototype PRO plant. As the results of the plant cost estimation and the financial impacts on the energy saving operation at the mega-ton scale SWRO plants, not only 20% energy reduction by the high-efficient low-pressure RO membrane and the ERD but also further 10% energy saving was possible by using the PRO system. © 2016 Balaban Desalination Publications. All rights reserved.


Saito K.,Tokyo Institute of Technology | Irie M.,Kyowakiden Industry Co. | Zaitsu S.,Kyowakiden Industry Co. | Sakai H.,Kyowakiden Industry Co. | And 2 more authors.
Desalination and Water Treatment | Year: 2012

Salinity power generation using hollow fiber modules was examined using the pressureretarded osmosis (PRO) system between pure water and concentrated brine. Pure water and concentrated brine were supplied from a regional sewage treatment facility and sea water desalination (sea water reverse osmosis [SWRO]) plant. To minimize the effect of the concentration polarization near the membrane surface on the pure water side, the number of open ports in the module was increased from 3 to 4 and that modification was found to be effective because non-permeating pure water, which left the module through fourth port, flushed leaked salt from the brine side through the membrane. Our prototype PRO plant got the maximum output power density, 7.7 W/m2 at a 2.5 MPa hydraulic pressure difference and a 38% permeation of pure water into the brine. To remove the organic foulant in the pure water, a low pressure Reverse Osmosis (RO) membrane and coagulation-sedimentation method with ozonation showed good results. However, the pressure drop across the RO membrane itself and cost concerns have not yet been solved. Based on the pure water's flow simulation, the hollow fiber element was found not to effectively work if the module and element for the SWRO were used without modification because the flow pattern of pure water and brine inside the module and element during the PRO operation was different from that during the RO operation. © 2012 Desalination Publications. All rights reserved.


Koyanagi K.,Nagasaki University | Hayashi H.,Nagasaki University | Irie M.,Kyowakiden Industry Co. | Zaitsu S.,Kyowakiden Industry Co. | Sakai H.,Kyowakiden Industry Co.
2012 International Conference on Renewable Energy Research and Applications, ICRERA 2012 | Year: 2012

The flow simulation of the membrane module of PRO, the following results obtained. 1. There is distorted flow in a module. 2. Amount of osmosis is different in a module. At the fresh water collects the amount of osmosis is rapidly decrease. 3. Amount of osmosis in hollow fiber area is about ten percent of the whole. © 2012 IEEE.


Patent
Kyowakiden Industry Co. | Date: 2011-06-24

It is an object of the present invention to provide a hollow fiber forward osmosis membrane, which can enhance forward osmotic pressure energy acquired by permeation, and thus improve power generation efficiency in the forward osmotic pressure power generation, when dilution water such as freshwater permeates into seawater through the osmosis membrane. The relationship between optimal conditions for an inner diameter d and a length L of the hollow fiber osmosis membrane to be used for forward osmotic pressure power generation whereby dilution water such as fresh water is caused to permeate into non-concentrate seawater through the hollow fiber osmosis membrane to increase a flow rate on the side of the seawater using forward osmotic pressure energy thus generated, and power is generated using the increased flow rate, is expressed as equation (1) in the range of d=50 to 200 m, L=0.5 to 2 m and J=1.710^(7 )to 5.110^(7 )m/sec, [Equation 11] wherein J means permeation flux rate.


Patent
Kyowakiden Industry Co. | Date: 2014-01-29

A salt water desalination equipment that can reduce a load on a salt water supply pump and a power consumption thereof is provided. A salt water desalination equipment includes a salt water supply unit that supplies salt water to a reverse osmosis membrane component, a forward osmosis membrane component to which concentrated salt water discharged from the reverse osmosis membrane component is supplied; and an assisting device to which a mixed water discharged from the forward osmosis membrane component is supplied and which is also connected to the salt water supply unit. The assisting device increases at least one of an electric power supplied to the salt water supply unit, a pressure given to the salt water supply unit, and rotation capacity to the salt water supply unit.


Patent
Kyowakiden Industry Co. | Date: 2016-02-10

A salt water desalination equipment that can reduce a load on a salt water supply pump and a power consumption thereof is provided. [Solution] A salt water desalination equipment (1) includes a salt water supply unit (2) that supplies salt water to a reverse osmosis membrane component (3), a forward osmosis membrane component (4) to which concentrated salt water (51) discharged from the reverse osmosis membrane component (3) is supplied; and an assisting device (5) to which a mixed water (52) discharged from the forward osmosis membrane component (4) is supplied and which is also connected to the salt water supply unit (2). The assisting device (5) increases at least one of an electric power supplied to the salt water supply unit (2), a pressure given to the salt water supply unit, and rotation capacity to the salt water supply unit.


Patent
Kyowakiden Industry Co. | Date: 2013-05-01

It is an object of the present invention to provide a hollow fiber forward osmosis membrane, which can enhance forward osmotic pressure energy acquired by permeation, and thus improve power generation efficiency in the forward osmotic pressure power generation, when dilution water such as freshwater permeates into seawater through the osmosis membrane. The relationship between optimal conditions for an inner diameter d and a length L of the hollow fiber osmosis membrane to be used for forward osmotic pressure power generation whereby dilution water such as fresh water is caused to permeate into non-concentrate seawater through the hollow fiber osmosis membrane to increase a flow rate on the side of the seawater using forward osmotic pressure energy thus generated, and power is generated using the increased flow rate, is expressed as equation (1) in the range of d = 50 to 200 m, L = 0.5 to 2 m and J = 1.7 10^(-7) to 5.1 10^(-7) m/sec, whereinJ means permeation flux rate.

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