Showing papers by "Fujiwara Naoki published in 2016"

Circulation water treatment system of cooling tower

Abstract: PROBLEM TO BE SOLVED: To provide a circulation water treatment system of a cooling tower capable of efficiently removing fouling causative substances.SOLUTION: The circulation water treatment system of a cooling tower according to the present invention is equipped with an open type cooling tower for cooling a circulation water for cooling a device to be cooled and supplying cooled circulation water to the device to be cooled, a circulation line for circulating the circulation water between the cooling tower and the device to be cooled, an adsorption device for adsorbing and removing fouling causative substances contained in the circulation water, an adsorption line for supplying the circulation water to the adsorption device, a membrane filtration device for separating the adsorption treated water obtained by removing fouling causative substances contained in the circulation water supplied from the adsorption line by the adsorption device into concentrated water and filtration treated water and a treated water supply line for supplying the filtration treated water from the membrane filtration device to the circulation line. The adsorption device is a hydrophilic polymer adsorbent to which chemical adsorptive functional group is introduced, has swelling degree in 25°C water of 20 to 400% and is equipped with a hydrophilic polymer adsorbent excellent in adhesiveness of the fouling causative substances in the circulation water.SELECTED DRAWING: Figure 1

Method for producing low-salt soy sauce

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing low-salt soy sauce by using an ion exchange membrane which has sufficient ion exchange performance and durability and is hardly deteriorated in ion exchange performance even if an electrodialyzer is operated for a long timeSOLUTION: There is provided a method for producing low-salt soy sauce by reducing the salt content in soy sauce by electrodialysis, wherein the electrodialysis is carried out by using an ion exchange membrane including a copolymer (P) comprising a vinyl alcohol-based polymer component (A), a vinylene-based polymer component (B) and a polymer component (C) having an ionic group as constituent components as a cation exchange membrane and/or an anion exchange membraneSELECTED DRAWING: Figure 3

Method for treating organic wastewater

Abstract: PROBLEM TO BE SOLVED: To provide a method for treating organic wastewater by using an ion exchange membrane having sufficient ion exchange performance and durability, which can remove salts and organic substances contained in organic wastewater by electrodialysis treatment efficiently and stably for a long period of time.SOLUTION: There is provided a method for treating organic wastewater which comprises: a step of subjecting organic wastewater containing salts and organic substances to SS removing treatment; and a step of performing an electrodialysis treatment for organic wastewater after the SS removing treatment, wherein the electrodialysis treatment is carried out using an ion exchange membrane including a copolymer (P) comprising a vinyl alcohol-based polymer component (A), a vinylene-based polymer component (B) and a polymer component (C) having an ionic group as constituent components as a cation exchange membrane and/or an anion exchange membrane.SELECTED DRAWING: Figure 3

Method for producing salt

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a salt using an ion exchange membrane having sufficient ion exchange performance and durability, which can efficiently and stably produce a salt by electrodialysis treatment for a long period of time.SOLUTION: There is provided a method for producing a salt subjected to concentration treatment by electrodialysis treatment, wherein the electrodialysis is carried out by using an ion exchange membrane including a copolymer (P) comprising a vinyl alcohol-based polymer component (A), a vinylene-based polymer component (B) and a polymer component (C) having an ionic group as constituent components as a cation exchange membrane and/or an anion exchange membrane.SELECTED DRAWING: Figure 3

Method for treating landfill leachate

Abstract: PROBLEM TO BE SOLVED: To provide a method for treating a landfill leachate by using an ion exchange membrane having excellent ion exchange performance and dimensional stability, which can remove salts contained in a landfill leachate by electrodialysis treatment efficiently and stably for a long period of time and suppresses occurrence of slime due to proliferation of microorganisms in a concentration chamber of an electrodialyzer.SOLUTION: There is provided a method for treating a landfill leachate in which a landfill leachate including a salt is treated by an electrodialyzer in which a cation-exchange membrane and an anion-exchange membrane are alternately arranged between a cathode and an anode to obtain desalinized water and a salt concentrate, wherein an ion exchange membrane including a copolymer (P) comprising a vinyl alcohol-based polymer component (A), a vinylene-based polymer component (B) and a polymer component (C) having an ionic group as constituent components is used as the cation exchange membrane and/or the anion exchange membrane.SELECTED DRAWING: None

Acid recovery method

Abstract: PROBLEM TO BE SOLVED: To provide an acid recovery method using an ion-exchange membrane which is capable of efficiently recovering acid from a waste acid liquid, has high durability and hardly deteriorates an ion exchange performance even if an electrodialyzer is operated for a long time.SOLUTION: There is provided an acid recovery method using the cation and anion exchange membranes by electrodialysis. The method uses anion exchange membrane containing a copolymer (P) including a vinyl alcohol-based polymer component (A), a vinylene-based polymer component (B) and a polymer component (C) having an ionic group as the constituents of the cation and/or anion exchange membranes.SELECTED DRAWING: None