Abstract: A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided.

Abstract: A membrane element sealing material holding member comprising a central opening for insertion of a center tube of spiral membrane element, peripheral orifice for flowing of a raw liquid into a membrane end portion of membrane element and outer circumferential part for holding of circular sealing material, wherein the central opening has inner circumferential surface of cylindrical form with a diameter larger than the outer diameter of the inserted center tube, and wherein at three or more positions on the inner circumferential surface, there is provided projection that has sloping face on its side of center tube insertion and is deformable at the time of insertion of center tube with an outer diameter larger than that of incircle.

Abstract: Provided are a connection member capable of preventing leakage from a supply side to a permeating side from occurring by a simple means; and a separation membrane module using the connection member. The connection member (20) is used to connect in series a plurality of separation membrane elements equipped with end surface holding members (36) and to install the separation membrane elements in a pressure-resistant vessel (38). The connection member (20) is characterized in that, when the separation membrane elements are connected to each other, the connection member is engaged with respective grooves (36b) of the end surface holding members (36) adjacent to each other.

Abstract: Provided are a pressure vessel for a membrane element in which the membrane element can be easily mounted, a membrane filtration apparatus equipped with the pressure vessel for a membrane element, and a method for manufacturing a membrane filtration apparatus. A rail (protrusion) 60 is formed on the inner circumferential surface of the pressure vessel 40 in such a manner that a ridge line 61 extends along the insertion direction of the membrane element. Consequently, the membrane element 10 can be inserted into the pressure vessel 40 so as to be in a sliding contact onto the ridge line 61 of the rail 60 formed on the inner circumferential surface of the pressure vessel 40. Therefore, the frictional resistance can be reduced as compared with conventional ways, so that the membrane element 10 can be easily mounted onto the pressure vessel 40.

Abstract: It is an object of the present invention to provide a process for producing, easily and at a low cost, a composite semipermeable membrane having excellent contamination resistance, especially microbial contamination resistance, and a composite semipermeable membrane produced by the process. The process for producing a composite semipermeable membrane of the present invention comprises forming a skin layer including a polyamide resin obtained by a reaction between a polyfunctional amine component and a polyfunctional acid halide component on the surface of a porous support; forming a polymer layer (A) including a silver salt compound on the skin layer directly or through other layers; and reducing the silver salt compound to precipitate metal silver in the polymer layer (A) and/or on the surface thereof.

Abstract: It is an object of the present invention to provide a composite semipermeable membrane having an excellent resistance property to contamination, particularly an excellent resistance property to microbial contamination, and a water treatment method using the composite semipermeable membrane. The present invention relates to a composite semipermeable membrane comprising a skin layer formed on the surface of a porous support and containing a polyamide-based resin obtained by reacting a polyfunctional amine component with a polyfunctional acid halide component, wherein an antibacterial layer containing a silver-based antibacterial agent and a polymer component is formed on the skin layer directly or with other layer interposed therebetween, and the weight ratio between the silver-based antibacterial agent and the polymer component in the antibacterial layer is 55:45 to 95:5 (silver-based antibacterial agent:polymer component).

Abstract: A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided.

Abstract: An object of the invention is to provide a spiral separation membrane element that can reduce the pressure loss of a feed-side channel and be much less vulnerable to the problem of inhibition or blockage of the flow in the feed-side channel. The spiral separation membrane element includes one or more separation membranes, one or more feed-side channel components, one or more permeation-side channel components, and a perforated hollow core tube around which the separation membranes, the feed-side channel components and the permeation-side channel components are wrapped, wherein the feed-side channel component is a net formed by fusion bonding.

Abstract: An object of the invention is to provide a spiral separation membrane element that can reduce the pressure loss of a feed-side channel and be much less vulnerable to the problem of inhibition or blockage of the flow in the feed-side channel. The spiral separation membrane element includes one or more separation membranes, one or more feed-side channel components, one or more permeation-side channel components, and a perforated hollow core tube around which the separation membranes, the feed-side channel components and the permeation-side channel components are wrapped, wherein the feed-side channel component is a net formed by fusion bonding.

Abstract: A spiral membrane module where membrane elements are easily connected to each other and the connection thereof is prevented from being loosened. The spiral membrane elements (20) are each formed in multiple layers by winding membranes and channel materials around a center tube (3) having holes and are received in a pressure vessel (10) such that they are connected in series with connection mechanisms (J) placed between the membrane elements (20). Each connection mechanism (J) has a movable member (M) installed at either the upstream side end part or the downstream side end part of each membrane element (20) and having an engagement part (9d) engageable with the other of the upstream side end or the downstream side end. The movable member (M) has a contact part (9c) coming into contact with the inner wall (10a) of the pressure vessel (10) and locking the engagement by the engagement part (9d).

Abstract: A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided.

Abstract: A membrane element sealing material holding member that even when the dimension of outer diameter of center tube varies, enables holding of the center tube in the center and further enables easy insertion of the center tube; and a membrane element utilizing the same.

Abstract: An object of the present invention is to provide a spiral membrane element that can improve the barrier property of a fiber reinforced plastic layer having a fiber roll as a reinforcing phase and that can effectively prevent occurrence of cracks.

Abstract: An object of the present invention is to provide a spiral membrane element that can form a uniform fiber reinforcement layer on an outer circumferential surface by a simple process without a great change in the materials, as well as a process for producing the same. The spiral membrane element of the present invention is a spiral membrane element which is provided with a cylindrical roll R in which a separation membrane, a feed-side flow passageway member, and a permeate-side flow passageway member 3 are spirally wound in a laminate state around a perforated center tube 5 and in which a sealing part for preventing mixing of feed-side fluid and permeate-side fluid is disposed, wherein at least one sheet of the permeate-side flow passageway member 3 has a fiber cloth 23a extended or connected to the outer circumferential side, and the fiber cloth 23a is wound around an outer circumference of said cylindrical roll R, impregnated with a resin and hardened to thereby form a fiber reinforcement layer.

Abstract: A spiral membrane element that can reduce the dimension increase in the length direction is provided by forming a fiber reinforced resin layer having a reinforcing fiber layer and a strengthening fiber layer. Also, a method for producing a spiral membrane element is provided having a step of forming a fiber reinforced resin layer having a reinforcing fiber layer and a strengthening fiber layer. The spiral membrane element is provided with a cylindrical wound body in which a separation membrane, a feed-side channel material, and a permeate-side channel material in a laminated state are wound in a spiral form around a center tube having a hole, and a sealing part for preventing feed-side fluid and permeate-side fluid from being mixed with each other, wherein a fiber reinforced resin layer having a reinforcing fiber layer and a strengthening fiber layer enclosed and buried with the same resin is provided on an outer circumferential side of the cylindrical wound body.

Abstract: An object of the invention is to provide a spiral separation membrane element that can reduce the pressure loss of a feed-side channel and be much less vulnerable to the problem of inhibition or blockage of the flow in the feed-side channel. The spiral separation membrane element includes one or more separation membranes, one or more feed-side channel components, one or more permeation-side channel components, and a perforated hollow core tube around which the separation membranes, the feed-side channel components and the permeation-side channel components are wrapped, wherein the feed-side channel component is a net formed by fusion bonding.

Abstract: A sealer holding member for a membrane element is disposed at an end of a spiral-type membrane element on an outer circumference thereof, and allows a feed to flow into a membrane end of the membrane element. The sealer holding member includes a first annular portion, an annular projection, a second annular portion, and a third annular portion arranged in this order. The first annular portion is engaged with an outer-covering member for the membrane element and receives an end of the membrane element without contacting a side of the membrane element. The second annular portion receives a sealer on an outside thereof.

Abstract: A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided.

Abstract: A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided.

Abstract: A sealer holding member for a membrane element is disposed at an end of a spiral-type membrane element on an outer circumference thereof, and allows a feed to flow into a membrane end of the membrane element. The sealer holding member includes a first annular portion, an annular projection, a second annular portion, and a third annular portion arranged in this order. The first annular portion is engaged with an outer-covering member for the membrane element and receives an end of the membrane element without contacting a side of the membrane element. The second annular portion receives a sealer on an outside thereof.