Abstract: An aeration tube according to the present invention, which is configured to supply a cleaning gas for a filtration unit, includes a straight tubular aeration portion, into one end of which the cleaning gas is force-fed and which has a plurality of aeration holes, and a tubular solid content discharge portion which extends from another end of the aeration portion. In a vertical cross section including a central axis of the aeration portion, a central axis of a discharge side of the solid content discharge portion is inclined downward with respect to the central axis of the aeration portion, and an angle of inclination of the central axis of the discharge side with respect to the central axis of the aeration portion is 20° to 80°. Preferably, the aeration holes are arranged on an upper side of the aeration portion, and centers of the aeration holes coincide with the vertical cross section including the central axis of the aeration portion.

Abstract: A method for operating a filtration apparatus according to an aspect of the present invention is a method for operating a filtration apparatus including three or more filtration modules, the method including a filtration step in which a filtration treatment is performed using the filtration modules and a cleaning step in which some of the filtration modules are stopped from performing the filtration treatment and the filtration modules stopped from performing the filtration treatment are cleaned simultaneously. A filtration apparatus according to another aspect of the present invention is a filtration apparatus including three or more filtration modules, a collection system that collects a filtrate from the filtration modules, and a cleaning system that cleans some of the filtration modules simultaneously.

Abstract: A water treatment method according to the present invention is a water treatment method in which oil is membrane-separated from water to be treated containing the oil and ferrous ions, the water treatment method including an oxidation step of oxidizing the ferrous ions in the water to be treated, and a filtration step of membrane-filtering the water to be treated after the oxidation step. In the oxidation step, a pH of the water to be treated is adjusted to 6 to 9, and an oxidation-reduction potential of the water to be treated is adjusted to 450 to 750 mV.

Abstract: An object is to provide a filtration apparatus which can be reduced in size by relatively densely arranging a plurality of filtration modules and in which the efficiency of cleaning the hollow-fiber membranes can be increased. A filtration apparatus according to the present invention includes a plurality of filtration modules, each including a plurality of hollow-fiber membranes, which are arranged in parallel in a vertical direction so as to form a substantially curtain-like shape, and a pair of rod-shaped holding members that secure top and bottom ends of the hollow-fiber membranes; one or more cleaning modules that supply bubbles to the filtration modules from below; and a frame that holds the filtration modules and the one or more cleaning modules. The filtration modules are arranged in parallel and with substantially constant intervals therebetween.

Abstract: A magnet roller according to the present invention comprises: a single metal shaft member; and a pair of first and second semicylindrical resin magnet members each of which is shorter than the metal shaft member and has a first or second annular portion integrally provided at one end portion thereof. Each of first and second central holes is provided at the center of each of the first and second annular portions. The magnet roller according to the present invention is assembled by arranging the first annular portion and the second annular portion so as not face each other, inserting both end portions of the metal shaft member into the first and second central holes from the inner side of the first and second annular portions, and sandwiching the metal shaft member between the first and second semicylindrical resin magnet members in such a manner that both the end portions of the metal shaft member protrude to the outside of the first and second annular portions.

Abstract: Provided is a separation membrane module which is suitable for filtration of oil-containing wastewater. The separation membrane module for oil-containing wastewater treatment separates water-insoluble oil from oil-containing wastewater that has high turbidity and/or high temperature. The separation membrane module for oil-containing wastewater treatment is characterized by using a hollow fiber membrane which is composed of an alkali-resistant porous membrane selected from polytetrafluoroethylene (PTFE), polysulfone (PSF), and polyether sulfone (PES) and which has a tensile strength of 30 N or more, and characterized in that each of the hollow fiber membrane and an end-sealing member of the hollow fiber membrane has a heat distortion temperature of 100° C. or higher.

Abstract: Devices used in an oil-containing wastewater treatment system are simplified by efficiently combining differences in processes used in the system. The oil-containing wastewater treatment system includes a separation tank that separates oil by flotation, the separation tank being arranged in a supply path of raw water which is oil-containing wastewater; a membrane filtration tank that is arranged on the downstream of the separation tank and that includes therein a membrane separation module including a hollow fiber membrane or a flat sheet membrane, and a diffuser for generating air bubbles, the diffuser being disposed below the membrane separation module; a supply pipe that supplies the raw water from the separation tank to the membrane filtration tank through a circulating pump; and a return pipe that returns unfiltered water containing the oil and air bubbles from the membrane filtration tank to the separation tank.

Abstract: A magnet roller according to the present invention comprises: a single metal shaft member; and a pair of first and second semicylindrical resin magnet members each of which is shorter than the metal shaft member and has a first or second annular portion integrally provided at one end portion thereof. Each of first and second central holes is provided at the center of each of the first and second annular portions. The magnet roller according to the present invention is assembled by arranging the first annular portion and the second annular portion so as not face each other, inserting both end portions of the metal shaft member into the first and second central holes from the inner side of the first and second annular portions, and sandwiching the metal shaft member between the first and second semicylindrical resin magnet members in such a manner that both the end portions of the metal shaft member protrude to the outside of the first and second annular portions.

Abstract: Provided is a separation membrane module which is suitable for filtration of oil-containing wastewater. The separation membrane module for oil-containing wastewater treatment separates water-insoluble oil from oil-containing wastewater that has high turbidity and/or high temperature. The separation membrane module for oil-containing wastewater treatment is characterized by using a hollow fiber membrane which is composed of an alkali-resistant porous membrane selected from polytetrafluoroethylene (PTFE), polysulfone (PSF), and polyether sulfone (PES) and which has a tensile strength of 30 N or more, and characterized in that each of the hollow fiber membrane and an end-sealing member of the hollow fiber membrane has a heat distortion temperature of 100° C. or higher.

Abstract: An apparatus of produced water treatment, to be adopted in an in-situ recovery method of producing bitumen from oil sand, the apparatus capable of removing the oil from produced water, the produced water of being left by separating the bitumen from bitumen-mixed fluid having been recovered from the oil sand, the apparatus having: a vessel for receiving the produced water; a submerge type filtration membrane module, installed in the vessel, for filtering the produced water in the condition of the membrane being submerged in the produced water; and a bubble generator for generating bubbles to be forwarded toward the submerged filtration membrane in the produced water.

Abstract: A porous multilayered hollow fiber for outer side pressed filtration is made of a multilayer comprising a supporting layer constituted of the thickness of an expanded porous polytetrafluoroethylene tube, and a filtration layer provided on the outer surface of the supporting layer, wherein pores surrounded by fibrous frameworks in the filtration layer are smaller than those of the supporting layer, and the mean of the maximum fibril length (L) of the fibrous frameworks surrounding each pore in the outer surface of the filtration layer is designed to be small such that (X) and (Y) fall within the range on the XY plane, where (X) is a particle diameter of particles captured when the particle trapping ratio is equal to or more than 90% in the case where the filtration is done under an elevated pressure of 0.1 MPa, and (Y) is a value designated as RFL obtained by dividing (L) by (X).

Abstract: There is provided a compact filtration device capable of efficiently separate and remove suspension components adhered to membrane surfaces or to between membranes by allowing bubbling action by means of bubbles from an air diffusion tube to effectively affect the entire hollow fiber membrane, and capable of disposing inside hollow fiber membranes in high density. In a filtration device 11 for performing solid-liquid separation by allowing a liquid to be treated 12 containing suspension components to permeate a membrane module 14 for immersion type suction filtration or external pressure filtration, said membrane module 14 is formed from bundled membranes 16 in which a multiplicity of hollow fiber membranes 15 with their axes being in the vertical direction are contacted closely with each other at the upper and lower ends thereof, and a diffuser tube 21 is threaded into between said multiplicity of hollow fiber membranes 15 for insertion at the lower part of the bundled membrane 16.

Abstract: A porous multilayered hollow fiber for outer side pressed filtration is made of a multilayer comprising a supporting layer constituted of the thickness of an expanded porous polytetrafluoroethylene tube, and a filtration layer provided on the outer surface of the supporting layer, wherein pores surrounded by fibrous frameworks in the filtration layer are smaller than those of the supporting layer, and the mean of the maximum fibril length (L) of the fibrous frameworks surrounding each pore in the outer surface of the filtration layer is designed to be small such that (X) and (Y) fall within the range on the XY plane, where (X) is a particle diameter of particles captured when the particle trapping ratio is equal to or more than 90% in the case where the filtration is done under an elevated pressure of 0.1 MPa, and (Y) is a value designated as RFL obtained by dividing (L) by (X).