JP2000000439A5 - - Google Patents

Description

[0012]
In FIG. 1, hollow fiber membranes 2 bundled in a U-shape are inserted into the outer cylinder 1 of the membrane module, and the hollow fiber membrane bundle is adhered and fixed with potting material 3 at the end of the outer cylinder. An example of a hollow fiber type filtration membrane module is shown in which a filter member 5 is incorporated in contact with the opening end face 4 and a module cap 8 for collecting membrane filtration water is attached. One example of usage of the hollow fiber membrane type filtration membrane module shown in FIG. 1 is as follows. That is, raw water containing suspended solids is introduced into the membrane module from the raw water supply nozzle 10B , and permeates through the membrane from the outside to the inside of the hollow fiber membrane to be filtered. The filtered membrane filtered water flows in the hollow portion of the hollow fiber membrane, passes from the opening end face 4 through the water collecting section 7, and is taken out from the membrane filtered water outlet nozzle 6 of the membrane module. Suspended matter in the raw water is trapped and deposited on the outer surface of the hollow fiber membrane. If the suspended cake layer deposited on the outer surface of the hollow fiber membrane becomes thick and filtration resistance increases, and the differential pressure required for filtration reaches a predetermined value, the supply of raw water is stopped, and as necessary A certain amount of filtered water is reversely flowed back from the nozzle 6 and back pressure washed, air is further introduced from the nozzle 11, and the hollow fiber membrane is shaken by the rising flow of water bubbles generated as the air bubbles and bubbles rise. Move to physically remove the cake layer consisting of suspended matter. The membrane-filtered water passes through the filter member 5 made of a filtration material having a larger pore diameter than the pore diameter of the hollow fiber membrane placed at the point where it is discharged from the opening of the hollow fiber membrane to the water collection portion The nozzle 6 is taken out of the membrane module.

[0013]
In FIG. 2, the hollow fiber membrane bundle 12 is inserted into the outer cylinder 21 of the membrane module, and the hollow fiber membrane bundle is adhered and fixed with the potting materials 13 and 13 'at both ends of the outer cylinder. 14 shows an example of a hollow fiber type filtration membrane module having a structure in which filter members 15 and 15 'are incorporated in contact with 14 and 14' and module caps 18 and 18 'for membrane water collection are attached. . One example of usage of the hollow fiber membrane type filtration membrane module shown in FIG. 2 is as follows. That is, raw water containing suspended matter is introduced into the membrane module from the raw water supply nozzle 20 and / or 20 ′, and is filtered from the outside of the hollow fiber membrane through the inside of the membrane. The filtered permeated water flows through the hollow portion of the hollow fiber membrane from the opening end face 14 and / or 14 'through the water collecting part 16 and / or 16' to the permeated water outlet nozzle 17 and / or 17 of the membrane module. Taken from '. The raw water is supplied by providing a plurality of passages through the potting portion in the potting portion to which the hollow fiber membrane bundle located below the hollow fiber membrane type filtration membrane module is adhered and fixed, and the hollow fiber membrane bundle from this raw water passage The structure may be uniformly supplied to the inside as much as possible. Suspended matter in the raw water is trapped and deposited on the outer surface of the hollow fiber membrane. If the suspended cake layer deposited on the outer surface of the hollow fiber membrane becomes thick and filtration resistance increases, and the differential pressure required for filtration reaches a predetermined value, the supply of raw water is stopped, and as necessary A certain amount of filtered water is reversely flowed back from the nozzle 17 and / or 17 'and back pressure washing, air is further introduced from the nozzle 20', and the hollow fiber membrane is swung by the rising flow of air bubbles and bubbles. Physically remove the cake layer consisting of suspended matter. In the case of a hollow fiber membrane type filtration membrane module having a structure having a plurality of raw water supply passages provided penetrating through the potting portion, pressurized air is discharged from the raw water supply passage and the foam and the foam rise. The hollow fiber membrane is rocked by the upward flow of the generated water to physically remove the cake layer consisting of the suspended matter. The membrane-filtered water passes through the filter member 15 and / or 15 'made of a filtration material having a larger pore size than the pore diameter of the hollow fiber membrane placed at the point where it is discharged from the opening of the hollow fiber membrane to the water collection portion It is taken out of the membrane module from the permeate outlet nozzles 17 and / or 17 'of the module. FIG. 3 shows a membrane module having the same configuration as that of FIG. 2, but shows an example where the hollow fiber membrane at one end of the membrane module is a closed end sealed. Reference numeral 32 denotes a closed end, and 33 denotes a central pipe provided with a plurality of small holes for dissipating air for physical cleaning. Reference numeral 34 denotes a physical cleaning air introduction hole.