Abstract: The present disclosure relates to an external pressure type hollow fiber membrane component, a filtration membrane component, and a membrane filtration assembly, and provides an external pressure type hollow fiber membrane component, comprising: a housing having an inner cavity; and two end parts respectively provided at two ends of the inner cavity of the housing, the end parts being provided with a plurality of void passages running through the end parts in the axial direction of the housing and a plurality of water collection passages communicated with each other, and the void passages and the water collection passages are staggered at intervals. The present disclosure also provides a filtration membrane component and a membrane filtration assembly.

Abstract: The present disclosure relates to an external pressure type hollow fiber membrane component, a filtration membrane component, and a membrane filtration assembly, and provides an external pressure type hollow fiber membrane component, comprising: a housing having an inner cavity; and two end parts respectively provided at two ends of the inner cavity of the housing, the end parts being provided with a plurality of void passages running through the end parts in the axial direction of the housing and a plurality of water collection passages communicated with each other, and the void passages and the water collection passages are staggered at intervals. The present disclosure also provides a filtration membrane component and a membrane filtration assembly.

Abstract: A hollow-fiber membrane assembly having the function of preventing the membrane filaments from cracking, which comprises: hollow-fiber membrane filaments (1), protective film(s) (2) and fastening material (3), wherein the protective film (2) enwraps the outside of the hollow-fiber membrane filament(s) (1) near the end head (5), and a portion of the protective film (2) is immobilized in the fastening material (3), while the rest portion of the protective film (2) outside of the fastening material (3) is left free.

Abstract: There is provided a hollow fiber membrane module (1) comprising: a membrane bundle (20) of a plurality of hollow fiber membranes (10); a cylindrical body (30) housing the membrane bundle (20); a fixing portion (40, 50) in which at least one end of the membrane bundle (20) is fixed to the cylindrical body (30); and a raw water outflow nozzle (34) for allowing raw water to flow out from the vicinity of the fixing portion (40). Raw water supplied into the cylindrical body (30) is allowed to permeate from the outside into the inside of each hollow fiber membrane (10). A soft potting portion (42) has, in its surface to be in contact with raw water, at least one groove (43).

Abstract: A hollow-fiber membrane assembly having the function of preventing the membrane filaments from cracking, which comprises: hollow-fiber membrane filaments (1), protective film(s) (2) and fastening material (3), wherein the protective film (2) enwraps the outside of the hollow-fiber membrane filament(s) (1) near the end head (5), and a portion of the protective film (2) is immobilized in the fastening material (3), while the rest portion of the protective film (2) outside of the fastening material (3) is left free.

Abstract: The invention provides a shaft type submerged hollow fiber membrane module, comprising a hollow aerating shaft (1), an aerating head (2), hollow fiber membranes (4), an upper end head (5), a lower end head (6), an upper end cap (7), a lower end cap (8), a water-producing opening (9), an aerating gas inlet (10), a protective net (11) and adhesive material (12), wherein the hollow fiber membranes (4), the hollow aerating shaft (1), the upper end head (5), the lower end head (6) and the adhesive material (12) are fixed together; the aerating head (2), the number of which is at least one, is connected to the hollow aerating shaft (1); the water-producing opening (9) is disposed at the top and/or the bottom of the membrane module; the aerating gas inlet (10) is disposed at one or both ends of the hollow aerating shaft (1); and the protective net (11) covers the periphery of the membrane module. The invention further provides a filter comprising the shaft type submerged hollow fiber membrane module.

Abstract: A hollow fiber membrane module with a fixed structure comprises: a bearing shell (7), an inlet (8), a concentrated water outlet (10), a produced water outlet (9), a central tube (1) and hollow fiber membranes (6), in which the hollow fiber membranes (6), the central tube (1) and the bearing shell (7) are fixed together, the inlet (8) is located at one end of the hollow fiber membranes (6), the concentrated water outlet (10) is located at the other end of the hollow fiber membranes (6), the produced water outlet(s) (9) is(are) located at one end or both ends of the central tube (1), and there are small holes drilled on the side wall of the central tube (1). The module also comprises at least one separate fixed ring(s) (2) for fixing the hollow fiber membranes (6), with the separate fixed ring(s) (2) fixed on the central tube (1) and the hollow fiber membranes (6) arranged in parallel through the separate fixed ring(s) (2).

Abstract: There is provided a hollow fiber membrane module (1) comprising: a membrane bundle (20) of a plurality of hollow fiber membranes (10); a cylindrical body (30) housing the membrane bundle (20); a fixing portion (40, 50) in which at least one end of the membrane bundle (20) is fixed to the cylindrical body (30); and a raw water outflow nozzle (34) for allowing raw water to flow out from the vicinity of the fixing portion (40). Raw water supplied into the cylindrical body (30) is allowed to permeate from the outside into the inside of each hollow fiber membrane (10). A soft potting portion (42) has, in its surface to be in contact with raw water, at least one groove (43).

Abstract: A hollow fibre membrane module with a fixed structure comprises: a bearing shell (7), an inlet (8), a concentrated water outlet (10), a produced water outlet (9), a central tube (1) and hollow fibre membranes (6), in which the hollow fibre membranes (6), the central tube (1) and the bearing shell (7) are fixed together, the inlet (8) is located at one end of the hollow fibre membranes (6), the concentrated water outlet (10) is located at the other end of the hollow fibre membranes (6), the produced water outlet(s) (9) is(are) located at one end or both ends of the central tube (1), and there are small holes drilled on the side wall of the central tube (1). The module also comprises at least one separate fixed ring(s)(2) for fixing the hollow fibre membranes (6), with the separate fixed ring(s)(2) fixed on the central tube (1) and the hollow fibre membranes (6) arranged in parallel through the separate fixed ring(s)(2).

Abstract: The present invention provides a polyvinyl chloride hollow filtration membrane, which mainly comprises the following components: 30-95 wt. % of polyvinyl chloride and 5-70 wt. % of vinyl chloride-vinyl acetate-maleic anhydride terpolymer, wherein the polymerization degree of polyvinyl chloride is from 700 to 2500; the content of vinyl acetate is 10-19 % and the content of maleic anhydride is 18-40 % on a basis of total weight of the terpolymer; and the absolute viscosity of the terpolymer is 1.2-1.9 mPa·s. A method for preparing such a polyvinyl chloride hollow filtration membrane is also provided in the present invention.

Abstract: The present invention provides a polyvinyl chloride hollow filtration membrane, which mainly comprises the following components: 30-95 wt. % of polyvinyl chloride and 5-70 wt. % of vinyl chloride-vinyl acetate-maleic anhydride terpolymer, wherein the polymerization degree of polyvinyl chloride is from 700 to 2500; the content of vinyl acetate is 10-19 % and the content of maleic anhydride is 18-40 % on a basis of total weight of the terpolymer; and the absolute viscosity of the terpolymer is 1.2-1.9 mPa•s. A method for preparing such a polyvinyl chloride hollow filtration membrane is also provided in the present invention.