Composite polyether block amide (PEBA) copolymer tubes incorporate an ultra-thin PEBA layer that enables rapid moisture transfer and exchange through the tube. A composite PEBA film may include a porous scaffold support and may be formed or incorporated into the composite PEBA tube. A porous scaffold support may be coated or imbibed with PEBA to form a composite PEBA film. A composite PEBA film may be wrapped on a mandrel or over a porous scaffold support to form a composite PEBA tube. A film layer may be applied over a wrapped composite PEBA film to secure the layers together. The film layer by applied by dipping, spraying or painting.

A method of manufacturing a separator element for obtaining molecular and/or particulate separation by tangential flow of a fluid medium for treatment into a filtrate and a retentate, the element having a structure (2) of at least two porous rigid columns (3) made of the same material, positioned side by side to define, outside their outside walls, a volume (4) for recovering the filtrate, each column (3) presenting, internally, at least one open structure (5) for passing a flow of the fluid medium, opening out in one of the ends of the porous column for inlet of the fluid medium for treatment, and in the other end for outlet of the retentate. The element is a single-piece rigid structure (2) made as a single piece that is uniform and continuous throughout, without any bonds or exogenous additions.

The present invention provides a membrane separation device suitable for suppressing deterioration of hygienic conditions inside a membrane separation device. The membrane separation device includes a spiral membrane element. The membrane element includes: a central tube having a through hole; and a membrane leaf wound around the central tube and having a pervaporation membrane that separates a fermented liquid containing a volatile organic compound into a permeated fluid and a non-permeated fluid. A flow of the non-permeated fluid into a space adjacent to an outer circumferential surface of the membrane element is blocked during operation of the membrane separation device.

A preparation method for a tubular gas-permeable membrane and a wastewater treatment of an ammonia nitrogen removal process are provided. The preparation method for a tubular gas-permeable membrane includes: cutting a flat sheet gas-permeable membrane into a strip shape, and then sequentially winding, overlapping, bonding, tubulating, and cutting the strip-shaped flat sheet gas-permeable membrane to form a tube-shaped tubular gas-permeable membrane. The preparation method is based on an original flat sheet gas-permeable membrane and an optimized rolling technology. Compared with a traditional gas-permeable membrane, the prepared tubular gas-permeable membrane has higher ammonia mass transfer efficiency, and the tubular gas-permeable membrane adopts a closed columnar membrane structure, such that an ammonia gas leakage rate can be obviously reduced, and ammonia nitrogen removal efficiency of wastewater can be greatly improved. An ammonia nitrogen resource can be recovered while ammonia nitrogen wastewater is treated, and desirable economic benefits and environmental benefits are achieved.

The present disclosure provides a filtration membrane. The filtration membrane includes a thermoplastic substrate, a first layer comprising a polysulfone, a polyvinylpyrrolidone, and a pentaamine, and a second layer comprising the pentaamine and reacted units of a phthaloyl chloride cross-linked to form a polyamide. A method of preparing the filtration membrane by impregnating pentaamine in an ultrafiltration support matrix for rapidly fabricating a hyper-cross-linked polyamide membrane is also disclosed. The membrane prepared by the method of present disclosure can be used for organic solvent nanofiltration (OSN).