A composite membrane comprising: a. a porous support; b. a polymeric layer comprising dialkylsiloxane groups and a metal, the polymeric layer being present on the porous support; c. a discriminating layer present on the polymeric layer; and d. optionally a protective layer present on the discriminating layer wherein the polymeric layer has a molar ratio of metal:silicon of at least 0.0005.

A process for preparing a composite membrane comprising the steps: a) applying a radiation-curable composition to a porous support; b) irradiating the composition and thereby forming a gutter layer of cured polymer; and c) forming a discriminating layer on the gutter layer; wherein the radiation-curable composition comprises a partially crosslinked, radiation-curable polymer comprising epoxy groups and siloxane groups, a photoinitiator and is substantially free from mono-epoxy compounds. Composite membranes and gas separation cartridges are also claimed.

A process for preparing a composite membrane comprising the steps of: a) applying a radiation-curable composition to a porous support; b) irradiating the composition and thereby forming a layer of cured polymer of thickness 20 to 400 nm on the support; c) forming a discriminating layer on the layer of cured polymer; and d) optionally forming a protective layer on the discriminating layer; wherein the radiation-curable composition comprises a partially crosslinked, radiation-curable polymer comprises dialkylsiloxane groups. Composite membranes are also claimed.

Provided is an ammonia stripping device, and a resource recovery type high concentration wastewater treatment system using the ammonia stripping device. The ammonia stripping device optimizes the conditions of pH, temperature, and pressure within a decompression type reactor with respect to raw water resulting from gathering high concentration wastewater and removing a solid therefrom and causes the stripped ammonia to be highly purified in a gas phase without phase change by a separation membrane process of causing the stripped ammonia to pass through a gas separation membrane, and selectively recovering the recovered ammonia. The recovered ammonia of high purity can be reused in being made into resources such as production of urea solutions, power generation by raw materials of green hydrogen and mixed fuel, and so on.

The invention relates to hydrophobic hollow fiber membranes, and in particular, to hydrophobic organic-inorganic composite hollow fiber membranes. Methods for forming the hydrophobic organic-inorganic composite hollow fiber membranes are also disclosed. The hydrophobic organic-inorganic composite hollow fiber membranes may be used in membrane contactor applications such as gas-liquid (G-L) contactor and liquid-liquid (L-L) contactor processes. Applications for G-L membrane contactors include gas streams purification (gas absorption), water ozonation, and water deoxygenation. Applications for L-L membrane contactors include direct contact membrane distillation and liquid-liquid extraction.

An ammonia stripping device, and a resource recovery type high concentration wastewater treatment system using the ammonia stripping device are disclosed. The ammonia stripping device optimizes the conditions of pH, temperature, and pressure within a decompression type reactor with respect to raw water. Stripped ammonia is to be highly purified in a gas phase without phase change by a separation membrane process of causing the stripped ammonia to pass through a gas separation membrane, and selectively recovering the recovered ammonia. The recovered ammonia of high purity can be made into resources such as production of urea solutions, power generation by raw materials of green hydrogen and mixed fuel, and so on.

Described are composite hollow fibers filter membranes that include a porous polymeric hollow fiber support and a filter layer; methods of making the composite hollow fibers and using the composite hollow fibers as a filter membrane; methods of making a filter component or filter from the composite hollow fiber, and filter components and filters that contain the composite hollow fibers as filter membranes.

Disclosed are fibers comprising a composition comprising a fluorinated polymer comprising a plurality of ion exchange groups or a precursor thereof and an aromatic polyamide-imide polymer. The fibers are obtained by electrospinning or forcespinning a composition comprising a fluorinated polymer comprising a plurality of ion exchange groups or a precursor thereof and an aromatic polyamide-imide polymer. The fibers can be arranged into webs suitable for the preparation of composite membranes. In particular composite ion exchange membranes suitable for use in proton exchange fuel cells or filtration devices.