enable oxygen containing gas to be supplied to the lumens of the hollow fibers various reactors using such modules are described application_number US 77720404 A description fig1 shows a textile polymethyl pentene fibre with 45 micron outside diameter and 15 to 30 micron inside diameter the fibre is made by a melt extrusion process in which the pmp is melted and drawn through an annular spinnerette the raw polymer used was mx 001 produced by mitsui petrochemical outside diameters of 30 u2013 50 microns may be used the fibres are hollow inside but non porous oxygen travels through the fibre walls by molecular diffusion in fig2 the fibre is woven in a fabric with pmp fibre running horizontally and an inert fibre running vertically to provide support to the fine pmp fibre fig3 shows a module in which a bundle or stack of sheets of fabric are potted at both ends in a header using potting materials such as polyurethane hot melt or epoxy a large sheet of the fabric may also be rolled or folded to produce a module rather than using separate sheets the bundle is assembled together with spacers between the sheets of fabric which provide a gap between the sheets for aeration and substrate flow these spacers may be plastic strips or hot melt layers the gap between sheets may range from 3 mm to 15 mm depending on the nature of the wastewater the length of the module may range from 1 m to 5 m to produce the module of fig3 a sheet of fibres is laid onto strips of adhesive located to cross the ends of the fibres spacing strips were then placed over the sheet followed by additional strips of adhesive.