| 摘要 |
An apparatus for withdrawing filtered permeate from a substrate is described. The apparatus has a header with a plurality of hollow fibre membranes extending from a first face of the header. Ends of the membranes are open to a receptacle for collecting permeate in fluid communication with a second face of the header. A portion of the substrate drawn into the lumens of the fibres as permeate may flow into the receptacle and be extracted through a permeate outlet of the receptacle. A pipe with holes for discharging bubbles near the first face of the header extends from the first face of the header from a location within the plurality of membranes. Holes may be located at various locations around the circumference of the pipe, at various locations along the length of the pipe or in arms extending outwards from the pipe. A system for withdrawing filtered permeate from a substrate held in a container at ambient pressure uses an apparatus as described above. The apparatus is immersed in the substrate such that the first face of the header is generally horizontal and the membranes extend generally vertically upwards from the first face of the header. A source of suction is applied to the permeate outlet and operated to withdraw permeate from the lumens of the membranes. An aeration system supplies pressurised gas to the pipe. <IMAGE> |
