Patent ID: 8070947

Claim:
A method for manufacturing a permselective membrane module, the module including permselective membranes housed in a vessel with both ends of the membranes being fixed; the method comprising: preparing at least one cleaning pipe, the pipe having a first open end, a second closed end and an outer surface with a plurality of perforations; preparing an upper holder comprising through-hole sections separated by stays and a central through-hole for the cleaning pipe; preparing a lower holder having sections separated by stays having slits therethrough; preparing a plurality of permselective membranes comprising hollow fiber membranes; connecting the first end of the cleaning pipe to the center of the upper holder and connecting the second end of the cleaning pipe to the center of the lower holder; making an element by fixing first ends of the hollow fiber membranes to the through-holes of the upper holder and by fixing second ends of the hollow fiber membranes with the lower holder; and placing the element in a vessel; wherein raw water can be supplied from the lower portion of the vessel to the surface of the hollow membranes via the lower holder; and the filtrate is discharged from the upper end of the hollow membranes which are fixed to the upper holder; and suspended matter entering the cleaning pipe via the perforations of the cleaning pipe can be discharged out of the cleaning pipe when cleaning the hollow membranes.