PROBLEM TO BE SOLVED: To improve recovery efficiency and concn. efficiency of treated water at the time of collecting and recovering the microorganism in water by providing a stage for passing water into a hollow part from the outer membrane face side of each hollow-fiber membrane constituting a hollow-fiber membrane bundle to collect microorganism on the outer membrane face and a stage for recovering the microorganism collected on the outer membrane face. ;SOLUTION: The open end of the hollow-fiber membrane bundle 1 of a hollow-fiber membrane module communicating with the hollow part of each membrane is supported and fixed with a potting agent 2, and the bundle 1 is arranged in a vessel member A. When microorganism is collected and recovered, a sample water is introduced into the module from a water inlet 4 and filled in a region 7. The supplied water is permeated through the membrane from the outer membrane face side into the hollow part, introduced into a region 6 and finally discharged from a water intake 3. After the water is passed for a specified time, the water retained in the region 7 is recovered, a vessel member B is detached to expose the bundle 1, the bundle is cleaned, the cleaning soln. and the recovered water from the region 7 are joined, and the collected material is recovered.;COPYRIGHT: (C)1999,JPO
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