| 摘要 |
[Problem] to provide a porous hollow-fiber membrane for liquid treatment, having a high filtration performance for beer fermentation liquid, minimal clogging during the filtration process, and excellent recovery of membrane performance by rinsing. [Solution] The present invention is a porous hollow-fiber membrane for ultrafiltration or precision filtration, wherein when the inner surface is observed using a 200X scanning electron microscope, the hole shape is circular, when the outer surface is observed using a 1000X scanning electron microscope, the hole shape is undefined, and when the membrane cross-section is observed with a 200X scanning electron microscope, pores in the vicinity of the inner surface are larger than pores in the vicinity of the outer surface, and the demineralized water FLUX from the inside of the hollow-fiber membrane to the outside of the hollow-fiber membrane at 25°C is 10,000-30,000L/ｍ2/h/bar. |
