METHOD FOR IMPROVING BLOCKING RATE OF PERMEABLE MEMBRANE, BLOCKING RATE IMPROVED PERMEABLE MEMBRANE, AND PERMEBALE MEMBRANE TREATMENT METHOD AND APPARATUS

摘要

This invention provides a method for improving the blocking rate of a permeable membrane, which can reduce a lowering in permeation flux of the permeable membrane to improve the blocking rate, particularly against organic matter, and thus to realize a high organic matter removing effect and stable treatment, and a permeable membrane, a permeable membrane treatment method, and a permeable membrane apparatus. A blocking rate improving agent (15) of a hydrophilic polymer free from a hydrophobic group having 8 or more carbon atoms is supplied to a primary side (3) of a permeable membrane module (1) to deposit the blocking rate improving agent onto the permeable membrane (2) and thus to treat the permeable membrane (2) with the blocking rate improving agent. Thereafter, a modification agent (16) of a water soluble polymer containing a hydrophobic group having 8 or more carbon atoms is supplied to deposit and modified the modification agent (16) onto the permeable membrane treated with the blocking rate improving agent to further improve the blocking rate.