| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably treat biologically treated water-containing water over a long period when purifying it by RO membrane separation treatment by preventing lowering of a permeating flow bundle through an RO membrane, and to dispense with addition of an expensive slime control agent to RO membrane feed water. <P>SOLUTION: In this treatment method of biologically treated water-containing water, water to be treated containing biologically treated water is brought into contact with chelate resin to remove metal ions, then pH is adjusted to 9.5 or more to be subjected to reverse osmosis membrane separation treatment. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
