| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for economically advantageously collecting and recycling a cleaning water from an impregnant-containing cleaning waste water generated in an impregnation process for the object materials such as cast products using a water-soluble impregnant liquid. <P>SOLUTION: The method includes: filtering the cleaning waste water including the impregnant liquid containing the water-soluble (meth)acrylic esters as a polymerizable component by using a hydrophilic precise filtering membrane to separate and remove the non-water-soluble component in the cleaning waste water; and extracting the polymerizable component in the impregnant liquid using an extractant comprising a 7-12C monovalent alcohol to reuse the obtained extraction residual liquid as the cleaning water. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
