FLOCCULANT FOR WASTE WATER PURIFICATION, METHOD FOR PURIFYING WASTE WATER USING SAME, AND APPARATUS FOR PURIFYING WASTE WATER USING SAME

摘要

Disclosed is a means for highly efficiently removing a metal which is dissolved in waste water.  Specifically, a water-soluble polymer (2) having a carboxyl group is added into waste water in which a metal salt (1) is dissolved.  As a result, an ion bond (3) which is composed of a water-soluble polymer having a metal ion acidic group is formed therein.  Then, a solution of a water-soluble polymer (4) having an amino group is added thereto.  By the addition of the water-soluble polymer having an amino group, an ion bond (5) which is composed of an acidic group of the water-soluble polymer having an acidic group and an amino group of the water-soluble polymer having an amino group is formed therein.  By the formation of the ion bond, the water-soluble polymer having an amino group and the water-soluble polymer having an acidic group are crosslinked with each other.  Since the thus-obtained crosslinked product is not soluble in water, the crosslinked product is deposited as a flocculated material (6) in which metal ions are trapped.