| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a new technique for treating or recovering heavy metal elements contained in an industrial effluent harmful to the human body effectively with a low energy and cost. <P>SOLUTION: In reduction and valence conversion processes of a solution containing hexavalent chromium, selenium, uranium, molybdenum, divalent mercury, or the like, the valence of metal elements harmful to the human body is reduced to reduce solubility, thereby realizing separation and recovery. The valence conversion process of elements performs conducting of an AC current, disturbance of an electronic state of the elements due to the magnetic field conversion, and energy supply such as ultraviolet ray irradiation, ultrasonic wave irradiation, high-frequency wave irradiation, electromagnetic wave irradiation and radioactive ray irradiation by devices. The charge of the elements is converted, and the elements wherein solubility is reducing are separated and removed. Oxidation conditions are added thereto to remove the residual metal elements in the solution. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
