| 摘要 |
<p>PURPOSE: To guarantee sufficient removal of organic toxic substances from a material to be processed so as to obtain stackable, reusable, or reclaimable solid residues without difficulties by adding an organic solvent to the material to be processed, mixing them sufficiently, and removing a residual solvent from residues from which an organic liquid phase containing toxic substances has been separated. CONSTITUTION: In a step 1, at room temperature or temperatures elevated to the boiling starting point of a solvent or less, the disposal of decanter sludge is performed in an agitation container containing a special organic solvent that is immiscible with excess water, and in a step 2 the decantation of an organic liquid phase is performed after settlement of solids. In a step 3, removal of the solvent residue in residue disposal, partial or complete removal of clinging water, and coupling of remaining water by the addition of an aggregate such as anhydrous gypsum during the partial removal of the water are performed. In a step 4, distillation is performed, and a discharge liquid with little solid contents contains a solvent/oil mixture, from which the solvent can be reclaimed sufficiently without losses.</p> |
