| 摘要 |
<p>PROBLEM TO BE SOLVED: To treat even a small quantity of solvent contained in waste water, not discharged to outside equipment by installing a waste water returning path for introducing waste water separated by a solvent recovery part to before an adsorption part. SOLUTION: Gas after desorption containing a solvent component and moisture is condensed in a cooling part 11 of a solvent recovery part 3, and gas containing uncondensed solvent is returned to a position in which there is an unheated adsorbent 12 by a gas returning device 21, and the solvent component is adsorbed on the adsorbent 12 again. The solvent and the moisture condensed in the cooling part 11 are returned to a recovery tank 18, and are separated into solvent 18a and moisture 18e by difference in specific gravity or the like, and the solvent 18a is transferred to outside equipment from a solvent discharge path 15 and is subjected to separate reuse or the like. On the other hand, the separated moisture 18e is sent as waste water to the bottom part of the adsorption part 1 through a waste water returning path 16. This waste water is stored in the adsorption part 1 and evaporates of itself and is discharged from a waste gas discharge path 6 together with the purified gas. At this time, the solvent component is adsorbed on the adsorbent 12.</p> |
