| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for treating chemical cleaning waste water capable of reducing the volume of the waste water and of heating/drying the waste water in a short time utilizing a small apparatus, thereby preventing the increase of a secondary waste such as an absorbing liquid or a waste containing sulfuric acid component and also preventing the leakage of an odor material such as ammonia, in order to be able to effectively heat and dry the waste and to reduce the volume thereof. <P>SOLUTION: The chemical cleaning waste water containing a chelate compound and a compound which produces ammonia is separated to be stored in waste water tanks 1, 2, 3. Each of the waste water is concentrated in a reverse osmosis apparatus 4 (an RO apparatus), and permeating liquid is discharged while the concentrated liquid in the RO apparatus 4 is heated and dried in a heating/drying furnace 5 without controlling pH thereof, the dried waste being incinerated in an incinerator 7. The gas containing ammonia produced in the heating/drying furnace 5 is treated in a catalytic decomposition apparatus 6 with oxygen to decompose the ammonia into nitrogen and water. <P>COPYRIGHT: (C)2007,JPO&INPIT |
