| 摘要 |
PURPOSE:To efficiently remove a harmful component, by treating a high concn. waste solution in the order of decomposition-oxidation-flocculation without diluting the same. CONSTITUTION:In the treatment of a waste solution containing a hypophosphite ion, at first, a transition metal belonging to the Group VIII or a compound thereof is used as a catalyst to perform the decomposition treatment of said waste solution to isolate, sediment and remove a metal component. Next, the hypophosphite ion is oxidized to a phosphite ion to facilitate oxidation by sodium hypochlorite and flocculative sedimentation by calcium hydroxide in the succeeding process. By this method, the treated liquid good in solid-liquid separability is obtained while the filtrate is cooled and oxidized again to remove COD in a high degree. |
