TREATMENT OF IRON-CYANIDE COMPLEX CONTAINING CYANIC WASTE WATER

摘要

PROBLEM TO BE SOLVED: To treat a cyanide in a waste water to low concn. by irradiating the waste water with UV rays to visible rays after adding sulfuric acid, a soluble sulfate and an oxidizing agent to execute a decomposition and oxidation treatment of an iron-cyanide complex at the time of treating a cyanic waste water containing the iron-cyanide complex. ;SOLUTION: The cyanic waste water is irradiated with UV rays-visible rays in a reactor 16 provided with a light source 15 after adding sulfuric acid or sulfuric acid and the soluble sulfate and the oxidizing agent to the cyanic waste water containing the iron-cyanide complex from a feed device 12. In this way, a decomposition and oxidation treatment of the iron-cyanide complex is allowed to progress by a two step reaction. That is, at the first step reaction, the iron-cyanide complex is excited by light energy to be decomposed to a free cyanide and iron ion. At the second step reaction, the free cyanide is oxidized with the oxidizing agent supplied from an oxidizing agent feed device 13 to convert it into a carbonate and nitrogen. The waste water with cyanide compd. decomposed and oxidized is discharged from a discharge pipe 17 as a treated water.;COPYRIGHT: (C)1998,JPO