| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently treat wastewater containing a reducing agent and a degradation-retarded organic substance. SOLUTION: A ferric salt is added to and mixed with the wastewater in an iron treating tank 10 to oxidize the reducing agent. The wastewater thus obtained containing bivalent iron is led into a hydrogen peroxide treatment tank 12, and then the Fenton's oxidation is carried out by adding hydrogen peroxide to degrade the degradation-retarded organic substance. Then, the wastewater is neutralized to pH 7.0, and iron hydroxide is deposited and removed in a settling tank 14, and a biological treatment is conducted in a biological treatment tank 16. The reducing agent is removed in the iron treatment tank 10 and the degradation-retarded organic substance is degraded into an easily degradable organic substance in the hydrogen peroxide treatment tank 12, and thereby an effective treatment is possible in the biological treatment tank 16.</p> |
