The O <sub> 3 </ Sub> / H <sub> 2 </ Sub> The O <sub> 2 </ Sub> Associated With Fenton Reagent Treatment Of Domestic Wastewater

The shortage of water sources is one of the most serious problems in the world which human being face to in 21st century, and so is in China. On the other hand, lots kinds of sewages were discharged into the environment every year in China , which the discharge of living sewage from cities was up to 50%. So it is very important for us to treat the living sewage and recycle to use it.In the article , based on primary and secondary grade biochemical treatment to the living sewage and according to the water standard of secondary grade discharge water , a better deep treatment process is searching for in order to get the zero discharge of living sewage and recycle to use it. In the process , secondary grade biochemical water was used as raw water and being treated by ozone, ozone-hydrogen peroxide solution and Fenton reagent individually.The studies showed that when the raw water was treated only by 2. 7mg/L of ozone for 15min and 30min , the removal rates of CODcr were up to 30. 4% and 34.6% respectively, the removal rates of volatile phenol were up to 99. 1% and 99. 5% respectively; when the concentration of ozone was changed to 5. 2mg/L, the removal rates of COD_Cr were up to 49. 0% and 54. 6% and the removal rates of volatile phenol were up to 99. 2% and 99. 5% respectively. When the raw water was treated by ozone-hydrogen peroxide solution with 2. 7mg/L of ozone and 50mg/L of 30% H₂O₂ for 15min, the removal rates of CODcr and volatile phenol were up to 53.8% and 99. 1% respectively. When the raw water was treated by Fenton reagent, the best process condition was achieved: pH=3. 0, 1. 50mL/L of 30% H₂O₂ and 2. 00mL/L of 10% FeSO₄ , in which the removal rates of COD_Cr and volatile phenol were up to 60. 8% and 54.9% respectively.The experiment results have proved that the process we studied worked stable , had high performance and could get suitable discharge water. Although its operation was a little complicated, we believe that the process can have good effects on the environment and get economic performances at the same time.