Treatment for petrochemical wastewater by ozone oxidation-biological filter coupling process
In order to solve the problem that the chemical oxygen demand(COD)of petrochemical wastewater was difficult to be reduced below 60 mg/L by the traditional treatment process,the coupling process of ozone oxidation and biological filter was added to the biochemical treatment unit,and the wastewater in a petrochemical industrial park was further treated.The effects of the process on the COD removal rate and ozone oxidation efficiency were in-vestigated.The results showed that ozone oxidation-biological filter coupling process improved the chance of oxidative degradation of macromolecular organic matter in wastewater by ozone,with an aver-age COD removal rate of 63％and a maximum re-moval rate up to 75％.The effluent COD was stable below 30 mg/L,meeting the local ultra-clean dis-charge standard.The mean ozone oxidation efficien-cy was 1.1,which was much higher than that of the ozone oxidation process alone.
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维普
