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Pretreatment of low biodegradable of petrochemical wastewater with Fenton oxidation
HE ShiLong 1,2;GAO YingXin2;YANG Min2;WANG LiPing1;ZHANG Jie1
Journal of Beijing University of Chemical Technology ›› 2009, Vol. 36 ›› Issue (3) : 87-91.
PDF(879 KB)
PDF(879 KB)
Pretreatment of low biodegradable of petrochemical wastewater with Fenton oxidation
HE ShiLong 1,2;GAO YingXin2;YANG Min2;WANG LiPing1;ZHANG Jie1
Pre-treatment using Fenton oxidation of nitrobenzene (NB)-bearing wastewater from dye manufacturing has been studied with the objective of removing NB and related aromatic compounds, and thereby improving the biodegradability of the wastewater. Under the conditions of initial pH value of 3, concentration of H2O2of 500mg/L, weight ratio of H2O2 to Fe 2+of 6, and reaction time of 150min, NB was almost completely transformed, and the ratio of BOD to COD was increased from 0.03 to 0.47. The redox potential (ORP) was found to be an effective indicator to monitor the Fenton oxidation process. H2O2 was almost depleted at the point where the ORP reached the maximal value, and minimum ORP value corresponded to the completion of Fenton oxidation. The increase in biodegradability continued for about 60min after the depletion of H2O2, suggesting the presence of an unknown oxidizing species.
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