Fenton pre-treatment of wastewater containing nitrobenzene using ORP for indicating the endpoint of reaction
Because of their high toxicity and refractory to microorganisms, high concentration aromatic compounds like nitrobenzene (NB) have long been considered to be disadvantageous to stable operation of biological wastewater treatment systems in petrochemical industries. The pre-treatment of NB-bearing dye producing wastewater using Fentons oxidation was studied with the objective to remove NB and related aromatic compounds, and therefore improve the biodegradability of wastewater. Under the conditions of initial pH=3, H2O2=500 mg l-1, H2O2/Fe2+ (in weight) =6, and reaction time =150 min, the BOD/COD ratio of wastewater was increased from 0.03 to 0.47. The redox potential (ORP) was found to be an effective indicator to monitor the Fentons oxidation process. H2O2 was almost depleted at the point where the ORP reached the maximal value, and the lowest point of ORP was accompanied with the completion of Fentons oxidation and the maximal BOD/COD. Increase of biodegradability continued for about 60 min even after the depletion of H2O2, suggesting the existence of some unknown oxidizing species.
Fentons ozidation dye producing wastewater nitrobenzene redoz potential biodegradability
He Shi-long Wang Li-ping Zhang Jie Hou Mei-feng
School of Environment and Spatial Informatics, China University of Mining & Technology, Xuzhou 221116, China
国际会议
The 6th International Conference on Mining Science & Technology ICMST 2009(第六届国际矿业科学技术大会)
徐州
英文
1-8
2009-10-18（万方平台首次上网日期，不代表论文的发表时间）