Research of the Optimal H2O2/Fe2+ Ratios in Fenton and Photo-Fenton by Controlling DO and ORP

• Main Authors: Jing-Lan Huang, 黃靖嵐
• Other Authors: Ruey-Fang Yu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/25756652038941591033

碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 103 === The Fenton series processes are very popular and effective advanced oxidation processes (AOPs) for many industrial wastewater treatments, especially for the wastewaters. Fenton process and the Photo-Fenton process combined the advantages of photo-chemical and Fenton processes are therefore have been investigated for treating both organic and inorganic pollutants in many industrial wastewaters, and performed in a more effective capacity to degrade refractory organic materials with less sludge production and lower chemical requirements than the conventional Fenton process. For most industrial wastewater treatment processes, real-time regulation of the operational conditions, especially for chemical doses, depend upon the influent qualities and effluent targets critical to reducing operating costs. Most investigations on the Fenton series processes for industrial wastewater treatments used a fixed H2O2/Fe2+ ratio for the H2O2 dosage control. However, the required dosages for H2O2 are different not only for Fe2+ doses, but also for different types of wastewaters. The fixed H2O2/Fe2+ ratio is not appropriate for the dose control of Fenton series processes. According to our research the on-line monitoring DO and ORP profiles can indicate the surplus and accumulation of H2O2 caused by the continuous dosing of H2O2, which can help to identify over-dosing of H2O2 The DO and ORP profiles also have high correlations with the trends of H2O2, and Fe2+ variations. An optimal H2O2/Fe2+ ratio should be controlled before this DO/ORP increase.Therefore,controlling DO=2 (mg/l) was the optimal H2O2/Fe2+ ratio for different types of Fenton process control condition. Keywords: Fenton , Photo-Fenton, Dissolved Oxygen (DO), Oxidation Reduction Potential (ORP), H2O2/Fe2+ ratios, dyeing wstewater