Optimization of electro-Fenton oxidation of biologically pretreated coal gasification wastewater by response surface methodology. Issue 18 (14th April 2016)

• Record Type: Journal Article
• Authors: Hou, Baolin; Ma, Wencheng; Han, Hongjun; Xu, Peng; Zhuang, Haifeng; Jia, Shengyong; Li, Kun
• Is Part Of: Desalination and water treatment. Volume 57:Issue 18(2016)
• Page Start: 8174
• Page End: 8182
• Publication Date: 2016-04-14
• Subjects: Electro-Fenton -- Response surface methodology -- Central composite design -- Coal gasification wastewater; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1018330
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: The response surface methodology coupled with central composite design was applied to optimize the operational parameters of electro-Fenton (EF) as advanced treatment of biologically pretreated coal gasification wastewater. The integration of TOC, COD, and total phenols removal was selected as the response for model establishment and optimization. A quadratic model with high significance was developed to predict the treatment performance and optimize process parameters. The optimal parameters were determined as pH 3.83, 1.44 mmol L −1 of Fe 2+ concentration, and 16.28 mA cm −2 of current density, with the predicted optimal integration removal efficiency of 73.29%. TOC decay in the EF under optimal condition followed pseudo-first-order kinetic reaction with the apparent rate constant of 0.0103 min −1 . The mass transfer constant was determined to be 4.29 × 10 −5 m s −1 at the optimal current density. The results demonstrated that EF could serve as a technically feasible and cost-effective method with potential applications for the advanced treatment of biologically stabilized coal gasification wastewater.