Application of Response Surface Methodology for analysis and optimization of the operational parameters for turbidity removal from oily wastewater by electrocoagulation process

International Conference on Materials Engineering and Science

Mohammed, Thamer Jasim^1 ; Al-Zuheri, Hadeel Atiya^1

Chemical Engineering Department, University of Technology, Baghdad, Iraq^1

关键词: Central composite designs;    Electro coagulations;    Experimental values;    NaCl concentration;    Operational parameters;    Probability of errors;    Quadratic equations;    Response surface methodology;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/454/1/012069/pdf
DOI  :  10.1088/1757-899X/454/1/012069

来源: IOP

【 摘 要 】

The purpose of this work was to study the effectiveness of electrocoagulation process for turbidity removal from oily wastewater. Synthetic oily wastewater was used for conducting batch experiments, and the turbidity introduced to the wastewater by (0.3 gm) of Sodium Bentonite giving an initial turbidity of (200 NTU). Anode of aluminum and cathode of Iron were immersed in 1.5 L solution. An experimental design of (52 run) based on a central composite design (CCD), and the analyze of data was carried out using response surface methodology (RSM) in (Design Expert software) for evaluating the effect and interaction of several parameters including: initial pH (5-9), initial oil concentration (50-500 ppm), current density (5-25 mA/cm2), NaCl concentration (40-400 ppm), and electrolysis time (10-30 min). The response variable was Turbidity%. The experimental results were fitted to a quadratic equation and analysis of variance (ANOVA) was also performed. Results of the ANOVA showed that the model fitted well with turbidity% giving less than 0.05 of probability of error (p), and the variables had a significant effect on the removal. The high R-squared of 88% indicate the high correlation between the predicted and experimental values. In addition, the estimated optimum conditions of the treatment system were (pH= 6, [oil]= 387.5 ppm, Current density= 20 mA/cm2, [NaCl]= 310 ppm, and time= 25 min) giving a predicted turbidity% of 98% and experimental of 97.4%.