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Modeling and optimizing of electrocoagulation process in treating phenolic wastewater by response surface methodology: precise evaluation of significant variables

  • T. Karami
  • S. Elyasi
  • T. Amani
Original Paper
  • 88 Downloads

Abstract

The present work reports treatment of synthetic phenolic wastewater by electrocoagulation process. Aluminum flat sheets were utilized as electrodes. Central composite design combined with response surface methodology has been applied for optimizing the process parameters. The interaction effects of phenol concentration, electrode distance, pH, voltage, and electrolysis time (ET) were analyzed and correlated to assess the efficiency of phenol removal as process response. The ANOVA outcomes declared that the initial phenol concentration (relevant coefficient = −3.44) and ET (relevant coefficient = 1.42), respectively, are the most and the least effective parameters on the efficiency of phenol removal. Furthermore, optimal factors were obtained as follows: influent phenol concentration = 14.23 mg/L, electrode distance = 2.20 cm, pH = 6.37, voltage = 16.46 V, and electrolysis time = 44.66 min, in which the percentage of phenol removal at this condition was about 90.6%.

Keywords

Aluminum electrode Electrocoagulation process Modeling Optimization Phenolic wastewater treatment Response surface methodology (RSM) 

Abbreviations

Adj. R2

Adjusted R2

ANOVA

Analysis of variance

AP

Adequate precision

CCD

Central composite design

COD

Chemical oxygen demand

CV

Coefficients of variation

EC

Electrocoagulation

ED

Electrode distance

ET

Electrolysis time

R2

Determination coefficient

RSM

Response surface methodology

SD

Standard deviation

Notes

Acknowledgements

The authors would like to thank the water treatment plant located in Nanaleh County of Sanandaj, Iran, and also Miss Haleh Nourizadeh and Mr. Kamel Rouzrokh for their kind cooperation. Furthermore, the authors are grateful to State-Ease, Minneapolis, MN, USA, for the provision of the Design-Expert package.

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Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  1. 1.Chemical Engineering Department, Faculty of EngineeringUniversity of KurdistanSanandajIran

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