Comparative study of electrocoagulation and electrochemical Fenton treatment of aqueous solution of benzoic acid (BA): Optimization of process and sludge analysis

Benzoic acid containing synthetic solution was pretreated by acid precipitation at various pH (1-3) and temperature (15-60 °C). Pre-treated solution was further treated by electrocoagulation (EC) and electrochemical Fenton (EF) processes using iron anode and graphite cathode. Optimization of indepen...

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Bibliographic Details
Published in:The Korean journal of chemical engineering 2017, 34(4), 205, pp.1062-1072
Main Authors: Sandhwar, Vishal Kumar, Prasad, Basheshwer
Format: Article
Language:English
Subjects:
Aqueous solutions
Benzoic acid
Biotechnology
Catalysis
Chemical oxygen demand
Chemistry
Chemistry and Materials Science
Comparative studies
Current density
Differential thermal analysis
Electrocoagulation
Electrolysis
Energy consumption
Environmental Engineering
Hydrogen peroxide
Industrial Chemistry/Chemical Engineering
Materials Science
Optimization
Response surface methodology
Sludge
화학공학
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Summary:Benzoic acid containing synthetic solution was pretreated by acid precipitation at various pH (1-3) and temperature (15-60 °C). Pre-treated solution was further treated by electrocoagulation (EC) and electrochemical Fenton (EF) processes using iron anode and graphite cathode. Optimization of independent operating parameters, namely, initial pH: (3-11), current density (A/m 2 ): (15.24-76.21), electrolyte concentration (mol/L): (0.03-0.07) and electrolysis time (min): (15-95) for EC process and pH: (1-5), current density (A/m 2 ): (15.24-76.21), H 2 O 2 concentration (mg/L): (100-500) and electrolysis time (min): (15-95) for EF process, was performed using central composite design (CCD) in response surface methodology (RSM). Maximum removal efficiencies of BA- 76.83%, 88.50%; chemical oxygen demand (COD) - 69.23%, 82.21% and energy consumption (kWh/kg COD removed) - 30.86, 21.15 were achieved by EC and EF processes, respectively, at optimum operating conditions. It was found that EF process is more efficient than EC process based on removal of BA and COD with lower energy consumption. The sludge obtained after EC and EF treatments was analyzed by XRD, FTIR, DTA/TGA and SEM/EDX techniques.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-016-0343-8