Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

doi:10.1016/j.cjche.2024.07.008

中国化学工程学报 ›› 2024, Vol. 75 ›› Issue (11): 266-273.DOI: 10.1016/j.cjche.2024.07.008

Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

Abdellatif Aarfane^1,2, Meryem Bensemlali², Abderrahmane Elmelouky³, Badreddine Hatimi², Soumia Zaim³, Nicole Jaffrezic-Renault⁴, Abdoullatif Baraket¹, Abdelhamid Errachid⁴, Monkade Mohamed³, Hamid Nasrellah^1,2

1. University Chouaib Doukkali, Higher School of Education and Training, El Jadida 999055, Morocco;
2. University Chouaib Doukkali, Faculty of Sciences, Laboratory of Organic Bioorganic Chemistry and Environmental, El Jadida 999055, Morocco;
3. University Chouaib Doukkali, Faculty of Sciences, Laboratory Physics of Condensed Matter (LPCM), El Jadida 999055, Morocco;
4. University of Lyon, Institute of Analytical Sciences-UMR 5280, Villeurbanne 69100, France

收稿日期:2024-03-04 修回日期:2024-05-20 接受日期:2024-07-15 出版日期:2024-11-28 发布日期:2024-08-23
通讯作者: Nicole Jaffrezic-Renault,E-mail:nicole.jaffrezic@univ-lyon1.fr
基金资助:
The authors acknowledge the financial support from POC4 allergies project (768686), which received funding from ERA PerMed ERA-NET, and the financial support from Bionanosens project (951887), which received funding from the European Union's Horizon 2020.

Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

1. University Chouaib Doukkali, Higher School of Education and Training, El Jadida 999055, Morocco;
2. University Chouaib Doukkali, Faculty of Sciences, Laboratory of Organic Bioorganic Chemistry and Environmental, El Jadida 999055, Morocco;
3. University Chouaib Doukkali, Faculty of Sciences, Laboratory Physics of Condensed Matter (LPCM), El Jadida 999055, Morocco;
4. University of Lyon, Institute of Analytical Sciences-UMR 5280, Villeurbanne 69100, France

Received:2024-03-04 Revised:2024-05-20 Accepted:2024-07-15 Online:2024-11-28 Published:2024-08-23
Contact: Nicole Jaffrezic-Renault,E-mail:nicole.jaffrezic@univ-lyon1.fr
Supported by:
The authors acknowledge the financial support from POC4 allergies project (768686), which received funding from ERA PerMed ERA-NET, and the financial support from Bionanosens project (951887), which received funding from the European Union's Horizon 2020.

摘要/Abstract

摘要： In order to treat the polluted discharge from El-Jadida, Morocco, a method of electrocoagulation using aluminum electrodes was used. This approach was coupled for the first time with high-frequency electrochemical impedance spectroscopy (EIS). Significant pollutant abatement was observed after 30 min, at a current density of 190.5 A·m^-2, with a specific electrical energy consumption of 1.58 kW·h (per gram of eliminated carbon organic demand (COD)) and specific aluminum consumption of 0.11 g ·g^-1: electrocoagulation proved to be particularly effective, achieving 85.7% elimination of COD and a decrease of total dissolved solid (TDS) and electrical conductivity (EC) levels from 2430 mg·L^-1 to 1773 mg·L^-1 and from 4230 μS·cm^-1 to 3210 μS·cm^-1, respectively. As for USP and ORP, they decreased from 2.5 to 1.87 and from 244.6 mV to 51 mV, respectively. The inductance of the electrocoagulation system measured by EIS was modeled through an electrical equivalent circuit. When the applied intensity increased, the coagulation resistance increased suddenly when the applied electrical current reached 0.2 A (current density: 95.2 A·m^-2). At this point, the rate of COD abatement versus SEEC (specific electrical energy consumption decreases which shows that the EC process should be combined with another process to improve its efficiency, such as ultrasound.

关键词: Wastewater treatment, Electrocoagulation process, Aluminum electrodes, Electrochemical impedance spectroscopy, Coagulation resistance, COD abatement rate

Abstract: In order to treat the polluted discharge from El-Jadida, Morocco, a method of electrocoagulation using aluminum electrodes was used. This approach was coupled for the first time with high-frequency electrochemical impedance spectroscopy (EIS). Significant pollutant abatement was observed after 30 min, at a current density of 190.5 A·m^-2, with a specific electrical energy consumption of 1.58 kW·h (per gram of eliminated carbon organic demand (COD)) and specific aluminum consumption of 0.11 g ·g^-1: electrocoagulation proved to be particularly effective, achieving 85.7% elimination of COD and a decrease of total dissolved solid (TDS) and electrical conductivity (EC) levels from 2430 mg·L^-1 to 1773 mg·L^-1 and from 4230 μS·cm^-1 to 3210 μS·cm^-1, respectively. As for USP and ORP, they decreased from 2.5 to 1.87 and from 244.6 mV to 51 mV, respectively. The inductance of the electrocoagulation system measured by EIS was modeled through an electrical equivalent circuit. When the applied intensity increased, the coagulation resistance increased suddenly when the applied electrical current reached 0.2 A (current density: 95.2 A·m^-2). At this point, the rate of COD abatement versus SEEC (specific electrical energy consumption decreases which shows that the EC process should be combined with another process to improve its efficiency, such as ultrasound.

Key words: Wastewater treatment, Electrocoagulation process, Aluminum electrodes, Electrochemical impedance spectroscopy, Coagulation resistance, COD abatement rate

Abdellatif Aarfane, Meryem Bensemlali, Abderrahmane Elmelouky, Badreddine Hatimi, Soumia Zaim, Nicole Jaffrezic-Renault, Abdoullatif Baraket, Abdelhamid Errachid, Monkade Mohamed, Hamid Nasrellah. Electrocoagulation efficiency probed using electrochemical impedance spectroscopy[J]. 中国化学工程学报, 2024, 75(11): 266-273.

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Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

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