首页|Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

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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 elec-trochemical 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.

Wastewater treatmentElectrocoagulation processAluminum electrodesElectrochemical impedance spectroscopyCoagulation resistanceCOD abatement rate

Abdellatif Aarfane、Meryem Bensemlali、Abderrahmane Elmelouky、Badreddine Hatimi、Soumia Zaim、Nicole Jaffrezic-Renault、Abdoullatif Baraket、Abdelhamid Errachid、Monkade Mohamed、Hamid Nasrellah

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University Chouaib Doukkali,Higher School of Education and Training,El Jadida 999055,Morocco

University Chouaib Doukkali,Faculty of Sciences,Laboratory of Organic Bioorganic Chemistry and Environmental,El Jadida 999055,Morocco

University Chouaib Doukkali,Faculty of Sciences,Laboratory Physics of Condensed Matter(LPCM),El Jadida 999055,Morocco

University of Lyon,Institute of Analytical Sciences-UMR 5280,Villeurbanne 69100,France

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2024

10.1016/j.cjche.2024.07.008

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.75(11)