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Treatment of tannery wastewater by electrocoagulation

Journal of Environmental Sciences 2007年第12期19卷 1409-1415页

作者： FENG Jing-wei SUN Ya-bing ZHENG Zheng ZHANG Ji-biao LI Shu TIAN Yuan-chun State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

Treatment of tannery wastewater by electrocoagulation with low cell current （≤ 1A） and soluble electrodes （mild steel electrodes and aluminum electrodes） was studied. Compared with aluminum electrodes, mild steel electrodes were more effective for the removal of sulfide, with a removal efficiency of over 90%. But during the treatment process, black color precipitate typical to iron（Ⅱ） sulfides was produced. While aluminum electrodes were effective to eliminate the colority of the effluent, the removal efficiency of sulfide was lower than 12%. The mechanisms of the removal of chemical oxygen demand, ammonia, total organic carbon, sulfide and colority with the two soluble electrodes （mild steel and aluminum electrodes） were discussed in detail. In order to exert the predominance of diffenent types of electrodes, the tannery wastewater was treated using mild steel electrodes first followed by the filter and finally by the aluminum electrodes, the elimination rates of chemical oxygen demand, ammonia, total organic carbon, sulfide and colority were 68.0%, 43.1%, 55.1%, 96.7% and 84.3%, respectively, with the initial concentrations 2413.1 mg/L, 223.4 mg/L, 1000.4 mg/L, 112.3 mg/L and 256 dilution times, respectively. The absorbance spectra and energy consumption during electrocoagulation process were also discussed.

关键词： tannery wastewater electrocoagulation mild steel electrodes aluminum electrodes

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Electrocoagulation efficiency probed using electrochemical impedance spectroscopy

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Chinese Journal of Chemical Engineering 2024年第11期75卷 266-273页

作者： Abdellatif Aarfane Meryem Bensemlali Abderrahmane Elmelouky Badreddine Hatimi Soumia Zaim Nicole Jaffrezic-Renault Abdoullatif Baraket Abdelhamid Errachid Monkade Mohamed Hamid Nasrellah University Chouaib Doukkali Higher School of Education and TrainingEl Jadida 999055Morocco University Chouaib Doukkali Faculty of SciencesLaboratory of Organic Bioorganic Chemistry and EnvironmentalEl Jadida 999055Morocco University Chouaib Doukkali Faculty of SciencesLaboratory Physics of Condensed Matter(LPCM)El Jadida 999055Morocco University of Lyon Institute of Analytical Sciences e UMR 5280Villeurbanne 69100France

In order to treat the polluted discharge from El-Jadida,Morocco,a method of electrocoagulation using aluminum electrodes was *** approach was coupled for the first time with high-frequency electrochemical impedance spectroscopy(EIS).Significant pollutant abatementwas 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 4230μS·cm^(-1)to 3210μS·cm^(-1),*** for USP and ORP,they decreased from 2.5 to 1.87 and from 244.6 mV to 51 mV,*** inductance of the electrocoagulation system measured by EIS was modeled through an electrical equivalent *** 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

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