Electrochemical treatment of carwash wastewater using Fe and Al electrode: Techno-economic analysis and sludge characterization
| Autor: | Z. Beril Gönder, Yasemin Kaya, Ilda Vergili, Gökhan Balcıoğlu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Materials science medicine.medical_treatment Analytical chemistry Industrial Waste 02 engineering and technology Wastewater 010501 environmental sciences Management Monitoring Policy and Law Electrochemistry Waste Disposal Fluid 01 natural sciences Chloride Electrocoagulation Zeta potential medicine Fourier transform infrared spectroscopy Electrodes Waste Management and Disposal 0105 earth and related environmental sciences Sewage Chemical oxygen demand General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Electrode 0210 nano-technology medicine.drug |
| Zdroj: | Journal of Environmental Management. 200:380-390 |
| ISSN: | 0301-4797 |
| Popis: | The present study was conducted to investigate the electrochemical treatment of carwash wastewater using electrocoagulation (EC) process with Fe and Al electrodes. The effects of operating conditions such as initial pH (2–10), current density (0.1–5 mA/cm 2 ) and operating time (5–50 min) on chemical oxygen demand (COD), oil-grease, chloride removal efficiencies as well as total operating costs were studied. The optimum conditions that achieve higher removal efficiencies were found as pH: 8, current density: 3 mA/cm 2 , operating time: 30 min for Fe electrode and pH: 6, current density: 1 mA/cm 2 , operating time: 30 min for Al electrode. The removal efficiencies for COD, oil-grease and chloride were obtained as 88%, 90% and 50% for Fe and 88%, 68% and 33% for Al electrodes under the optimum conditions. The total operating costs at the optimum conditions were calculated as 0.6 $/m 3 and 0.3 $/m 3 for Fe and Al electrodes, respectively. The sludge samples generated after EC process were characterized with Fourier transform infrared (FTIR) spectroscopy and zeta potential measurements for both electrodes. The analyses showed the presence of hydroxides and oxyhydroxides in the sludge samples and the surface of the sludge samples was negatively charged in the wide range of pH. As a conclusion, this study revealed that EC process using Fe electrode should be a feasible technology for higher COD and oil-grease removals from carwash wastewaters. |
| Databáze: | OpenAIRE |
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