Journal
HYDROMETALLURGY
Volume 202, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2021.105596
Keywords
Electrocoagulation (EC); Metallurgical industry wastewater; Residual metal concentrations; Continuous EC system; Pilot scale study
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Funding
- SME-MET IMCEE project (The Finnish Funding Agency for Technology and Innovation, TEKES)
- PoDoCo (Post Docs in Companies) program
- Jenny and Antti Wihuri Foundation
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Laboratory scale batch EC experiments conducted on real metallurgical industry wastewater showed that under specific process conditions, electrolysis treatment can effectively remove pollutants with low operating costs and energy consumption.
Laboratory scale batch EC experiments were performed on real metallurgical industry wastewater (MIWW). The most suitable process conditions were found to be: Al anode, a current of 1.05 A (150 A/m(2)) and a treatment time of 5 min (175 C/L). Operating costs and electrical energy consumption values were very low, 0.065 (sic)/m(3) and 0.44 kWh/m(3), respectively. In the most suitable process conditions, 96% of turbidity, 92% of TSS, 87% of Al-tot, 99.9% of Cr, 99.6% of Zn, and 96% of COD could be removed from MIWW. Filtration tests showed that filter size had a significant effect on the residual metal content, and less than 10% of the Al, was in a dissolved form. Similar results were obtained for both Fe and Al anodes. Test runs with a novel pilot-scale continuous EC system were also conducted. These results were well in line with the batch experiments. To obtain the best possible results in the treatment of MIWW, the continuous EC treatment system needs to be followed by a settling or filtration step. The results obtained in this work were repeatable. To conclude, EC was shown to be a feasible technology for the treatment of real MIWW.
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