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Technologica Acta : Scientific/professional journal of chemistry and technology, Vol. 15 No. 1, 2022.

Other

https://doi.org/10.5281/zenodo.6918321

Electrochemical removal of hexavalent chromium by electrocoagulation

Borislav N. Malinovic orcid id orcid.org/0000-0003-3161-5115 ; Faculty of Technology, University of Banja Luka, Stepe Stepanovica 73, 78000 Banja Luka, Bosnia and Herzegovina
Tijana Djuricic orcid id orcid.org/0000-0002-1502-7498 ; Faculty of Technology, University of Banja Luka, Stepe Stepanovica 73, 78000 Banja Luka, Bosnia and Herzegovina
Dajana Dragic orcid id orcid.org/0000-0002-1502-7498 ; Faculty of Technology, University of Banja Luka, Stepe Stepanovica 73, 78000 Banja Luka, Bosnia and Herzegovina
Rade Malesevic orcid id orcid.org/0000-0002-1502-7498 ; Faculty of Technology, University of Banja Luka, Stepe Stepanovica 73, 78000 Banja Luka, Bosnia and Herzegovina
Drazenko Bjelic ; JP Dep-ot, Bulevar Zivojina Misica 23, 78000 Banja Luka, Bosnia and Herzegovina

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Abstract

Chromium in wastewater is discharged from tannery, electroplating, metal finishing, dying industry and many other industries. Presence of hexavalent chromium (Cr(VI)) in the environment considerable concern because it is non-biodegradable, highly toxic and carcinogen. There are several treatments for the removal of chromium from wastewater, but the most common method involves reduction to its less toxic trivalent state. In this paper electrocoagulation was used as treatment for removing of hexavalent chromium from synthetic prepared wastewater initial concentration 50 mg/L, in presence of sodium chloride as supporting electrolyte (1 g/L). The treatment was perform in a batch electrochemical reactor 250 mL capacity and with possibility of constant stirring. It was examined the impact of electrode materials and current density (5, 10, 20 mA/cm2) on Cr(VI) removal efficiency. The examination showed that iron has higher removal efficiency compared to aluminium. Also, it was observed high efficiency at very begin of treatment and at low current density. For 20 minutes of treatment it was achieved almost complete Cr(VI) removal at current density of 5 mA/cm2 by using iron electrodes (E= 99.8 %).

Keywords

removal efficiency,current density,irone anode

Hrčak ID:

294685

URI

https://hrcak.srce.hr/294685

Publication date:

30.6.2022.

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