The Effect of Fe(II), Fe(III), Al(III), Ca(II) and Mg(II) on Electrocoagulation of As(V)
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei City 106, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Alexandre T. Paulino and Sergi Garcia-Segura
Water 2022, 14(2), 215; https://doi.org/10.3390/w14020215
Received: 12 November 2021
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Revised: 6 January 2022
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Accepted: 11 January 2022
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Published: 12 January 2022
(This article belongs to the Section Wastewater Treatment and Reuse)
The interaction between metal chlorides and electrocoagulation was tested. Precipitation of As(V) was found to be optimal at pH 4.9 using FeCl2, 2.6 for FeCl3, 3.8 using AlCl3, 11.6 using CaCl2 and 8.6 using MgCl2. As(V) removal through electrocoagulation went down as initial pH (pHi) of the solution increased. Addition of FeCl2 increased removal of As(V) at all pHi but was not able to achieve full removal at pHi 7. FeCl3 had a similar effect but a lower Fe(III) concentration of 30 mg/L was not sufficient for full removal at pHi 5 either. AlCl3 addition reduced removal efficiency at pHi 3 but removed all or most As(V) through precipitation at pHi 5 and 7, with complete removal followed through electrocoagulation. The addition of CaCl2 and MgCl2 resulted in nearly identical behavior. Addition of either at pHi 3 had no influence, but at pHi 5 and 7 caused complete removal to take place.
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Keywords:
arsenic(V); electrocoagulation; precipitation; adsorption; wastewater; treatment; conductivity
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MDPI and ACS Style
Moed, N.M.; Ku, Y. The Effect of Fe(II), Fe(III), Al(III), Ca(II) and Mg(II) on Electrocoagulation of As(V). Water 2022, 14, 215. https://doi.org/10.3390/w14020215
AMA Style
Moed NM, Ku Y. The Effect of Fe(II), Fe(III), Al(III), Ca(II) and Mg(II) on Electrocoagulation of As(V). Water. 2022; 14(2):215. https://doi.org/10.3390/w14020215
Chicago/Turabian StyleMoed, Niels M., and Young Ku. 2022. "The Effect of Fe(II), Fe(III), Al(III), Ca(II) and Mg(II) on Electrocoagulation of As(V)" Water 14, no. 2: 215. https://doi.org/10.3390/w14020215
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