Article: Treatment of drinking water containing iron using Electrocoagulation Journal: International Journal of Environmental Engineering (IJEE) 2010 Vol.2 No.1/2/3 pp.212 - 227 Abstract: Electrocoagulation (EC) technique was adopted for the treatment of iron containing drinking water using a reactor of 3 l capacity having 1 l liquid volume. Experimental investigation was carried out to observe the effect of different operating parameters such as pH, current density, inter-electrode distance and conductivity on the removal of iron from the iron-rich aqueous solution prepared with deionised water. Aluminium sheet was used as the electrode material and inter-electrode distance was varied from 0.005 m to 0.15 m. It was observed that 99% of iron was removed from the solution containing initial iron concentration of 5 mgl−1 at current density of 12.5 Am−2, solution conductivity of 0.4 Sm−1 and initial pH of 8 at the end of 25 min of EC. Solution pH was found to be an effective parameter for the efficient removal of iron. Conductivity of the iron-rich solution was improved with the addition of sodium chloride (NaCl), which increased the removal up to 99.4% for an initial iron concentration of 15 mgl−1. The optimum operating cost was evaluated as 0.285 US$ m−3 to remove 99% of iron from the solution with an initial iron concentration up to 10 mgl−1. Inderscience Publishers - linking academia, business and industry through research

Title: Treatment of drinking water containing iron using Electrocoagulation

Authors: D. Ghosh, C.R. Medhi, M.K. Purkait

Addresses: Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India. ' Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India. ' Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India

Abstract: Electrocoagulation (EC) technique was adopted for the treatment of iron containing drinking water using a reactor of 3 l capacity having 1 l liquid volume. Experimental investigation was carried out to observe the effect of different operating parameters such as pH, current density, inter-electrode distance and conductivity on the removal of iron from the iron-rich aqueous solution prepared with deionised water. Aluminium sheet was used as the electrode material and inter-electrode distance was varied from 0.005 m to 0.15 m. It was observed that 99% of iron was removed from the solution containing initial iron concentration of 5 mgl⁻¹ at current density of 12.5 Am⁻², solution conductivity of 0.4 Sm⁻¹ and initial pH of 8 at the end of 25 min of EC. Solution pH was found to be an effective parameter for the efficient removal of iron. Conductivity of the iron-rich solution was improved with the addition of sodium chloride (NaCl), which increased the removal up to 99.4% for an initial iron concentration of 15 mgl⁻¹. The optimum operating cost was evaluated as 0.285 US$ m⁻³ to remove 99% of iron from the solution with an initial iron concentration up to 10 mgl⁻¹.

Keywords: electrocoagulation; iron removal; current density; aluminium electrodes; inter-electrode distance; drinking water; water treatment; sodium chloride.

DOI: 10.1504/IJEE.2010.029829

International Journal of Environmental Engineering, 2010 Vol.2 No.1/2/3, pp.212 - 227

Published online: 02 Dec 2009 *

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Title: Treatment of drinking water containing iron using Electrocoagulation

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