Arsenic removal from groundwater by horizontal-flow continuous electrocoagulation (EC) as a standalone process. Issue 1 (February 2018)

• Record Type: Journal Article
• Authors: Mohora, Emilijan; Rončević, Srdjan; Agbaba, Jasmina; Zrnić, Kristiana; Tubić, Aleksandra; Dalmacija, Božo
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 1(2018)
• Page Start: 512
• Page End: 519
• Publication Date: 2018-02
• Subjects: Continuous -flow electrocoagulation -- Groundwater -- Arsenic removal -- Electrode passivation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2017.12.042
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In this study, laboratory scale experiments were conducted with the horizontal continuous-flow EC reactor as a standalone technology with the capacity of 300 L/day with iron (Fe) plate bipolar electrodes to assess its efficiency in the removal of arsenic from raw groundwater without pre- and post-treatment pH modification of groundwater. The optimum EC reactor operating conditions were determined to be current density of 1.98 A/m 2, charge loading of 54 C/L, flow rate of 12 L/h. The EC reactor was able to remove 96% of arsenic from raw groundwater and met respective World Health Organization (WHO) guideline value of 10 μg As/L within the 4 h experimental runs. The Fe electrode polarity change at 30 min successfully controlled passivation of Fe electrodes and enabled a steady reactor operation with the high As removal efficiency. Residual Fe concentration in treated groundwater was in the range 0.17 ± 0.07 mg/L and met WHO guideline value for drinking water. The preliminary estimated operating cost at the optimum operating conditions was 0.0135 €/m 3 .