Capacitive deionization of arsenic-contaminated groundwater in a single-pass mode
Journal
Chemosphere
Journal Volume
184
Pages
924-931
Date Issued
2017
Author(s)
Abstract
A single-pass-mode capacitive deionization (CDI) reactor was used to remove arsenic from groundwater in the presence of multiple ions. The CDI reactor involved an applied voltage of 1.2 V and six cell pairs of activated carbon electrodes, each of which was 20 × 30 cm2. The results indicate that this method achieved an effluent arsenic concentration of 0.03 mg L−1, which is lower than the arsenic concentration standard for drinking water and irrigation sources in Taiwan, during the charging stage. Additionally, the ability of the CDI to remove other coexisting ions was studied. The presence of other ions has a significant influence on the removal of arsenic from groundwater. From the analysis of the electrosorption selectivity, the preference for anion removal could be ordered as follows: NO3− > SO42− > F− > Cl− >As. The electrosorption selectivity for cations could be ordered as follows: Ca2+ > Mg2+ > Na+ ∼ K+. Moreover, monovalent cations can be replaced by divalent cations at the electrode surface in the later period of the electrosorption stage. Consequently, activated carbon-based capacitive deionization is demonstrated to be a high-potential technology for remediation of arsenic-contaminated groundwater. © 2017 Elsevier Ltd
Subjects
Activated carbon; Arsenic; Capacitive deionization; Groundwater; Selective electrosorption
SDGs
Other Subjects
Activated carbon; Arsenic; Effluents; Electrodes; Groundwater; Groundwater pollution; Positive ions; Potable water; Remediation; Activated carbon electrode; Arsenic concentration; Capacitive deionization; Contaminated groundwater; Electrode surfaces; Electrosorption; Monovalent cations; Removal of arsenics; Chemicals removal (water treatment); activated carbon; anion; arsenic; calcium ion; cation; divalent cation; drinking water; ground water; ion; magnesium ion; monovalent cation; potassium ion; sodium ion; arsenic; charcoal; ground water; water pollutant; activated carbon; arsenic; concentration (composition); drinking water; electrode; groundwater pollution; instrumentation; pollutant removal; remediation; sorption; Article; capacitive deionization; desalination; desorption; electric potential; electrode; ionization; pH; Taiwan; water contamination; water quality; analysis; procedures; water management; water pollutant; Taiwan; Arsenic; Cations, Divalent; Cations, Monovalent; Charcoal; Electrodes; Groundwater; Ions; Taiwan; Water Pollutants, Chemical; Water Purification
Type
journal article