Removal of Cd2+ and Ni2+ from water by electrocoagulation with aluminum electrode
Journal
Chinese Journal of Environmental Engineering
Journal Volume
10
Journal Issue
6
Pages
2855-2861
Date Issued
2016
Author(s)
Abstract
The removal of Cd2+ and Ni2+ from simulated wastewater contaminated by heavy metals through electrocoagulation was investigated using aluminum electrode. Effects of current density, reaction time, pH, and electrode distance on the removal efficiency were tested. Under optimum operational conditions, the removal rates of Cd2+ and Ni2+ could reach 99.99%. Sodium dodecyl sulfonate (SDS) (5.0 mg/L) was added to the simulated wastewater; compared with the process with no SDS addition, during the process of Cd2+ removal, the current efficiency increased from 101.4% to 108.0%. The reaction time could reduce from 12 min to 10 min for the same removal rate of 99.52%, as for the Ni2+ removal process, compared to reaction time reduction from 10 min to 8 min for the same removal rate of 98.61% with no SDS addition. Both the processes could be simulated with first-order models. Scanning electron microscopy (SEM) images of the anode's surface indicated that the addition of SDS was conducive to the release of Al3+.
SDGs
Type
journal article