Journal
CHEMICAL ENGINEERING JOURNAL
Volume 349, Issue -, Pages 358-367Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.05.099
Keywords
Wastewater treatment; Zinc removal; Electrocoagulation; Cathodic reduction; Kinetics
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Funding
- U.S. Department of Energy National Energy Technology Laboratory [DE-FE0026315]
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In this work, the research focused on the Zn2+ removal from the synthetic wastewater by electrocoagulation (EC) with aluminum electrodes. The effects of current density (2.1-12.5 mA/cm(2) ), initial concentration (50-2000 mg/L), solution pH (2.9-7.4) and conductivity (0.15-14.11 mS/cm) on the removal efficiency and energy consumption were systematically investigated. It indicated that Zn2+ removal efficiency increased with the increasing of current density and residence time. With a relatively low energy consumption of 0.35 kWh/m(3), all of Zn2+ (50 mg/L) was removed in 20 min EC treatment, 8.3 mA/cm 2 for current density, and 5.3 for pH. With an energy consumption of 0.88 kWh/m(3), all of Zn2+ (250 mg/L) were removed in 50 min. In addition, kinetic study was applied to analyze Zn2+ removal rate at different current densities and initial concentrations. Different mechanisms of Zn2+ removal were implied by comparing the results of low initial concentration (<= 250 mg/L) and high one (>= 500 mg/L). It was reasonable to conclude that, besides the precipitation effect of aluminum hydroxide flocculation, electrochemical reduction of Zn2+ at the cathode also contributed to Zn2+ removal, especially at a high initial concentration.
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