Influence of Flow Rate on the Removal of Copper, Lead and Nickel From Solutions in Electrodialysis Process

Aytaç, Ersin; Altin, Sureyya

doi:10.20319/mijst.2017.33.2435

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The results shown in Figure 5a revealed that HM concentrations higher than 30 mg/L negatively affect the process in terms of HM removal efficiency. The results obtained from this work showed higher HM removal efficiencies (above 98%) for ED than those reported in the literature [8,12,14,35]. According to the mass balance evaluation, only 1-10% of the removed HMs was transferred to the concentrate compartment.…”

Section: Impact Of the Hm Feed Concentrationcontrasting

confidence: 48%

“…It is a challenging task to remove such dissolved contaminants, and current technologies often need to be operated in multiple stages to achieve effective removal. Current treatment technologies for the removal of HMs and other compounds include adsorption [5], flocculation, ion exchange [6][7][8], membrane filtration such as nanofiltration (NF) and reverse osmosis (RO) [9][10][11] and electromembrane processes such as electrodialysis (ED) [12][13][14], bipolar membrane electrodialysis (BMED) [15,16], and electrodeionization (EDI) [17,18]. The limitations of these technologies are their high operating costs and only partial removal, especially for marginally polluted brackish groundwater/surface water or industrial effluents.…”

Section: Introductionmentioning

confidence: 99%

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Heavy Metal Removal from Aqueous Solutions Using a Customized Bipolar Membrane Electrodialysis Process

Bunani,

Abbt-Braun,

Horn

2024

Molecules

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Lack of safe water availability and access to clean water cause a higher risk of infectious diseases and other diseases as well. Heavy metals (HMs) are inorganic pollutants that cause severe threats to humans, animals, and the environment. Therefore, an effective HM removal technology is urgently needed. In the present study, a customized bipolar membrane electrodialysis process was used to remove HMs from aqueous solutions. The impacts of the feed ionic strength, applied electrical potential, and the type and concentration of HMs (Cd2+, Co2+, Cr3+, Cu2+, and Ni2+) on the process performance were investigated. The results showed that feed solution pH changes occurred in four stages: it first decreased linearly before stabilizing in the acidic pH range, followed by an increase and stabilization in the basic range of the pH scale. HM speciation in the basic pH range revealed the presence of anionic HM species. The presence of HMs on anion exchange membranes confirmed the contribution of these membranes for HM removal in the base channels of the process. While no clear trend was seen in the ionic strength solution, the maximum HM removal was observed when 1.5 g/L NaCl was used. The initial HM concentration showed a linear increase in HMs removal of up to 30 mg/L. A similar trend was seen with an increase in the applied electrical potential of up to 15 V. In general, the amount of HMs removed increased in the following order: Cd2+ ˃ Ni2+ ˃ Co2+ ˃ Cu2+ ˃ Cr3+. Under some operational conditions, however, the removed amount of Cu2+, Co2+, and Ni2+ was similar. The mass balance and SEM-EDX results revealed that the removed HMs were sorbed onto the membranes. In conclusion, this process efficiently separates HMs from aqueous solutions. It showed the features of diluate pH adjustment, reduction in the overall stack electrical resistance, and contribution of anion exchange membranes in multivalent cation removal. The mechanisms involved in HMs removal were diffusion and migration from the bulk solution, followed by their sorption on both cation and anion exchange membranes.

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Section: Impact Of the Hm Feed Concentrationcontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Heavy Metal Removal from Aqueous Solutions Using a Customized Bipolar Membrane Electrodialysis Process

Bunani,

Abbt-Braun,

Horn

2024

Molecules

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Removal of Chromium ions (Cr6+) and Nickel ions (Ni2+) from Simulated Industrial Wastewater Using Flow-by-Porous Electrode

Kamel,

Bastaweesy

2024

Water Air Soil Pollut

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The quality of water is significantly impacted by the presence of Cr6+ and Ni2+ ions. This study investigates the effectiveness of a flow-by porous graphite electrode cell in removing these contaminants from simulated industrial wastewater. We explore the impact of various factors on the removal process, demonstrating the method's potential for efficient removal. The initial concentration of nickel and chromium ions (20 to 80 mg/l and 20 to 100 mg/l, respectively), the feed flow rate (0.28 to 1.11 ml/s), current density (0.2 to 2.25 mA/cm2) and pH all influence the removal rate and efficiency. A higher feed flow rate negatively affects the removal efficiency of both Ni2+ and Cr6+ ions. Nickel removal efficiency decreased by 34.9% at 20 ppm and 26% at 80 ppm, representing the highest and lowest reductions in efficiency, respectively. Chromium removal efficiency decreased by 19% at 100 ppm and 6.5% at 50 ppm, indicating the highest and lowest reductions in efficiency, respectively, under the same flow rate change. Under optimal conditions, the removal efficiency for Ni2+ was 99.47% after 15 min of operation at a current density of 1.96 mA/cm2, a flow rate of 0.28 ml/s, and a pH of 8 and the removal efficiency for Cr6+ was 99.97% after 10 min of operation at a current density of 2.25 mA/cm2, a flow rate of 0.28 ml/s, and a pH of 2. The flow-through porous electrode system achieves efficient heavy metal removal with operating costs of 0.24 USD/m3 for nickel and 0.38 USD/m3 for chromium at optimal conditions.

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Recovery of gold ions from wastewater using a three-compartment electrodialysis separation system

Rezaei

Abdollahi

Ghassa

2023

Int. J. Environ. Sci. Technol.

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Influence of Flow Rate on the Removal of Copper, Lead and Nickel From Solutions in Electrodialysis Process

Abstract: In electrodialysis (ED)

Cited by 3 publications

References 16 publications

Heavy Metal Removal from Aqueous Solutions Using a Customized Bipolar Membrane Electrodialysis Process

Heavy Metal Removal from Aqueous Solutions Using a Customized Bipolar Membrane Electrodialysis Process

Removal of Chromium ions (Cr6+) and Nickel ions (Ni2+) from Simulated Industrial Wastewater Using Flow-by-Porous Electrode

Recovery of gold ions from wastewater using a three-compartment electrodialysis separation system

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