Selective ion adsorption with pilot-scale membrane capacitive deionization (MCDI): arsenic, ammonium, and manganese removal
Article
Article Title | Selective ion adsorption with pilot-scale membrane capacitive deionization (MCDI): arsenic, ammonium, and manganese removal |
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ERA Journal ID | 41476 |
Article Category | Article |
Authors | Kurz, Edgardo E. Canas (Author), Hellriegel, Ulrich (Author), Luong, Vu T. (Author), Bundschuh, Jochen (Author) and Hoinkis, Jan (Author) |
Journal Title | Desalination and Water Treatment |
Journal Citation | 198, pp. 163-169 |
Number of Pages | 7 |
Year | 2020 |
Publisher | Desalination Publications |
Place of Publication | United States |
ISSN | 1944-3986 |
1944-3994 | |
Digital Object Identifier (DOI) | https://doi.org/10.5004/dwt.2020.26036 |
Web Address (URL) | https://www.deswater.com/DWT_abstracts/vol_198/198_2020_163.pdf |
Abstract | A pilot-scale membrane capacitive deionization (MCDI) unit was used for the selective removal of arsenic (up to 300 μg L–1 As(V)), ammonium (25 mg L–1 NH4 + ), and manganese (6 mg L–1 Mn2+) in experiments with brackish water. Tests were carried out using a commercially available MDCI module and different initial salt concentrations (total dissolved solids, TDS = 0–2 g L–1 NaCl) to investigate the removal capacity and behavior of the MCDI unit with different operational parameters such as applied current, voltage, flow rate, and experimental settings such as pH. Selectivity and adsorption behavior is described and a comparison with lab-models is presented to validate the results obtained in real-life scale and application. While the adsorption capacity of the module decreased with higher TDS, specific ion adsorption improved with ionic mobility and greater ion charge. Removal of NH4 + and Mn2+ at given concentrations was significantly higher than for As(V) but rejection of As(V) could be significantly increased (30%–89.5%) by raising the initial pH value above its pKa = 6.94. Depending on selected operational settings and feed water characteristics, the total energy consumption of the MCDI unit (only electrodes) ranged between 0.89 and 2.74 kWh m–3 with an overall optimum <1 kWh m–3. |
Keywords | Electrosorption; Ion mobility; Groundwater remediation |
ANZSRC Field of Research 2020 | 400513. Water resources engineering |
400411. Water treatment processes | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Karlsruhe University of Applied Sciences, Germany |
Vietnamese-German University, Vietnam | |
School of Civil Engineering and Surveying | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q76w5/selective-ion-adsorption-with-pilot-scale-membrane-capacitive-deionization-mcdi-arsenic-ammonium-and-manganese-removal
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