Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization
Flow-electrode Capacitive Deionization (FCDI) is an innovative method for practical salt removal and recycling applications. Here, we report that FCDI facilitates the recovery of nitrate and fluoride salts from brines produced during the wastewater treatment process in a stainless steel pickling lin...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-11-01
|
| Series: | Journal of Hazardous Materials Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666911025000085 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850235875198238720 |
|---|---|
| author | Niklas Köller Dustin Roedder Christian J. Linnartz Mark Enders Florian Morell Patrick Altmeier Matthias Wessling |
| author_facet | Niklas Köller Dustin Roedder Christian J. Linnartz Mark Enders Florian Morell Patrick Altmeier Matthias Wessling |
| author_sort | Niklas Köller |
| collection | DOAJ |
| description | Flow-electrode Capacitive Deionization (FCDI) is an innovative method for practical salt removal and recycling applications. Here, we report that FCDI facilitates the recovery of nitrate and fluoride salts from brines produced during the wastewater treatment process in a stainless steel pickling line. Laboratory-scale experiments with synthetic wastewaters were used to evaluate the influence of (a) the membrane thickness, (b) feed flow rates, and (c) applied voltage on the outlet concentrations and the average salt transfer rate. In continuous single-pass experiments, the flow rates of diluate and concentrate have the greatest influence on the resulting outlet concentrations in the FCDI process as they directly influence the residence time. The operating voltage of the FCDI process can be varied to increase the ratio of fluoride over nitrate for recycling. |
| format | Article |
| id | doaj-art-c25ab4e9683342b19b68073e76c79a37 |
| institution | OA Journals |
| issn | 2666-9110 |
| language | English |
| publishDate | 2025-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hazardous Materials Letters |
| spelling | doaj-art-c25ab4e9683342b19b68073e76c79a372025-08-20T02:02:07ZengElsevierJournal of Hazardous Materials Letters2666-91102025-11-01610014810.1016/j.hazl.2025.100148Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionizationNiklas Köller0Dustin Roedder1Christian J. Linnartz2Mark Enders3Florian Morell4Patrick Altmeier5Matthias Wessling6RWTH Aachen University, Aachener Verfahrenstechnik-Chemical Process Engineering, Forckenbeckstraße 51, Aachen 52074, GermanyRWTH Aachen University, Aachener Verfahrenstechnik-Chemical Process Engineering, Forckenbeckstraße 51, Aachen 52074, GermanyRWTH Aachen University, Aachener Verfahrenstechnik-Chemical Process Engineering, Forckenbeckstraße 51, Aachen 52074, Germany; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52074, GermanySIMA-tec GmbH, Schier 12c, Schwalmtal 41366, GermanyOutokumpu Nirosta GmbH, Oberschlesienstraße 16, Krefeld 47807, GermanyPCCell GmbH, Lebacher Straße 60, Heusweiler 66265, GermanyRWTH Aachen University, Aachener Verfahrenstechnik-Chemical Process Engineering, Forckenbeckstraße 51, Aachen 52074, Germany; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52074, Germany; Corresponding author at: RWTH Aachen University, Aachener Verfahrenstechnik-Chemical Process Engineering, Forckenbeckstraße 51, Aachen 52074, Germany.Flow-electrode Capacitive Deionization (FCDI) is an innovative method for practical salt removal and recycling applications. Here, we report that FCDI facilitates the recovery of nitrate and fluoride salts from brines produced during the wastewater treatment process in a stainless steel pickling line. Laboratory-scale experiments with synthetic wastewaters were used to evaluate the influence of (a) the membrane thickness, (b) feed flow rates, and (c) applied voltage on the outlet concentrations and the average salt transfer rate. In continuous single-pass experiments, the flow rates of diluate and concentrate have the greatest influence on the resulting outlet concentrations in the FCDI process as they directly influence the residence time. The operating voltage of the FCDI process can be varied to increase the ratio of fluoride over nitrate for recycling.http://www.sciencedirect.com/science/article/pii/S2666911025000085Flow-electrode capacitive deionizationStainless steel picklingSalt brinesNitrateFluoride |
| spellingShingle | Niklas Köller Dustin Roedder Christian J. Linnartz Mark Enders Florian Morell Patrick Altmeier Matthias Wessling Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization Journal of Hazardous Materials Letters Flow-electrode capacitive deionization Stainless steel pickling Salt brines Nitrate Fluoride |
| title | Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization |
| title_full | Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization |
| title_fullStr | Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization |
| title_full_unstemmed | Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization |
| title_short | Recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow-electrode capacitive deionization |
| title_sort | recovery of nitrate and fluoride salts from stainless steel pickling wastewater with flow electrode capacitive deionization |
| topic | Flow-electrode capacitive deionization Stainless steel pickling Salt brines Nitrate Fluoride |
| url | http://www.sciencedirect.com/science/article/pii/S2666911025000085 |
| work_keys_str_mv | AT niklaskoller recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT dustinroedder recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT christianjlinnartz recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT markenders recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT florianmorell recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT patrickaltmeier recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization AT matthiaswessling recoveryofnitrateandfluoridesaltsfromstainlesssteelpicklingwastewaterwithflowelectrodecapacitivedeionization |