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  4. Chromium removal in the presence of NOM during Fe(II) reductive precipitation for drinking water treatment
 
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Chromium removal in the presence of NOM during Fe(II) reductive precipitation for drinking water treatment

Citation Link: https://doi.org/10.15480/882.4603
Publikationstyp
Journal Article
Date Issued
2022-09-16
Sprache
English
Author(s)
Langer, Margarethe  
Jamal, Mohammad Umair  
Conklin, Amanda  
Ernst, Mathias  orcid-logo
Institut
Wasserressourcen und Wasserversorgung B-11  
TORE-DOI
10.15480/882.4603
TORE-URI
http://hdl.handle.net/11420/13649
Journal
Water  
Volume
14
Issue
18
Article Number
2903
Citation
Water 14 (18): 2903 (2022)
Publisher DOI
10.3390/w14182903
Scopus ID
2-s2.0-85138683896
Publisher
Multidisciplinary Digital Publishing Institute
Cr(VI) is toxic and carcinogenic, which fuels discussions on reducing existing standards for maximum Cr concentrations in drinking water. Fe(II) reductive precipitation is a common and economical method for achieving very low Cr(tot) concentrations (<5 µg/L). While Cr(VI) is reduced to Cr(III), Fe(II) is oxidized to Fe(III). The resulting Cr(III) and Fe(III) have low solubilities at neutral pH, precipitate as hydroxides, and can be removed by conventional media filtration. The presence of natural organic matter (NOM) in the raw water source can, depending on pH, concentration, type of NOM, and contact time, affect this process in various ways, from promoting Cr(VI) reduction, to re-reducing Fe(III), to forming stable complexes with Cr and Fe, thus, impairing chromium removal. The presented data showed that NOM, whether dominated by terrestrial humic acid, or of aquatic origin, could substantially impair chromium removal at neutral pH conditions. In particular, the ultimate removal of Cr(III) was affected. Soluble complexes and/or colloids of Cr(III), Fe(III) and NOM in the size range of 10 kDa–0.1 µm were formed, that could not be removed by conventional media filtration. Presence of iron sludge (>50 mg/L Fe(III)) mitigated the negative impacts of NOM on Cr(VI) reduction and Cr(III) removal. However, even 100 mg/L Fe(III), the highest applied sludge concentration, did not lead to a decrease in Fe(II) dosing requirements under the given conditions. A molar ratio higher than the given stochiometric ratio of [Fe(II)]:[Cr(VI)] = 3 was necessary for sufficient Cr(VI) removal.
DDC Class
500: Naturwissenschaften
540: Chemie
600: Technik
620: Ingenieurwissenschaften
Funding(s)
Open-Access-Publikationskosten / 2022-2024 / Technische Universität Hamburg (TUHH)  
Entfernung von Cr(VI) aus Grundwasser durch chemische Reduktion, Koagulation und Membranfiltration  
Funding Organisations
Deutsche Forschungsgemeinschaft (DFG)  
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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