Effect of KMnO4 on the migration and transformation of Mn2+ and NH4+-N in electrolytic manganese residue: Autocatalytic system of manganese (Mn2+-MnO2-Mn2+)

[Display omitted] •KMnO4 accelerates the migration and transformation of Mn2+ and NH4+-N in EMR.•NH4+-N was trapped in EMR mainly through electrostatic and ion exchange interactions.•Mn2+ was converted primarily for the new ecologically hydrated MnO2 (NEHMO).•This study provides theoretical support...

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Veröffentlicht in:Chemical engineering science Jg. 282; S. 119230
Hauptverfasser: Yang, Huimin, Deng, Yaling, Shu, Jiancheng, Chen, Mengjun, Yang, Yong, Deng, Zongyu
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 05.12.2023
Schlagworte:
Autocatalytic system
EMR
Migration and transformation
Mn2
NH4+-N
Mn2
Migration and transformation
NH4+-N
EMR
Autocatalytic system
ISSN:0009-2509
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Zusammenfassung:[Display omitted] •KMnO4 accelerates the migration and transformation of Mn2+ and NH4+-N in EMR.•NH4+-N was trapped in EMR mainly through electrostatic and ion exchange interactions.•Mn2+ was converted primarily for the new ecologically hydrated MnO2 (NEHMO).•This study provides theoretical support for the harmless treatment of EMR. Electrolytic manganese residue (EMR) leachate contains high concentrations of Mn2+, NH4+-N, and heavy metals, seriously damaging the ecological environment. In this study, the effects of different KMnO4 dosages on the migration and transformation of Mn2+ and NH4+-N in EMR were investigated. The results showed that KMnO4 accelerated the migration and transformation of Mn2+ and NH4+-N. Mn2+ was mainly converted to the new ecologically hydrated MnO2 (NEHMO), which adsorbed Mn2+ and then oxidized it to form new active manganese oxides, thus constructing an autocatalytic oxidation reaction system of manganese (Mn2+-MnO2-Mn2+). A part of NH4+-N adsorbed on the NEHMO surface was catalytically oxidized to NO3–-N and NO2–-N. Mn2+on the EMR surface of the KMnO4 system mainly existed in the form of Mn3+, and the manganese oxides formed by the autocatalytic oxidaton of manganese mainly existed in the EMR system in the Fe-Mn oxidation state and residue state. This study provides theoretical support for developing in-situ remediation technology for EMR in residue sites.
ISSN:0009-2509
DOI:10.1016/j.ces.2023.119230