Simplified removal of Fe(II) and Mn(II) from groundwater via oxidative coprecipitation with portlandite and subsequent neutralization with CO2 bubbling
Abstract
Groundwater enriched with Fe(II) and Mn(II) at concentrations exceeding 0.3 mg/L and 0.1 mg/L, respectively, may pose serious health risks upon consumption and therefore requires treatment. This study developed a simple, rapid, and effective method to remove Fe(II) and Mn(II) from groundwater (with removal efficiencies greater than 99%) by accelerating their precipitation and oxidation (particularly for iron) under alkaline conditions (at pH of approximately 12.2), constrained with calcium hydroxide (Ca(OH)2). Alkaline water is then neutralized by CO2 bubbling for 3–5 min. This method requires short treatment time (shorter than 1 h), a low Ca(OH)2 dosage (0.5–3.0 g/L), and ambient temperature, and can be easily scaled up to treat large volumes of water because only existing conventional technology is needed (e.g., tanks with agitators at atmospheric pressure, pumps, and injectors). In addition, the advantage of this method is that other metallic pollutants can also be removed during the treatment, and the resulting red solid residue, mainly composed of calcite and iron oxyhydroxide (the FeOOH type) nanoparticles, can be reused as pigments, sorbents, or mineral filler powders for industrial applications. This integrated method can be successfully used to remove toxic dissolved ions from water while generating solid residues with industrial uses.
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BibTeX
@article{ousmane2026simplified,
title = {{Simplified removal of Fe(II) and Mn(II) from groundwater via oxidative coprecipitation with portlandite and subsequent neutralization with CO2 bubbling}},
author = {Mamane Imrana Chaibou Ousmane and German Montes-Hernandez and Manzola Abdou Salam and Sarah Bureau},
journal = {Water Science and Engineering},
year = {2026},
month = jul,
doi = {10.1016/j.wse.2026.07.008},
url = {https://hal.science/hal-05767242v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Simplified removal of Fe(II) and Mn(II) from groundwater via oxidative coprecipitation with portlandite and subsequent neutralization with CO2 bubbling
AU - Mamane Imrana Chaibou Ousmane
AU - German Montes-Hernandez
AU - Manzola Abdou Salam
AU - Sarah Bureau
PY - 2026
DA - 2026/07/29
JO - Water Science and Engineering
DO - 10.1016/j.wse.2026.07.008
UR - https://hal.science/hal-05767242v1
AB - Groundwater enriched with Fe(II) and Mn(II) at concentrations exceeding 0.3 mg/L and 0.1 mg/L, respectively, may pose serious health risks upon consumption and therefore requires treatment. This study developed a simple, rapid, and effective method to remove Fe(II) and Mn(II) from groundwater (with removal efficiencies greater than 99%) by accelerating their precipitation and oxidation (particularly for iron) under alkaline conditions (at pH of approximately 12.2), constrained with calcium hydroxide (Ca(OH)2). Alkaline water is then neutralized by CO2 bubbling for 3–5 min. This method requires short treatment time (shorter than 1 h), a low Ca(OH)2 dosage (0.5–3.0 g/L), and ambient temperature, and can be easily scaled up to treat large volumes of water because only existing conventional technology is needed (e.g., tanks with agitators at atmospheric pressure, pumps, and injectors). In addition, the advantage of this method is that other metallic pollutants can also be removed during the treatment, and the resulting red solid residue, mainly composed of calcite and iron oxyhydroxide (the FeOOH type) nanoparticles, can be reused as pigments, sorbents, or mineral filler powders for industrial applications. This integrated method can be successfully used to remove toxic dissolved ions from water while generating solid residues with industrial uses.
ER -