Dissolved oxygen (DO) is a necessary and important influencing factor for the removal of manganese in water treatment. However, lately, it was found that an iron-manganese (Fe-Mn) co-oxide filter film could continuously catalyze oxidation to remove high concentrations of manganese from groundwater under low or even no DO condition, which has been developed for manganese and ammonium removal from groundwater by catalytic oxidation. In this work, a pilot-scale filter treating real groundwater was adapted to explore the performance of manganese removal by the Fe-Mn co-oxide under three different DO conditions. Results indicated that the Fe-Mn co-oxide filter exhibited excellent manganese removal performance without consumption of DO under anaerobic condition, which may attribute to high pH. The morphology, composition, structure and manganese valence changes of the Fe-Mn co-oxide filter film have been studied in detail using scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Brunauer Emmett Teller (BET) and X-ray photoelectron spectroscopy (XPS) techniques. Mechanistic studies for the catalytic reaction have been conducted and related to the characterization results. The Fe-Mn co-oxide filter film under anaerobic condition has shown to be highly contact surface area and pore volume, possessing more adsorption sites and reaction channel for manganese removal. Combined the analysis of manganese species and relationship between manganese removal and DO consumption, it could be concluded that Mn(II) in solution should be mostly converted to solid phase Mn(II) of the Fe-Mn co-oxide under anaerobic conditions, since no DO consumption and high surface Mn(II) content. Finally, the mechanism of manganese removal under anaerobic conditions was proposed. This discovery reveals a new approach for manganese removal in groundwater treatment.

Manganese removal by iron–manganese co-oxide filter films under anaerobic condition in groundwater treatment

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.