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Incorporating aluminum species in MnO x (s) coatings on water filtration media
Author(s) -
Jones Andrew,
Murayama Mitsu,
Knocke William R.
Publication year - 2018
Publication title -
awwa water science
Language(s) - English
Resource type - Journals
ISSN - 2577-8161
DOI - 10.1002/aws2.1114
Subject(s) - manganese , filtration (mathematics) , aluminium , materials science , coating , amorphous solid , chlorine , chemical engineering , scanning electron microscope , metallurgy , inorganic chemistry , chemistry , composite material , statistics , mathematics , organic chemistry , engineering
The manganese oxide (MnO x (s)) coatings often found on water treatment filtration media are known to effectively remove dissolved manganese from water, but little is known about the chemistry and the formation of these MnO x (s) coatings. This study evaluated the role of particulate aluminum (Al) species (specifically Al(OH) 3 (am)) as a source for aluminum found in these media coatings. Bench‐scale experiments and surface analysis techniques evaluated the aluminum and manganese content of the media coatings formed under varying conditions. Particulate aluminum species were shown to be a significant source of aluminum in the MnO x (s)‐based coatings on filter media. Likewise, aluminum incorporation into the media coating did not take place without soluble manganese and free chlorine concurrently being applied to the filter media. Analysis of the MnO x (s) coating by electron microscopy showed a heterogeneous surface composed of a mix of weakly crystalline manganese oxides existing alongside amorphous Al(OH) 3 (am) species.