TY - JOUR
T1 - Characterization and comparison of iron oxyhydroxide precipitates from biotic and abiotic groundwater treatments
AU - Arturi, Katarzyna R.
AU - Bender Koch, Christian
AU - Søgaard, Erik G.
PY - 2017
Y1 - 2017
N2 - Removal of iron is an important step in groundwater treatment for drinking water production. It is performed to prevent organoleptic issues and clogging in water supply systems. Iron can be eliminated with a purely physico-chemical (abiotic) method or biotically with the help of iron-oxidizing bacteria (FeOB). Each of the purification methods requires different operating conditions and results in formation of iron oxyhydroxide (FeOOH) precipitates. Knowledge about the differences in composition and properties of the biotic and abiotic precipitates is desirable from a technical, but also scientific point of view. In this study, a broad spectrum of analytical methods was employed to describe in detail the differences between FeOOH produced in a number of Danish waterworks using either the purely physico-chemical or the biological variation of the iron removal method. According to the results from X-ray diffraction (XRD), small angle X-ray spectroscopy, and visible light microscopy, the precipitate formed with the help of FeOB was more microcrystalline and consisted of agglomerated particles. The purely physico-chemical precipitate was more amorphous and, typically, was composed of smaller particles.
AB - Removal of iron is an important step in groundwater treatment for drinking water production. It is performed to prevent organoleptic issues and clogging in water supply systems. Iron can be eliminated with a purely physico-chemical (abiotic) method or biotically with the help of iron-oxidizing bacteria (FeOB). Each of the purification methods requires different operating conditions and results in formation of iron oxyhydroxide (FeOOH) precipitates. Knowledge about the differences in composition and properties of the biotic and abiotic precipitates is desirable from a technical, but also scientific point of view. In this study, a broad spectrum of analytical methods was employed to describe in detail the differences between FeOOH produced in a number of Danish waterworks using either the purely physico-chemical or the biological variation of the iron removal method. According to the results from X-ray diffraction (XRD), small angle X-ray spectroscopy, and visible light microscopy, the precipitate formed with the help of FeOB was more microcrystalline and consisted of agglomerated particles. The purely physico-chemical precipitate was more amorphous and, typically, was composed of smaller particles.
KW - Abiotic iron oxyhydroxides
KW - Biotic iron oxyhydroxides
KW - Groundwater treatment
KW - Iron oxidizing bacteria
KW - Iron removal
U2 - 10.2166/aqua.2017.025
DO - 10.2166/aqua.2017.025
M3 - Journal article
AN - SCOPUS:85016717883
SN - 1606-9935
VL - 66
SP - 96
EP - 104
JO - Aqua
JF - Aqua
IS - 2
ER -