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BIOFILTRATION FIELD STUDY FOR COLD FE(II)- AND MN(II)-RICH GROUNDWATER: ACCELERATED MN(II) REMOVAL KINETICS AND COLD-ADAPTED MN(II)-OXIDIZING MICROBIAL POPULATIONS
Dangeti, S., B. Roshani, B. Rindall, J.M. McBeth, and W. Chang.
Water Quality Research Journal 53(1):10.2166/wqrj.2017.006(2017)

A 2-stage pilot-scale biofilter developed to remove Fe and Mn at on-site temperatures ranging from 8-14.8°C achieved acceleration of Mn(II) removal following acclimation despite generally slow Mn(II) removal kinetics at <15°C. Mn(II) removal began at 8°C in the Mn filter after Fe(II) removal. A shift in redox-pH conditions favored biological Mn(II) removal, and Mn(II)-oxidizing bacteria increased. After 97 days the Mn filter reached steady-state functioning at high removal efficiencies (97 ± 0.9%). Although first-order rate constants for Mn(II) removal were low at that point, first-order rate constants accelerated to 0.21/min after consecutive backwashes and filter inoculation with backwashed sludge. The cold-adapted microbial consortium (51 genera including Pseudomonas, Leptothrix, Flavobacterium, and Zoogloea cultured from the field-aged biofilter) rapidly produced biogenic Mn oxides at 8°C, confirmed by electron paramagnetic resonance spectroscopy.



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