Continuum between sorption and precipitation of Fe(III) on microbial surfaces

Article Abstract:

Iron sorption and subsequent precipitation reactions at bacterial surfaces is investigated. The presence of a variety of bacteria causes a faster solid-phase partitioning of Fe(III) as hydrous ferric oxide (HFO). HFO formation generally occur at lower pH values and in large numbers at any given pH in the bacterial treatments. Fe(III) reactions at bacterial surface is continous between sorption and precipitation and can be quantitatively described using geochemical principles and modeled using surface precipitation theory.

Ferric oxide, Surface chemistry

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Fe(O)-supported autotrophic denitrification

Article Abstract:

Fe(O) proved capable of sustaining autotrophic denitrification which may help treat nitrate-contaminated waters in ex-situ or in-situ reactive filters. Although Fe(O) was able to stoichiometrically reduce nitrate to ammonium, the removal rates are not affected even by combining denitrifiers with more reactive Fe(O) powder. Flow-through columns packed with steel wool and seeded with autotrophic denitrifiers have allowed nitrate removal for over four months.

Chemical and fertilizer mining, not elsewhere classified, Other Chemical and Fertilizer Mineral Mining, Nitrates, Nonmetal mining, Denitrification

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In-situ remediation of Cr(VI)-contaminated groundwater using permeable reactive walls: laboratory studies

Article Abstract:

Results from an on-site remediation of Cr(VI)-contaminated water reveal that permeable reactive redox walls containing Fe0 are useful in the removal of the contaminant from groundwater. Cr(VI) are removed faster with fine-grained Fe0 than with pyrite and coarse-grained Fe0. The mechanism by which Cr(VI) is removed is through the reduction of Cr(VI) to Cr(III) by the fine-grained Fe0.

Chromium Compounds, Chromium, Chromium (Metal)

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