Deflocculation of activated sludge by the dissimilatory Fe(III)-reducing bacterium Shewanella alga BrY

Article Abstract:

The reduction of Fe(III) by microorganisms results in the deflocculation of the activated sludge. A decrease in the concentrations of Fe(III) in the sludge water increases the turbidity but changes in Fe(II) have no affect on the turbidity. The Fe(III)-reducing bacterium Shewanella alga BrY reduces the bound Fe(III) in sludge flocs during the oxidation of H2. The reduction of Fe(III) increases the sludge turbidity. The bacterium influences the sludge floc structure during anaerobic periods.

Observations, Oxidation-reduction reaction, Oxidation-reduction reactions, Sludge, Flocculation, Flocculation tests

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Role of hydrophobicity in adhesion of the dissimilatory Fe(III)-reducing bacterium Shewanella alga to amorphous Fe(III) oxide

Article Abstract:

A study was conducted on the mechanisms that promote adhesion of dissimilatory Fe(III)-reducing bacterium Shewanella alga to amorphous Fe(III) oxide. Cell adhesion to amorphous Fe(III) oxide was examined in Shewanella alga BrY and Shewanella alga RAD20 adhesion-deficient strain. Results show the complexity of interactions between amorphous Fe(III) oxide and dissimilatory Fe(III)-reducing bacteria as well as the role of hydrophobic interactions in adhesion control.

Bacterial adhesion, Cell adhesion, Ferric oxide

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Morphological and metabolic responses to starvation by the dissimilatory metal-reducing bacterium Shewanella alga BrY

Article Abstract:

Starvation of the dissimilatory metal-reducing bacteria (DMRB), Shewanella alga BrY leads to contamination of the subsurface environments by the DMRB. The starved DMRB cells are restored with the electron acceptors, oxygen, Fe(III), Co(III)-EDTA and natural subsurface materials. This process leads to bioremediation of groundwater contaminants. A decrease is observed in the mean cell volume and the Fe(III) reductase activity due to starvation.

Physiological aspects, Microbial metabolism, Morphology (Biology), Microorganisms, Anaerobic bacteria

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