As we know, EPS can help the adhension of Fe3+ to minerals. Is it possible for EPS to promote the ferrous oxidation mediated by Acidithiobacillus ferrooxidans. Are there any reports about that? Looking forward to your kind reply ASAP. Thanks a lot.
Dear Jihan,
It seems that EPS promotes the ferrous oxidation mediated by Acidithiobacillus ferrooxidans (see the following abstract from a paper entitled " Influences of Extracellular Polymeric Substances on the Dewaterability of Sewage Sludge during Bioleaching" in PLOS ONE Published: July 22, 2014DOI: 10.1371/journal.pone.0102688.
Abstract
Extracellular polymeric substances (EPS) play important roles in regulating the dewaterability of sludge. This study sought to elucidate the influence of EPS on the dewaterability of sludge during bioleaching process. Results showed that, in bioleaching system with the co-inoculation of Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5 (A. t+A. f system), the capillary suction time (CST) of sludge reduced from 255.9 s to 25.45 s within 48 h, which was obviously better than the controls. The correlation analysis between sludge CST and sludge EPS revealed that the sludge EPS significantly impacted the dewaterability of sludge. Sludge CST had correlation with protein content in slime and both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers, and the decrease of protein content in slime and decreases of both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers improved sludge dewaterability during sludge bioleaching process. Moreover, the low sludge pH (2.92) and the increasing distribution of Fe in the solid phase were another two factors responsible for the improvement of sludge dewaterability during bioleaching. This study suggested that during sludge bioleaching the growth of Acidithiobacillus species resulted in the decrease of sludge pH, the increasing distribution of Fe in the solid phase, and the decrease of EPS content (mainly including protein and/or polysaccharide) in the slime, TB-EPS, and Slime+LB+TB layers, all of which are helpful for sludge dewaterability enhancement.
Hoping this will be helpful,
Rafik
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