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Bioreactor leaching of uranium from a low grade Indian silicate ore

Paper ID Volume ID Publish Year Pages File Format Full-Text
3428 170 2013 7 PDF Available
Title
Bioreactor leaching of uranium from a low grade Indian silicate ore
Abstract

Bio-leaching studies were carried out in a 2 L bioreactor- BIOSTAT-B® equipped with a PLC based controller at 20–40% (w/v) pulp density using enriched culture of A.ferrooxidans for Turamdih uranium ore (Jharkhand, India). With the enriched culture of A.ferrooxidans adapted on Fe(II) at pH 2.0, 35 °C and 20% (w/v) pulp density, a 98.3% uranium recovery was recorded in 14 days. The leaching of uranium in the bioreactor improved the dissolution rate by reducing the time from 40 days in shake flask as per our earlier studies to 14 days. While investigating the importance of biogenic Fe(III) in the bio-leaching process a maximum recovery of 84.7% U3O8 was observed at pH 2.0 and 20% (w/v) pulp density in 10 h as compared to the uranium leaching of 38.3% in the control experiments. On raising the pulp density to 30%, uranium bio-recovery increased to 87.6% in 10 h at pH 2.0 with <76 μm size material. This showed a distinct advantage because of better mixing of slurry in the bioreactor with auto-controlled conditions that improved the kinetics.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► This study for bioreactor leaching of uranium from silicate ore is the first attempt with such low tenor material. ► With bacterial species, 98.3% uranium is recovered in 14 days against 40 days in shake-flask. ► With bacteria and biogenic Fe(III), 87.6% uranium leaching is observed in 10 h at same conditions. ► Studies prove the worth of bioreactors in better mixing of slurry that improves the kinetics.

Keywords
Low-grade ore; Uranium; Mesophiles; Bioreactors; Fed-batch culture; Mixing; Biogenic Fe(III)
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Bioreactor leaching of uranium from a low grade Indian silicate ore
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 71, 15 February 2013, Pages 111–117
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us