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The effect of chemical oxidation on the biological sulfide oxidation by an alkaliphilic sulfoxidizing bacterial consortium

Paper ID Volume ID Publish Year Pages File Format Full-Text
18292 42717 2007 7 PDF Available
Title
The effect of chemical oxidation on the biological sulfide oxidation by an alkaliphilic sulfoxidizing bacterial consortium
Abstract

Higher solubility at alkaline conditions is very significant for an efficient treatment process of gaseous H2S(g) by reducing the gas–liquid transfer limitations. Nevertheless, the alkaline biodegradation process of H2S can be limited when sulfide concentrations are inhibitory. At alkaline conditions (pH > 9), the abiotic chemical sulfide oxidation can attain relatively high rates. A series of abiotic and biotic kinetic experiments of oxygen consumption were performed at pH 10. For the biological oxidation, an alkaliphilic sulfide oxidizing consortium (ASBC) isolated from a soda lake was used. The intermediates from the chemical sulfide oxidation in alkaline and aerobic conditions did not inhibit the activity of ASBC at six-fold concentration of that where H2S inhibition was detected (1.19 mM). Stoichiometries and kinetic expressions for the chemical sulfide oxidation to pentasulfide (S52−) and its further oxidation to thiosulfate (S2O32−) are proposed and validated with experimental data. The faster oxic chemical sulfide oxidation under alkaline conditions could be advantageous for the biological oxidation to sulfate by reducing the concentration of the inhibiting sulfide. These results suggest that the chemical and the biological oxidation processes can be segregated, allowing higher sulfide loading rates.

Keywords
Sulfide oxidation; Alkaliphilic sulfide oxidizing bacteria; Extremophiles; Sulfide predominance zone diagram
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The effect of chemical oxidation on the biological sulfide oxidation by an alkaliphilic sulfoxidizing bacterial consortium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 2, 4 January 2007, Pages 292–298
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