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The effect of sub-optimal temperature on specific sulfidogenic activity of mesophilic SRB in an H2-fed membrane bioreactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
35114 45076 2010 6 PDF Available
Title
The effect of sub-optimal temperature on specific sulfidogenic activity of mesophilic SRB in an H2-fed membrane bioreactor
Abstract

The sulfidogenic activity of two mesophilic sulfate reducing enrichment cultures was studied in H2-fed membrane bioreactors. The two enrichment cultures had different origins; one of them was a mesophilic and the other a psychrotolerant mesophilic culture. The operational temperatures of the reactors were gradually changed: for one the temperature was increased from 9 to 30 °C and for the other it was decreased from 35 to 9 °C. The specific sulfidogenic activities were 21–31, 52–53 and 57–92 mmol SO42− g VSS−1 d−1 at 9, 15 and 30–35 °C, respectively. The sulfate reduction rate of the SRB stabilized to a lower level after the temperature was decreased. The percent electron flow to sulfate reduction was on average 24–32, 50 and 47–69% at 9, 15 and 30–35 °C, respectively. The capability of mesophilic SRB to oxidize electron donor decreased as the temperature was decreased. The results indicate that starting of the reactor operation at 9 °C resulted in higher sulfidogenic activity at sub-optimal temperatures and selective enrichment of the psychrotolerant species improved. The start-up of the reactor at 35 °C resulted in decreased sulfidogenic activity as the temperature was decreased. This indicates that the operational temperature of bioreactors with mesophilic SRB can be decreased to 15–20 °C and the sulfidogenic activity will decrease by 10–40%. Moreover, an operational temperature of 9 °C seems to be close to the lower limit of active sulfate reduction for the mesophilic enrichment cultures used in this study.

Keywords
Low temperature sulfate reduction; Psychrotolerant SRB; Sub-merged membrane bioreactor; Homoacetogenesis
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The effect of sub-optimal temperature on specific sulfidogenic activity of mesophilic SRB in an H2-fed membrane bioreactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 3, March 2010, Pages 363–368
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