Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 407438
Title The effect of sub-optimal temperature on specific sulfidogenic activity of mesophilic SRB in an H-2-fed membrane bioreactor
Author(s) Nevatalo, L.M.; Bijmans, M.F.M.; Lens, P.N.L.; Kaksonen, A.H.; Puhakka, J.A.
Source Process Biochemistry 45 (2010)3. - ISSN 1359-5113 - p. 363 - 368.
Department(s) Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) gas-lift reactor - sulfate reduction - waste-water - retention time - carbon source - metal - bacteria - hydrogen - sulfide - growth
Abstract The sulfidogenic activity of two mesophilic sulfate reducing enrichment cultures was studied in H-2-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 degrees C and for the other it was decreased from 35 to 9 degrees 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 degrees 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 degrees 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 degrees C resulted in higher sulfidogenic activity at suboptimal temperatures and selective enrichment of the psychrotolerant species improved. The start-up of the reactor at 35 degrees 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 degrees C and the sulfidogenic activity will decrease by 10-40%. Moreover, an operational temperature of 9 degrees C seems to be close to the lower limit of active sulfate reduction for the mesophilic enrichment cultures used in this study.
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