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Applied and Environmental Microbiology, April 1999, p. 1789-1793, Vol. 65, No. 4
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Effects of Nickel and Cobalt on Kinetics of Methanol Conversion by Methanogenic Sludge as Assessed by On-Line CH4 Monitoring

Graciela Gonzalez-Gil,* Robbert Kleerebezem, and Gatze Lettinga

Department of Agricultural, Environmental and Systems Technology, Subdepartment of Environmental Technology, Wageningen Agricultural University, 6700 EV Wageningen, The Netherlands

Received 10 August 1998/Accepted 12 January 1999

When metals were added in a pulse mode to methylotrophic-methanogenic biomass, three methane production rate phases were recognized. Increased concentrations of Ni and Co accelerated the initial exponential and final arithmetic increases in the methane production rate and reduced the temporary decrease in the rate. When Ni and Co were added continuously, the temporary decrease phase was eliminated and the exponential production rate increased. We hypothesize that the temporary decrease in the methane production rate and the final arithmetic increase in the methane production rate were due to micronutrient limitations and that the precipitation-dissolution kinetics of metal sulfides may play a key role in the biovailability of these compounds.

* Corresponding author. Mailing address: Department of Agricultural, Environmental and Systems Technology, Subdepartment of Environmental Technology, Wageningen Agricultural University, Bomenweg 2, P.O. Box 8129, 6700 EV Wageningen, The Netherlands. Phone: 31-317483432. Fax: 31-317482108. E-mail: graciela.gonzalez{at}algemeen.mt.wau.nl.

Applied and Environmental Microbiology, April 1999, p. 1789-1793, Vol. 65, No. 4
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.




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