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The impact of Co and Ni speciation on methanogenesis in sulfidic media—Biouptake versus metal dissolution

Paper ID Volume ID Publish Year Pages File Format Full-Text
18045 42710 2007 8 PDF Available
Title
The impact of Co and Ni speciation on methanogenesis in sulfidic media—Biouptake versus metal dissolution
Abstract

The speciation of the trace nutrients Co(II) and Ni(II) in sulfide containing media can control the methanogenic activity of Methanosarcina sp., which is of importance for the optimisation of anaerobic treatment of wastewater containing methanol. To obtain more insight in the mechanistic backgrounds, dissolved metal concentrations and methane production rates were measured for a highly enriched culture, obtained from anaerobic sludge, at various total metal and sulfide concentrations. The methanogenic activity increased with increasing total metal and decreased with increasing total sulfide. Dissolution kinetics and the influence of soluble metal sulfide species explain the trends in the concentrations of the dissolved metal species. The results suggest that the stimulation of the methanogenic activity is related to the free metal ion concentration. Flux calculations and measurements of uptake by a pure culture of Methanosarcina barkeri show that limitation by slow dissolution of the solid metal sulfides is unlikely. Growth therefore seems to be primarily controlled by the biouptake characteristics of the microorganism.

Keywords
Cobalt; Nickel; Precipitation; Biouptake; Anaerobic digestion; Methanogenesis
First Page Preview
The impact of Co and Ni speciation on methanogenesis in sulfidic media—Biouptake versus metal dissolution
Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 4, 5 March 2007, Pages 823–830
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering