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 318059
Title Competition for H2 between sulfate reducers, methanogens and homoacetogens in a gas-lift reactor
Author(s) Weijma, J.; Gubbels, F.; Hulshoff Pol, L.W.; Stams, A.J.M.; Lens, P.N.L.; Lettinga, G.
Source Water Science and Technology 45 (2002). - ISSN 0273-1223 - p. 75 - 80.
Department(s) Sub-department of Environmental Technology
Microbiological Laboratory
Publication type Refereed Article in a scientific journal
Publication year 2002
Keyword(s) slib - rioolslib - waterstof - afvalwaterbehandeling - substraten - kinetica - sulfaten - anaërobe behandeling - sludges - sewage sludge - hydrogen - waste water treatment - substrates - kinetics - sulfates - anaerobic treatment
Categories Waste Water Treatment
Abstract Reported values for growth kinetic parameters show an order in competitivity of heterotrophic sulfate reducing bacteria>methanogens>homoacetogens for the substrate hydrogen. This order suggests that methanogens can succesfully compete with consortia of heterotrophic SRB and homoacetogens when H2/CO2 is present as sole substrate. However, we found in experiments using gas-lift reactors inoculated with anaerobic sludge and fed with H2/CO2 and sulfate, that heterotrophic sulfate reduction rapidly and completely outcompeted methanogenesis, whereas a low amount of acetate was formed. Thus, in disagreement with the above competitivity order, hydrogen is more readily consumed by homoacetogenesis than by methanogenesis, indicating that the competition is not kinetically determined. The superior settling velocity of sulfidogenic-acetogenic sludge compared to that of methanogenic sludge suggests that the former sludge is better retained, which can explain the predominance of sulfate reduction/homoacetogenesis over methanogenesis.
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