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 361783
Title Effect of COD/SO42- ratio and sulfide on thermophilic (55°C) sulfate reduction during the acidification of sucrose at pH 6
Author(s) Lopes, S.I.C.; Wang, X.; Capela, M.I.; Lens, P.N.L.
Source Water Research 41 (2007)11. - ISSN 0043-1354 - p. 2379 - 2392.
Department(s) Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) granular sludge reactors - volatile fatty-acid - anaerobic-digestion - reducing bacteria - waste-water - acidogenic phase - degradation - propionate - velocity - hydrogen
Abstract This study investigated the effect of the COD/SO42¿ ratio (4 and 1) and the sulfide concentration on the performance of thermophilic (55 °C) acidifying (pH 6) upflow anaerobic sludge bed reactors fed with sucrose at an organic loading rate of 4.5 g COD lreactor¿1 day¿1. Sulfate reduction efficiencies amounted to 65% and 25¿35% for the COD/SO42¿ ratios of 4 and 1, respectively. Acidification was complete at all the tested conditions and the electron flow was similar at the two COD/SO42¿ ratios applied. The stepwise decrease of the sulfide concentrations in the reactors with a COD/SO42¿ ratio of 1 by N2 stripping caused an immediate stepwise increase in the sulfate reduction efficiencies, indicating a reversible inhibition by sulfide. The degree of reversibility was, however, affected by the growth conditions of the sludge. Acidifying sludge pre-grown at pH 6, at a COD/SO42¿ ratio of 9 and exposed for 150 days to 115 mg l¿1 sulfide, showed a slower recovery from the sulfide inhibition than a freshly harvested sludge from a full scale treatment plant (pH 7 and COD/SO42¿=9.5) exposed for a 70 days to 200 mg l¿1 sulfide. In the latter case, the decrease of the sulfide concentration from 200 to 45 mg l¿1 (35 mg l¿1 undissociated sulfide) by N2 stripping caused an immediate increase of the sulfate reduction efficiency from 35% to 96%.
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