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 350551
Title Effect of sulfur compounds on biological reduction of nitric oxide in aqueous Fe(II)EDTA2- solutions
Author(s) Manconi, I.; Maas, P.M.F. van der; Lens, P.N.L.
Source Nitric oxide : biology and chemistry 15 (2006)1. - ISSN 1089-8603 - p. 40 - 49.
Department(s) Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) denitrifying pseudomonas-fluorescens - nitrous-oxide - waste-water - flue-gases - sulfide - denitrification - removal - inhibition - respiration - bioreactors
Abstract Biological reduction of nitric oxide (NO) in aqueous solutions of EDTA chelated Fe(II) is one of the main steps in the BioDeNOx process, a novel bioprocess for the removal of nitrogen oxides (NOx) from polluted gas streams. Since NOx contaminated gases usually also contain sulfurous pollutants, the possible interferences of these sulfur compounds with the BioDeNOx process need to be identified. Therefore, the effect of the sulfur compounds Na2SO4, Na2SO3, and H2S on the biological NO reduction in aqueous solutions of Fe(II)EDTA2¿ (25 mM, pH 7.2, 55 °C) was studied in batch experiments. Sulfate and sulfite were found to not affect the reduction rate of Fe(II)EDTA2¿ complexed NO under the conditions tested. Sulfide, either dosed externally or formed during the batch incubation out of endogenous sulfur sources or the supplied sulfate or sulfite, influences the production and consumption of the intermediate nitrous oxide (N2O) during Fe(II)EDTA2¿ bound NO reduction. At low concentrations (0.2 g VSS/l) of denitrifying sludge, 0.2 mM free sulfide completely inhibited the nitrosyl-complex reduction. At higher biomass concentrations (1.3¿2.3 g VSS/l), sulfide (from 15 ¿M to 0.8 mM) induced an incomplete NO denitrification with N2O accumulation. The reduction rates of NO to N2O were enhanced by anaerobic sludge, presumably because it kept FeEDTA in the reduced state
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