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 350408
Title Effect of biologically produced sulfur on gas absorption in a biotechnological hydrogen sulfide removal process
Author(s) Kleinjan, W.E.; Lammers, J.N.J.J.; Keizer, A. de; Janssen, A.J.H.
Source Biotechnology and Bioengineering 94 (2006)4. - ISSN 0006-3592 - p. 633 - 644.
Department(s) Sub-department of Environmental Technology
Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) dissolved sodium sulfide - aqueous-solutions - slurry reactors - mass-transfer - particles - iodine - co2
Abstract Absorption of hydrogen sulfide in aqueous suspensions of biologically produced sulfur particles was studied in a batch stirred cell reactor, and in a continuous set-up, consisting of a lab-scale gas absorber column and a bioreactor. Presence of biosulfur particles was found to enhance the absorption rate of H2S gas in the mildly alkaline liquid. The mechanism for this enhancement was however found to depend on the type of particles used. In the gently stirred cell reactor only small hydrophilic particles were present (dp <3 ¿m) and the enhancement of the H2S absorption rate can be explained from the heterogeneous reaction between dissolved H2S and solid elemental sulfur to polysulfide ions, S x2-. Conditions favoring enhanced H2S absorption for these hydrophilic particles are: low liquid side mass transfer (KL), high sulfur content, and presence of polysulfide ions. In the set-up of gas absorber column and bioreactor, both small hydrophilic particles and larger, more hydrophobic particles were continuously produced (dp up to 20 ¿m). Here, observed enhancement could not be explained by the heterogeneous reaction between sulfide and sulfur, due to the relatively low specific particle surface area, high kL, and low [Sx2-]. A more likely explanation for enhancement here is the more hydrophobic behavior of the larger particles. A local increase of the hydrophobic sulfur particle concentration near the gas/liquid interface and specific adsorption of H2S at the particle surface can result in an increase in the H2S absorption rate
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