Journal
CHEMOSPHERE
Volume 88, Issue 6, Pages 712-717Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.04.026
Keywords
Biotrickling filter; Hydrogen sulphide; Biomass characterisation; Sulphide oxidising bacteria; Biological sulphide oxidation
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A pilot scale test on a biotrickling filter packed with polyurethane foam cubes was carried out for 110 d at high volumetric mass load (up to 280 g m(bed)(-3) h(-1)) with the aim of studying the accumulation of solids in the treatment of H2S. Removal rate up to 245 g m(bed)(-3) h(-1) was obtained; however, an accumulation of gypsum, elemental sulphur and, above all, inert biomass was identified as the cause of an increased pressure drop over the long term. A mathematical model was applied and calibrated with the experimental results to describe the accumulation of biomass. The model was capable of describing the accumulation of solids and, corresponding to a solids retention time of 50 d. the observed yield resulted in 0.07 g of solids produced g(-1) H2S removed. Respirometric tests showed that heterotrophic activity is inhibited at low pH (pH < 2.3), and the contribution to biomass removal through decay was negligible. (C) 2012 Elsevier Ltd. All rights reserved.
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