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Elemental sulfur-based autotrophic denitrification and denitritation: microbially catalyzed sulfur hydrolysis and nitrogen conversions

Author:
Kostrytsia, Anastasiia, Papirio, Stefano, Frunzo, Luigi, Mattei, Maria Rosaria, Porca, Estefanía, Collins, Gavin, Lens, Piet N.L., Esposito, Giovanni
Source:
Journal of environmental management 2018 v.211 pp. 313-322
ISSN:
0301-4797
Subject:
Helicobacteraceae, bioassays, biofilm, biomass, catalytic activity, denitrification, denitrifying bacteria, hydrolysis, models, nitrate nitrogen, nitrates, nitrites, nitrogen, nitrogen dioxide, solubilization, sulfur
Abstract:
The hydrolysis of elemental sulfur (S0) coupled to S0-based denitrification and denitritation was investigated in batch bioassays by microbiological and modeling approaches. In the denitrification experiments, the highest obtained NO3−-N removal rate was 20.9 mg/l·d. In the experiments with the biomass enriched on NO2−, a NO2−-N removal rate of 10.7 mg/l·d was achieved even at a NO2−-N concentration as high as 240 mg/l. The Helicobacteraceae family was only observed in the biofilm attached onto the chemically-synthesized S0 particles with a relative abundance up to 37.1%, suggesting it was the hydrolytic biomass capable of S0 solubilization in the novel surface-based model. S0-driven denitrification was modeled as a two-step process in order to explicitly account for the sequential reduction of NO3− to NO2− and then to N2 by denitrifying bacteria.
Agid:
6297670