Kinetics of denitrification using sulphur compounds: Effects of S/N ratio, endogenous and exogenous compounds

J. L. Campos, S. Carvalho, R. Portela, A. Mosquera-Corral, R. Méndez

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

The influence of different sulphur to nitrogen (S/N) ratios on the specific autotrophic denitrification activity was studied in batch experiments using thiosulphate and nitrate as substrates. Transitory accumulations of nitrite were observed for assays with S/N ratios of 3.70 and 6.67 g/g, probably due to the higher specific reduction rate of nitrate compared to that of nitrite. Nitrite was the main end product when S/N ratios of 1.16 and 2.44 g/g were tested. The effects of endogenous (NO3-, NO2-, S2 O32 - and SO42 -) and exogenous compounds (acetate and NaCl) on the specific denitrifying activity of the sludge were tested. Nitrite and sulphate did exert clear inhibitory effects over the process while thiosulphate, acetate and NaCl did not have strong effects at the concentrations tested. Similar experiments also showed that sulphur was not a suitable electron donor for these microorganisms, but sulphide was used successfully.

Original languageEnglish
Pages (from-to)1293-1299
Number of pages7
JournalBioresource Technology
Volume99
Issue number5
DOIs
StatePublished - Mar 2008
Externally publishedYes

Keywords

  • Autotrophic denitrification
  • Inhibition
  • Kinetics
  • Nitrate
  • Thiosulphate

Fingerprint

Dive into the research topics of 'Kinetics of denitrification using sulphur compounds: Effects of S/N ratio, endogenous and exogenous compounds'. Together they form a unique fingerprint.

Cite this