Biological NOx removal by denitrification process in a jet-loop bioreactor: system performance and model development

Durmazpinar S., Ilhan N., Demir G., Insel G., Dizge N., Ergenekon P., ...More

ENVIRONMENTAL TECHNOLOGY, vol.35, no.11, pp.1358-1366, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 11
  • Publication Date: 2014
  • Doi Number: 10.1080/09593330.2013.868529
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1358-1366
  • Keywords: nitric oxide (NOx) removal, jet-loop bioreactor, denitrification, air pollution control technology, BioDeNOx, NITRIC-OXIDE REMOVAL, FLUE-GAS, BIOTRICKLING FILTER, MICROBIAL REDUCTION, NITROGEN-OXIDES, GENERAL-MODEL, ABSORPTION
  • Istanbul Technical University Affiliated: Yes


Nitrogen monoxide (NO) and nitrogen dioxide referred as NOx are one of the most important air pollutants in the atmosphere. Biological NOx removal technologies have been developing to reach a cost-effective control method for upcoming stringent NOx emission standards. The BioDeNOx system was seen as a promising biological NOx control technology which is composed of two reactors, one for absorbing of NO in an aqueous Fe(II)EDTA(2-) solution and the other for subsequent reduction to N-2 gas in a biological reactor by the denitrification process. In this study, instead of two discrete reactors, only one jet-loop bioreactor (JLBR) was utilized as both absorption and denitrification unit and no chelate-forming chemicals were added. In other words, the advantage of better mass transfer conditions of jet bioreactor was used instead of Fe(II)EDTA(2-). The process was named as Jet-BioDeNOx. The JLBR was operated for the removal of NOx from air streams containing 500-3000ppm NOx and the results showed that the removal efficiency was between 81% and 94%. The air to liquid flow ratio (Q(G)/Q(RAS)) varied in the range of 0.07-0.12. Mathematical modelling of the system demonstrated that the removal efficiency strongly depends on this ratio. The high mass transfer conditions prevailed in the reactor provided a competitive advantage on removing NO gas without any requirement of chelating chemicals.