Nitric oxide and nitrite removal by partial denitrifying hollow-fiber membrane biofilm reactor coupled with nitrous oxide generation as energy recovery

Yu K. H., Can F., Ergenekon P.

Environmental Technology (United Kingdom), vol.43, no.19, pp.2934-2947, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 19
  • Publication Date: 2022
  • Doi Number: 10.1080/09593330.2021.1910348
  • Journal Name: Environmental Technology (United Kingdom)
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, Compendex, EMBASE, Environment Index, Geobase, Greenfile, INSPEC, MEDLINE, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.2934-2947
  • Keywords: Hollow-fibre membrane biofilm reactor, NO removal, N2O production, partial denitrification, energy recovery, DENITRIFICATION
  • Kocaeli University Affiliated: No


© 2021 Informa UK Limited, trading as Taylor & Francis Group.Nitrogen oxide (NOx) emissions cause significant impacts on the environment and must therefore be controlled even more stringently. This requires the development of cost-effective removal strategies which simultaneously create value-added by-products or energy from the waste. This study aims to treat gaseous nitric oxide (NO) by hollow-fibre membrane biofilm reactor (HFMBfR) in the presence of nitrite ((Formula presented.)) and evaluate nitrous oxide (N2O) emissions formed as an intermediate product during the denitrification process. Accumulated N2O can be utilised in methane oxidation as an oxidant to produce energy. In the first stage of the study, the HFMBfR was operated by feeding only gaseous NO as the nitrogen source. During this period, the best performance was achieved with 92% NO removal efficiency (RE). In the second stage, both NO gas and (Formula presented.) were supplied to the system, and 91% NO and 99% (Formula presented.) reduction were achieved simultaneously with the maximum N2O generation of 386 ± 31 ppm. Lower influent carbon to nitrogen (C/N) ratios, such as 4.5 and 2.0, and higher (Formula presented.) −N loading rate of 158 mg N day−1 favoured N2O generation. An improved NO removal rate and N2O accumulation were seen with the increasing amount of (Formula presented.) in the medium. The 16S rDNA sequencing analysis revealed that Alicycliphilus denitrificans and Pseudomonas putida were the dominant species. The study shows that an HFMBfR can be successfully used to eliminate both (Formula presented.) and gaseous NO and simultaneously generate N2O by adjusting the system parameters such as C/N ratio, (Formula presented.) and (Formula presented.) loading.