Nitrogen removal and intentional nitrous oxide production from reject water in a coupled nitritation/nitrous denitritation system under real feed-stream conditions

Max Weißbach, Paul Thiel, Jörg E. Drewes, Konrad Koch

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

A Coupled Aerobic-anoxic Nitrous Decomposition Operation (CANDO) was performed over five months to investigate the performance and dynamics of nitrogen elimination and nitrous oxide production from digester reject water under real feed-stream conditions. A 93% conversion of ammonium to nitrite could be maintained for adapted seed sludge in the first stage (nitritation). The second stage (nitrous denitritation), inoculated with conventional activated sludge, achieved a conversion of 70% of nitrite to nitrous oxide after only 12 cycles of operation. The development of an alternative feeding strategy and the addition of a coagulant (FeCl3) facilitated stable operation and process intensification. Under steady-state conditions, nitrite was reliably eliminated and different nitrous oxide harvesting strategies were assessed. Applying continuous removal increased N2O yields by 16% compared to the application of a dedicated stripping phase. These results demonstrate the feasible application of the CANDO process for nitrogen removal and energy recovery from ammonia rich wastewater.

Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalBioresource Technology
Volume255
DOIs
StatePublished - May 2018

Keywords

  • Coupled Aerobic-anoxic Nitrous Decomposition Operation
  • Digester reject water
  • Energy recovery
  • Nitrogen removal
  • Nitrous oxide

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