Evaluating the process performance and potential of a high-rate single airlift bioreactor for simultaneous carbon and nitrogen removal through coupling different pathways from a nitrogen-rich wastewater

Mahsa Mirghorayshi, Ali Akbar Zinatizadeh, Mark Van Loosdrecht

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The feasibility of a continuous feed and intermittent discharge airlift bioreactor for simultaneous carbon and nitrogen removal from a low COD/N wastewater was evaluated. The effect of two independent variables, HRT (10–20 h) and NH4 +/(NH4 ++NO3 ) ratio (0.25–0.75), on the bioreactor performance was studied. The relatively high anaerobic to aerobic time ratio made an effective contribution to NH4 +, NO3 , and TN removal. TN removal was enhanced with increase in HRT and decrease in NH4 +/NH4 ++NO3 and at the optimum condition, 616 mg/L (88%) and 213 mg/L (76%) of sCOD and TN were removed, respectively. The results suggested that the nitrogen removal process was based on a combination of anaerobic ammonium oxidation (Anammox), simultaneous nitrification-denitrification (SND), and presumable dissimilatory nitrate reduction to ammonium (DNRA) mechanisms.

Original languageEnglish
Pages (from-to)44-52
Number of pages9
JournalBioresource Technology
Volume260
DOIs
Publication statusPublished - 1 Jul 2018

Keywords

  • Airlift bioreactor
  • Anammox
  • Biological nitrogen removal
  • Low C/N wastewater
  • Single bioreactor

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