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

Journal article (2018)

Authors

Mahsa Mirghorayshi Razi University
Ali Akbar Zinatizadeh Razi University
Mark C.M. van Loosdrecht BT/Environmental Biotechnology - AS
Mark M.C. van Loosdrecht BT/Environmental Biotechnology - AS
Research Group
BT/Environmental Biotechnology (AS) (TU Delft)
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Published Date

01-07-2018

Language

English

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Faculty

Applied Sciences

Department

BT/Biotechnologie

Research Group

BT/Environmental Biotechnology

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.

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