Journal
BIORESOURCE TECHNOLOGY
Volume 198, Issue -, Pages 478-487Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.08.123
Keywords
Anammox; Deammonification; IFAS; Mainstream; MBBR
Funding
- Swedish Governmental Agency for Innovative Systems (Vinnova)
- Swedish Water Development (SVU)
- Swedish Environmental Research Institute (IVL)
- Royal Institute of Technology (KTH)
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In this study the system based on the combination of biofilm and activated sludge (IFAS - integrated fixed film activated sludge) was tested and compared with a system that relies only on biofilm (MBBR - moving bed biofilm reactor) for nitrogen removal from municipal wastewater by deammonification process. By introduction of suspended biomass into MBBR the nitrogen removal efficiency increased from 36 +/- 3% to 70 +/- 4% with simultaneous 3-fold increase of nitrogen removal rate. Results of batch tests and continuous reactor operation showed that organotrophic nitrate reduction to nitrite, followed by anammox reaction contributed to this high removal efficiency. After sCOD/NH4-N ratio decreased from 1.8 +/- 0.2 to 1.3 +/- 0.1 removal efficiency decreased to 52 +/- 4%, while still maintaining 150% higher removal rate, comparing to MBBR. Activity tests revealed that affinity of NOB to oxygen is higher than affinity of AOB with half-saturation constants of 0.05 and 0.41 mg/L, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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