Abstract
Nitritation (ammonium to nitrite) as a pre-treatment of Anammox (anaerobic ammonium oxidation) is a key step for an energy-efficient nitrogen-removal alternative from dilute wastewaters, e.g. anaerobically-treated sewage, with which limited study has achieved sustainable nitritation at ambient temperature and short hydraulic retention times. To this end, pH-gradient real-time aeration control in an oxygen-based membrane biofilm reactor was observed at 20°C in the sequencing batch mode. An optimum oxygen supply via diffusion for ammonium-oxidizing bacteria (AOB) was established, but nitrite-oxidizing bacteria (NOB) could be inhibited. The system achieved nitrite accumulation efficiencies varying from 88% to 94% with the aeration control. Mass balance and rate performance analyses indicate that this aeration control is able to supply an oxygen rate of 1.5mol O2mol-1ammonium fed, the benchmark oxygenation rate based on stoichiometry for nitritation community selection. Microbial analyses confirmed AOB prevalence with NOB inhibition under this aeration control.
Original language | English |
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Pages (from-to) | 2320-2325 |
Number of pages | 6 |
Journal | Chemosphere |
Volume | 90 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Feb 2013 |
Keywords
- Anammox
- Membrane biofilm reactor (MBfR)
- Nitritation
- Non-porous hollow fiber membrane
- Real-time aeration control
ASJC Scopus subject areas
- Environmental Chemistry
- Chemistry(all)