The deammonification process involves two steps. The first step is the partial nitrification of ammonia (NH4-N) by ammonia oxidizing bacteria (AOB) to produce nitrite (NO2-N) and the second step is the anammox process to “anaerobically” oxidize ammonia to nitrogen gas with nitrite as an electron acceptor (Lackner et al., 2014). Free ammonia (FA) plays a significant role in the stable, long-term deammonification system operation. FA can inhibit the activities of nitrifying bacteria at particular nitrite oxidizing bacteria (NOB). Therefore, the determination of suitable concentration of FA may be effective strategy to enrich AOB population in the AS with simultaneous washout of the NOB from the system. According to Anthonisen et al., (1976) the inhibition impact of FA on AOB is 10–150 mg FA•dm-1 while on NOB is 0.1–1.0 mg FA•dm-1 respectively, based on this NOB - washed out could be obtained in a range of 1.0-10 mg.dm-1 of FA concentration. The aim of this study was to examine the impact of high NH4-N concentration and selected intermittent aeration strategy on enhancing the deamonification process. A special attention has been paid to test and to compare the process performance at the different concentration of FA.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2017
