Abstract
This study explored the adaptive response of microbial community structure of anammox granular sludge (AnGS) and the recovery effect of biomass addition strategy under dual inhibitions of high salinity and low temperature. The results showed that, anammox process stable operated in a high-salt environment (18 g-NaCl L-1) at 35 °C, and the nitrogen removal rate (NRR) reached 0.60 kg-N m-3 d-1. The high salinity tolerance and recovery performance were attributed to the dominant functional bacteria genus Unclassified Candidatus Brocadiaceae selected by salinity. When the temperature dropped to 17 ℃, nitrogen accumulation (especially nitrite) could not be alleviated by simply reducing the substrate concentration. After adding 6 mL L-1 of sludge per day with an activity of 0.09 kg-N kg-VSS-1 d-1, nitrogen removal performance quickly recovered to 0.42 kg-N m-3 d-1 and reached 0.54 kg-N m-3 d-1 as the temperature recovered to 32 ℃. The abundance of 7.75E+10 copies g-SS-1 may be the primary value required by anammox bacteria in the adverse environment of high-salty and low-temperature.
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