Recoverability of nitrifying bacteria activity under cyclical and continuous high salinity stress in waste water
In order to investigate the effect of high salt stress on the recovery of nitrifying bacteria activity, this study provided a high salt environment with 20 g/L NaCl, and carried out two stresses (cycle stress, continuous stress) for the above-mentioned nitrifying bacteria group for 26 days. The results showed that the ammonia oxidation ability recovered faster than the continuous stress under cyclic stress, and the ammonia nitrogen removal rate at the 7 th day was 8. 07 mg/L·h, which was restored to 59％ without stress. At this time, the removal rate of ammonia nitrogen under continuous stress was only 2. 30 mg/L·h, which was 17％ without stress. The activity of ammonia oxidizing bacteria can be restored under the above high salt stress mode, but the recovery of nitrite oxidizing bacteria is difficult, which leads to the occurrence of severe nitrite accumulation.
high salinity stressnitrificationcyclical stresscontinuous stressrecoverability
NETL
NSTL
万方数据
维普
