What to do if ammonia levels won’t drop?
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What to do if ammonia levels won’t drop? The COD of the raw water is around 8000. The anaerobic retention time is 41 hours, the anoxic retention time is 2.2 hours, and the retention time in the contact oxidation tank is 20 hours. After the anaerobic process, the ammonia nitrogen level is over 200; currently, the ammonia nitrogen level in the effluent from the secondary sedimentation tank is between 70 and 80. How can this be adjusted, or what measures can be taken to reduce the ammonia nitrogen level?
The factors affecting the removal of ammonia nitrogen include water temperature, sludge age, dissolved oxygen, mixing return flow rate, and C/TN. Currently, low water temperatures in winter directly affect the removal efficiency of ammonia nitrogen.
It’s probably because the water temperature is too low
The factors affecting the removal of ammonia nitrogen include water temperature, sludge age, dissolved oxygen, mixing return flow rate, and C/TN. Currently, low water temperatures in winter directly affect the removal efficiency of ammonia nitrogen. Agreed!
If the ammonia nitrogen level was within the acceptable range before but is not now, it might be due to temperature effects; consider whether heating the wastewater or taking some insulation measures could help. Take another look at the carbon-to-nitrogen ratio of the water fed into the contact oxidation process to see if there is enough carbon source.
What was said upstairs makes sense. Check whether there is enough carbon source; here, carbon refers to those sources that are easily absorbed and degraded by organisms. Also, see if the ammonia nitrogen level in the effluent meets the standards, and whether there have been any significant changes in water quality. If not, it should be considered whether the anaerobic retention time is too long, resulting in less carbon source available for subsequent aerobic processes. You can try adding some glucose.
Microbial strains can be added to increase the number of nitrifying bacteria, thereby rapidly reducing ammonia nitrogen levels.
Adding biological carriers enhances microbial efficiency. Increase the treatment capacity of the tank in situ. To ensure stable compliance with emission standards even in winter. Ganchengman is a good biological filler. http://www.gcmcf.com/Uploads/image/20150615/20150615154843_61566.png