Seeking help with nitration and denitrification issues
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The project involves wastewater from pig farms; the treatment process uses a two-stage AO1 system. The ammonia nitrogen level is above the acceptable limit. I would like to ask: the generation cycle of nitrifying bacteria is around 5 days, while that of denitrifying bacteria is around 15 days. If we want to cultivate these bacteria, what is the relationship between sludge removal timing and their generation cycles, and how can it be controlled? 2. There are also points to note when cultivating nitrifying and denitrifying bacteria, as the cultivation period is relatively long; it is necessary to determine whether these bacteria have begun to grow or have already developed during this time. 3. Taking the two-stage AO process as an example, what feasible measures can be taken if the ammonia nitrogen level exceeds the limit? Are there any apparent methods to determine whether the ammonia nitrogen level is too high?
1. Generally speaking, the sludge age in the nitrification tank should be maintained at least at 10 days or more to achieve good nitrification results. 2. In terms of sludge cultivation and acclimatization, cultivating nitrifying bacteria is somewhat more difficult. During the early stages of cultivation, the sludge concentration in the nitrification tank must reach a certain level; alkalinity, temperature, and carbon sources are all factors that limit the growth of nitrifying bacteria. Because nitrobacteria are chemolithoautotrophic bacteria. 3. If the ammonia nitrogen level in the A/O process does not meet the standards, it is possible to check whether the alkalinity and DO levels are within the required ranges. In addition, it is also necessary to determine the degree of nitrification; even if all other factors are met, insufficient numbers of nitrifying bacteria can still result in excessive ammonia levels. This is my personal opinion for reference only.
It is still necessary to handle it in accordance with the specific properties of the water; different waters require different methods. With different sludge ages, there are significant differences in return flow rates, carbon sources, etc
Our pig farm has encountered this problem as well – the ammonia nitrogen level in the effluent is too high, and the reason is the difficulty in cultivating nitrate bacteria. Please give me some advice.