When it comes to ammonia nitrogen, it is a nutrient in water bodies. If there is too much of it, it will cause eutrophication of water bodies. It can be said to be an important cause of oxygen-consuming pollution in water bodies and is detrimental to the growth of aquatic organisms. Just like us humans, it is very necessary to supplement nutrition appropriately. However, if one takes too many nutritional supplements, it may cause minor nosebleeds, and in severe cases, it can even endanger life. Therefore, controlling the ammonia nitrogen content in water bodies is an important indicator to ensure the normal growth of aquatic organisms.

In addition, with the continuous increase in the construction and operation scale of sewage treatment plants, reducing the content of ammonia nitrogen in nature has become one of the important tasks. In this article, let’s explore together the analysis of abnormal ammonia nitrogen in the effluent of a certain plant and the corresponding control measures proposed. This is for reference only! Because the water quality conditions vary from region to region, of course, there are also differences in treatment!

If abnormal ammonia nitrogen in the effluent is observed, it is necessary to check for any changes in the system process data. If the factory operates normally, the ammonia nitrogen in the effluent can be maintained within a certain range. However, if there are problems with nitrifying bacteria, the ammonia nitrogen concentration in the effluent will rise rapidly in a short period of time. As a result, the frequency and speed of online water quality monitoring will affect the effluent data, and the feedback results of the data will be delayed. What the staff need to do is to analyze and characterize the process data affected by the short-term change characteristics of nitrification effect, thereby playing a role in judging the degree of health and taking remedial measures in a timely manner.

The rate of oxygen consumption and the speed of chlorine can be judged by the change in oxygen concentration. If the self-assimilation of bacteria is ignored, the nitrification process can be carried out in the following two steps: 1) Ammonia nitrogen will be oxidized into nitrite nitrogen through the action of nitrifying bacteria; 2) Nitrite nitrogen can be oxidized into nitrate nitrogen through the action of nitrifying bacteria.

1.Staff can use the above situation to understand the nitrification state in the reactor. Under the condition that the aeration volume is relatively fixed and the influent load does not change much, they can observe whether nitrification affects the dissolved oxygen concentration in the biochemical tank. If abnormal ammonia nitrogen in the water is found, staff need to take corresponding measures.

2.Changes in pH value and alkalinity consumption in the effluent. During the biological nitrification reaction, a large amount of H+ is produced to eliminate the alkalinity problem in water. In simple terms, it is necessary to determine the nitrification condition of the oxidation ditch by observing the change in pH value of the effluent. An online pH meter can be used for analysis.

There are five specific measures to control the excessive ammonia nitrogen in water bodies:

1.To reduce the ammonia nitrogen load of the influent water, this can lower the influent installation concentration and also decrease the influent water volume.

2.Do a good job in maintaining the necessary alkali volume for nitrification. During the ammonia nitrogen oxidation process, a certain amount of alkalinity is consumed, which leads to a decrease in pH and affects the normal progress of nitrification. Therefore, there must be sufficient alkalinity in the concentrated solution to ensure the smooth progress of nitrification.

3.It is necessary to control the oxygen concentration reasonably. The oxidation of ammonia nitrogen requires the consumption of dissolved oxygen, but the oxygen concentration is not the higher the better. It needs to be analyzed and understood based on different situations.

4.Adding an appropriate amount of nitrification accelerator can enhance the removal efficiency of ammonia nitrogen in sewage treatment.

5.Minor adjustments to some other processes. For instance, issues such as increasing the reflux both inside and outside the oxidation ditch and reducing the discharge volume of the oxidation ditch.

One more point to emphasize at the end is that to know the ammonia nitrogen content in the water body, a Hangzhou Modi NH3N-8000 Ammonia Nitrogen Water Quality Online Monitoring Instrument should be installed at the water outlet to monitor the changes in ammonia nitrogen in the water body in real time