How to deal with high ammonia nitrogen content in sewage

In recent years, with the development of the economy, more and more nitrogen-containing pollutants have been released randomly, which has caused great harm to the environment. Exceeding the standard of ammonia nitrogen will cause the concentration of dissolved oxygen in the water to decrease, resulting in black and smelly water, eutrophication of the water, and a decline in water quality, which will affect the survival of aquatic animals and plants. However, if we want to deal with the problem of excessive ammonia nitrogen in sewage, we must first understand the causes of excessive ammonia nitrogen and prescribe the right medicine. The causes of excessive ammonia nitrogen are mainly the excessive ammonia nitrogen caused by organic matter, the excessive ammonia nitrogen caused by internal reflux, the excessive ammonia nitrogen caused by too low pH, the excessive ammonia nitrogen caused by too low DO, the excessive ammonia nitrogen caused by sludge age, and the excessive ammonia nitrogen caused by ammonia nitrogen impact. When dealing with it, it is necessary to find out the right reasons, and then formulate corresponding countermeasures. The detection methods of ammonia nitrogen in sewage mainly include the following: 1. Potassium persulfate oxidation ultraviolet-visible spectrometry working principle: the water sample is sent to the ammonia nitrogen digestion tank after the pretreatment device, and then potassium dichromate is added, and the silver salt and In the presence of mercury salts, high-temperature and high-pressure reactions are carried out, and then the concentration of ammonia nitrogen in the water is measured colorimetrically; at the same time, water samples are taken into the colorimetric cell, and Nessler's reagent or salicylic acid is added for colorimetric determination of ammonia nitrogen. The color change of the solution within the measurement range is directly proportional to the concentration of ammonia nitrogen in the water sample, and the content of ammonia nitrogen in the water sample can be calculated by measuring the absorbance of the solution. 2. The working principle of the Nessler reagent method: After the sample is filtered by the online pretreatment device, it is sent into the reaction pool. In the reaction pool, the analyzer first measures and stores the blank value of the sample, and then the instrument automatically adds various reagents including nanometers in sequence. After the reagent is added and the reagent is fully mixed, the instrument will perform a color reaction according to the reaction time set by the user to change the color of the indicator. Within the measurement range, the degree of color change is proportional to the concentration of ammonia nitrogen in the water sample. By measuring the degree of color change, the content of ammonia nitrogen in the water sample can be calculated. 3. The working principle of the expulsion colorimetric method: in the expulsion bottle, the pretreated sample is first mixed with the expulsion liquid, and the expulsion liquid first converts the ammonia nitrogen in the sample into ammonia gas, and then under the action of the diaphragm pump , Ammonia gas is sent to the colorimetric cell to react with the indicator in the colorimetric cell to change the color of the indicator. Within the measurement range, the degree of color change is proportional to the concentration of ammonia nitrogen in the water sample. By measuring the degree of color change, the content of ammonia nitrogen in the water sample can be calculated. 4. After the sample of salicylic acid colorimetry is filtered by the online pretreatment device, it is sent into the reaction pool. In the reaction pool, the analyzer first measures and stores the blank value of the sample, and then the instrument automatically adds masking agent and salicylic acid in sequence. For reagents such as chromogenic reagent and environmental control solution, after the reagents are added and fully mixed, the instrument will perform a color reaction according to the reaction time set by the user to change the color of the indicator. Within the measurement range, the degree of color change is proportional to the concentration of ammonia nitrogen in the water sample. By measuring the degree of color change, the content of ammonia nitrogen in the water sample can be calculated.