We know that the influence of ammonia nitrogen content in water is mainly reflected in human health, ecological environment and PH value of water. When we carry out water treatment, NH3N-800 ammonia nitrogen online monitor is needed to detect the content of ammonia nitrogen in water, so as to guide the production of drinking water and ensure safe and high-quality water supply. So why is the ammonia nitrogen in the water higher than in the water? This chapter water quality online monitoring instrument manufacturers to understand the problem together with you. It can be said from the following situations:

There May be a Problem With the Detection Data

The detection data is incorrect. For example, when the yellow wastewater causes the display reading deviation of the ammonia nitrogen national standard detection method (Nachrichter’s reagent method), the data recording error during the detection, the sample confusion, the operation method or steps, etc., there may be a phenomenon that the detected ammonia nitrogen in the effluent is higher than the ammonia nitrogen in the water.

For this problem, the water quality online monitoring equipment can be verified with standard solution. If the color of the raw water shows a deviation in the reading, it is recommended to dilute the original water sample at an appropriate ratio or to filter the color of the pigmented water sample appropriately to detect ammonia nitrogen.

Ammoniation is Greater than Nitrification

In general, the total nitrogen in wastewater is mainly ammonia nitrogen, while the main component of total nitrogen in some specific wastewater (such as amino acid wastewater) is organic nitrogen, which is converted into ammonia nitrogen under the action of ammoniating bacteria, resulting in the increase of ammonia nitrogen in the system.

If the ammoniation reaction rate is higher than the nitrification reaction rate, then the ammonia nitrogen produced will be higher than the nitrated ammonia nitrogen, so the total amount of ammonia nitrogen also increases. This is mainly due to the high content of total nitrogen (especially organic nitrogen) in the water, and the insufficient denitrification reaction time. In addition, some sewage plants have doped industrial wastewater that is difficult to treat or cannot be treated by the process, which can seriously lead to the collapse of the nitrification system, and ammonia nitrogen cannot be converted into nitrate nitrogen.

Advanced Oxidation

For wastewater with poor biodegradability, advanced oxidation methods such as Fenton oxidation method, ozone method, electrochemical treatment method are used for treatment. Under the chain breaking of advanced oxidation, nitrogen can be separated to form ammonia nitrogen, resulting in higher ammonia nitrogen in effluent than in water.

Introduction of Foreign Carbon Sources

In the process of wastewater decarbonization, some external nitrogen sources will be added to meet the requirement of carbon nitrogen ratio, such as excessive dosage, calculation error of C/N ratio, wrong selection of carbon nitrogen and phosphorus ratio, etc., resulting in incomplete microbial consumption and increased effluent ammonia nitrogen.

Sludge Disintegration

The degradation ability of biological nitrogen removal after sludge disintegration is greatly reduced due to sludge aging, poisoning and swelling. The removal rate of ammonia nitrogen decreases with the weakening of sludge concentration and biological activity, making it inferior to the original level. The effluent ammonia nitrogen is higher than the inlet ammonia nitrogen.

Physical and Chemical Adsorption is too Saturated

Ammonia nitrogen is released again from over-saturation treatment by adsorption and denitrification with zeolite, which results in higher effluent ammonia nitrogen than inlet ammonia nitrogen in a certain period.

Reduction Reaction

In the AO process, the lack of nitrogen sources required by denitrifying bacteria in pool A causes the denitrifying bacteria to reduce some nitrate nitrogen to form ammonia nitrogen.

Ammonia Nitrogen is Brought Into the Chemical Agents Used

The introduction of flocculants, oxidation-reducing agents and nutrients from unknown sources in wastewater treatment may bring ammonia nitrogen, resulting in higher ammonia nitrogen in effluent than in inlet.