On the battlefield of water resource protection, the ammonia-nitrogen treatment tower stands like a valiant guardian, silently safeguarding the cleanliness and health of water bodies.

　　Ammonia nitrogen, a common pollutant in water bodies, primarily originates from domestic sewage, industrial wastewater, and agricultural non-point source pollution. Excessively high levels of ammonia nitrogen can lead to eutrophication of water bodies, triggering massive algal blooms, disrupting the ecological balance of aquatic ecosystems, and posing toxic threats to aquatic organisms. Moreover, it can compromise the safety of drinking water sources. The ammonia nitrogen treatment tower was developed precisely to address this serious water pollution issue.

　　The working principle of the ammonia-nitrogen treatment tower is based on the integrated application of various physical, chemical, and biological methods. Among these, the primary physical method is air stripping. In the ammonia-nitrogen treatment tower, air is bubbled into the water body. Leveraging the fact that the solubility of ammonia in water varies with pH and temperature, the ammonia nitrogen in the water is transferred from the liquid phase into the gas phase, escaping into the air. This process is akin to a clever “gas-displacement magic trick”: under specific temperature and pH conditions, the ammonia nitrogen seems magically transformed from a liquid state into a gaseous state, thereby escaping from the water body.

　　Chemical methods are also an important approach for treating ammonia-nitrogen-containing wastewater. For example, the breakpoint chlorination method involves adding an appropriate amount of chlorine to water containing ammonia nitrogen in a treatment tower. When the molar ratio of chlorine to ammonia nitrogen reaches a certain value—known as the breakpoint—the ammonia nitrogen is oxidized into nitrogen gas and removed from the water. This method is akin to a precise stoichiometric game: each chlorine molecule acts like a highly accurate “cleaning agent,” reacting with ammonia-nitrogen molecules according to established rules and converting them into harmless nitrogen gas.

　　The biological method is equally indispensable in ammonia-nitrogen treatment towers. Biological nitrogen removal relies primarily on the action of nitrifying and denitrifying bacteria. By creating an environment within the treatment tower that is conducive to bacterial growth, wastewater containing ammonia nitrogen first undergoes nitrification by nitrifying bacteria, which convert ammonia nitrogen into nitrite and nitrate. Subsequently, denitrifying bacteria carry out denitrification, transforming nitrite and nitrate back into nitrogen gas that is released into the atmosphere. The biological treatment of ammonia nitrogen exemplifies nature’s remarkable power—these tiny bacteria act like a diligent team of “sanitizers,” systematically breaking down and converting ammonia-nitrogen pollutants.

　　The structural design of the ammonia-nitrogen treatment tower is ingeniously crafted. It typically comprises several key components: the tower body itself, the inflow system, the water-distribution device, the packing layer, the aeration system, and the effluent system. The inflow system is responsible for steadily delivering wastewater containing ammonia nitrogen into the treatment tower. The water-distribution device evenly spreads the incoming wastewater over the packing layer, ensuring that every part of the wastewater receives effective treatment. The packing layer provides a suitable substrate for microbial attachment and growth, significantly increasing the contact area between microorganisms and wastewater—much like a series of miniature “biological apartments” that allow microbes to thrive and carry out ammonia-nitrogen removal efficiently. The aeration system supplies the necessary gases required for both the stripping and biological treatment processes, while the effluent system is tasked with discharging the treated water that meets the prescribed standards from the tower.

　　Ammonia-nitrogen treatment towers play an irreplaceable role in numerous fields. In municipal wastewater treatment plants, ammonia-nitrogen treatment towers are among the core treatment equipment, ensuring that treated wastewater meets discharge standards and can be safely released into natural water bodies without causing pollution. In industrial sectors such as chemical engineering, pharmaceuticals, and food processing, ammonia-nitrogen treatment towers effectively remove ammonia nitrogen from wastewater, reducing enterprises' environmental pollution burden, helping them comply with environmental protection requirements, and enabling sustainable development.

　　As technology continues to advance, ammonia-nitrogen treatment towers will keep undergoing continuous improvement and innovation. New types of packing materials, more efficient aeration technologies, and intelligent operation management systems will keep emerging, enabling ammonia-nitrogen treatment towers to play an even greater role in purifying water bodies and protecting water resources.