The general formation of ammonia-nitrogen wastewater is due to the coexistence of ammonia water and inorganic ammonia. The composition of ammonia-nitrogen in wastewater mainly includes two types: one is ammonia-nitrogen formed by ammonia water, and the other is ammonia-nitrogen formed by inorganic ammonia, primarily including ammonium sulfate, ammonium chloride, and so on. Ammonia-nitrogen wastewater mainly originates from industries such as chemicals, metallurgy, coal gas, coking, tanning, monosodium glutamate, meat processing, and breeding, as well as the discharge of wastewater and leachate from garbage. Ammonia-nitrogen wastewater is also toxic to fish and certain organisms. Moreover, when wastewater containing a small amount of ammonia-nitrogen is reused in industrial processes, it can be corrosive to certain metals, particularly copper, and can promote the proliferation of microorganisms in water supply pipelines and equipment, leading to the formation of biofouling that clogs pipes and devices. There are many methods for treating ammonia-nitrogen wastewater, with common ones currently including chemical precipitation, stripping, chemical oxidation, biological treatment, membrane separation, ion exchange, and soil irrigation. The editors of Zhongxiang Spring Environmental Technology will introduce the methods for treating ammonia-nitrogen wastewater.

Chemical Sedimentation Method
The chemical precipitation method, also known as MAP precipitation, involves adding magnesium compounds and phosphoric or phosphoric acid to wastewater containing ammonia nitrogen. This causes the NH4+ in the wastewater to react with Mg2+ and PO43- in the aqueous solution, forming magnesium ammonium phosphate precipitate with the molecular formula MgNH4PO4·6H2O, thereby achieving the removal of ammonia nitrogen.

Desorption Method
The blow-off method for ammonia-nitrogen removal involves adjusting the pH to alkaline levels, causing ammonia ions in the wastewater to convert to ammonia, predominantly in its free ammonia form. This free ammonia is then removed from the wastewater using a carrier gas, achieving the goal of ammonia-nitrogen removal. The blow-off method for ammonia-nitrogen removal is effective, simple to operate, and easy to control.

Chemical Oxidation Method
3.1 Breakpoint Chlorination Method
The mechanism of the breakpoint chlorination process for ammonia removal involves the reaction of chlorine gas with ammonia to produce harmless nitrogen gas, N2, which is released into the atmosphere, driving the reaction to proceed continuously to the right.
3.2 Catalytic Oxidation Method
The catalytic oxidation process, through the action of a catalyst, can oxidize and decompose organic matter and ammonia in wastewater into harmless substances such as CO2, N2, and H2O under specific temperatures and pressures, achieving the purpose of purification.
3.3 Electrochemical Oxidation Method
Electrochemical oxidation is a method that utilizes electrodes with catalytic activity to oxidize and remove pollutants from water. Factors influencing the process include current density, influent flow rate, effluent storage time, and electrolysis time.

Section 4: Biochemical Method
4.1 Traditional Biological Denitrification Technology
The traditional biological method involves a series of reactions, such as nitrification and denitrification, under the action of various microorganisms, converting ammonia nitrogen in wastewater into nitrogen gas, thereby achieving the goal of wastewater treatment.
4.2 Novel Biological Denitrification Technology
4.2.1 Simultaneous Nitrification and Denitrification (SND)
2.4.2 Short-path Denitrification Digestion
4.2.3 Anaerobic Ammonium Oxidation

Five: Membrane Separation Technique
Membrane separation techniques utilize the selective permeability of membranes to selectively separate components in liquids, thereby achieving the goal of ammonia nitrogen removal. This includes reverse osmosis, nanofiltration, and electrodialysis, among others. Factors affecting membrane separation methods include membrane characteristics, pressure or voltage, pH, temperature, and ammonia nitrogen concentration.

Ion Exchange Method
Ion exchange is a method for removing ammonia nitrogen from wastewater by utilizing materials that have a strong selective adsorption for ammonia ions.

Soil Irrigation
Soil irrigation is a method of using low-concentration ammonia-nitrogen wastewater directly as fertilizer. For ammonia-nitrogen wastewater containing pathogens, heavy metals, organic and inorganic harmful substances, it must be pre-treated to remove these before irrigation. Soil irrigation typically requires ammonia-nitrogen concentrations of tens of milligrams per liter.

Zhongxiang Spring Environmental Protection Technology Co., Ltd. utilizes a method of metal catalysis combined with photocatalytic catalytic oxidation to directly activate and oxidize ammonia nitrogen in wastewater under certain conditions. This converts the ammonia nitrogen in the wastewater into non-hazardous N2, which can be directly released into the air without generating solid waste. After treatment, the ammonia nitrogen content in the effluent can be reduced to the lower limit of the discharge standard or theoretically to zero. The core advantage of this solution is its short-term, stable, and efficient process, with minimal land use and a noticeable stable treatment effect. Therefore, it can truly address issues for wastewater with high ammonia nitrogen content, exceeding total phosphorus, total nitrogen, COD, and colony counts, as well as complex compositions, especially in medium and small-scale water volumes.