含氨氮矿井水处理技术现状及展望

As the discharge standards for mine water treatment become more stringent, therequirements for effective removal of ammonia nitrogen from mine water are strongly needed. Whilethere are several methods available for treating ammonia nitrogen in wastewater, there is relativescarcity of literature addressing the treatment of mine water specifically containing ammonia nitrogen. Toaddress this issue, this paper conducted a comprehensive analysis of the sources and characteristics ofammonia nitrogen in mine water. It also reviewed various primary technologies used for treating low con⁃centrations of ammonia nitrogen in wastewater, including ion exchange, adsorption, oxidation, mem⁃brane separation, and biological methods. The paper aimed to provide technical support for the treat⁃ment of ammonia nitrogen-containing mine water in China. The findings of the study reveal that ammo⁃nia nitrogen in mine water primarily originates from three sources: Naturally high ammonia nitrogencontent in groundwater, the usage of emulsion, dust suppressants, grouting, and gelling materials inthe underground coal production process, and the lateral recharge from polluted surface watercontaining ammonia nitrogen. Ammonia nitrogen-containing mine water is characterized by relativelylow ammonia nitrogen content (generally <5 mg / L), neutral or slightly alkaline pH, and generally lowchemical oxygen demand (COD) levels. In order to control the generation of ammonia nitrogen at itssource, it is recommended to minimize the use of raw materials containing nitrogen in coal mining pro⁃duction processes. Additionally, it is advised to collect, treat and manage production waste liquids andexcreta. For mine water with low concentrations of ammonia nitrogen (<2 mg / L), oxidation is consid⁃ered a more reasonable treatment choice. On the other hand, for mine water with higher ammonia nitro⁃gen content, biological treatment is a cost-effective approach. Considering the varying water qualitycharacteristics of mine water with different concentrations of ammonia nitrogen, future developmenttrends should focus on the research and development of corresponding chemical oxidation and biologicaltreatment technologies.