Nitrogen pollution is a global issue impacting ecosystems, climate change, human health, and the economy. The challenge to reduce nitrogen pollution as a priority highlights the wastewater treatment system an important point of control. Coagulation, a common water treatment process, has a positive impact on the overall treatment process but often struggles to address nitrogen pollution effectively. Our study introduces a novel magnetic seed to enhance coagulation in treating nitrogen pollution, offering a new solution for the global water treatment industry. We focus on the efficiency, mechanistic detail, and recovery potential of a magnetic zirconium tannate in treating real-world wastewater nitrogen under coagulation conditions. Results show that 9 g/L of magnetic zirconium tannate effectively removes ammonia nitrogen, organic nitrogen, and total nitrogen from five different wastewater types. For low-concentration wastewater with ammonia nitrogen below 20 mg/L and organic nitrogen below 5 mg/L, removal rates reach up to 100%. For high-concentration wastewater with ammonia nitrogen below 98 mg/L and organic nitrogen below 86 mg/L, the maximum removal rate is 59% for ammonia nitrogen and 88% for organic nitrogen. Spectral analysis reveals that magnetic zirconium tannate adsorbs nitrogen compounds in water through both hydrogen bonding and electrostatic interactions, achieving excellent treatment outcomes. It can be efficiently recovered without using complex organic eluents and is easily separated from the flocculate. This technology offers non-disruptive supplement for current treatment approaches to meet the global nitrogen pollution challenge head on.

氮污染是一个影响生态系统、气候变化、人类健康和经济的全球性问题。以减少氮污染为优先的挑战凸显了废水处理系统的一个重要控制点。混凝是一种常见的水处理工艺，对整个处理过程具有积极影响，但往往难以有效解决氮污染问题。我们的研究引入了一种新型磁性种子来增强混凝处理氮污染，为全球水处理行业提供了新的解决方案。我们重点研究磁性单宁酸锆在混凝条件下处理现实废水氮的效率、机制细节和回收潜力。结果表明，9 g/L 磁性鞣酸锆可有效去除五种不同废水类型中的氨氮、有机氮和总氮。对于氨氮低于20mg/L、有机氮低于5mg/L的低浓度废水，去除率可达100%。对于氨氮低于98毫克/升、有机氮低于86毫克/升的高浓度废水，氨氮最高去除率为59%，有机氮最高去除率为88%。光谱分析表明，磁性鞣酸锆通过氢键和静电相互作用吸附水中的氮化合物，取得了良好的处理效果。它无需使用复杂的有机洗脱剂即可有效回收，并且易于与絮凝物分离。该技术为当前的处理方法提供了无破坏性的补充，以应对全球氮污染的挑战。