Nitrogen in water will induce active biogeochemical effects, such as denitrification and anammox, which release N₂O, a greenhouse gas, leading to increasing global warming. Therefore, it is necessary to find an economical and efficient method to treat ammonia nitrogen in the field of wastewater treatment. In this study, two cation exchange resins, D61 and D708, were selected to analyze external environment conditions suitable for the adsorption of ammonia nitrogen by conducting orthogonal experiments. The kinetic and thermodynamic mechanisms were discussed, and cation exchange resins with a high selectivity to NH₄⁺ were selected. The optimum adsorption temperature, pH, and rotation speed for the D61 resin were found to be 32°C, 5, and 150 r/min, respectively. The optimum adsorption temperature and rotation speed for the D708 resin were 40°C and 150 r/min, respectively. The kinetic data could be accurately described using the pseudo-second-order kinetic equation. The results showed that physical and chemical adsorption mechanisms may coexist in the adsorption of NH₄⁺-N. The adsorption process can easily occur and that it is not limited by the pH or rotational speed. The maximum adsorption capacities of the D61 and D708 resins were 44.93 and 31.34 mg/g, respectively; removing ammonia nitrogen from 1 m3 of wastewater requires only 100–110 g of ion exchange resin. The cost is $1.78/m³ of raw wastewater treated. This is a good alternative to other nitrogen removal systems, particularly in comparison with conventional physicochemical methods and the nitrification–denitrification biochemical process employed currently.

中文翻译：

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离子交换树脂处理高浓度氨氮废水

水中的氮会引起活跃的生物地球化学效应，例如反硝化作用和厌氧氨氧化作用，它们会释放温室气体 N ₂ O，导致全球变暖加剧。因此，在废水处理领域寻找一种经济高效的氨氮处理方法势在必行。本研究选择两种阳离子交换树脂D61和D708，通过正交实验分析适合氨氮吸附的外部环境条件。讨论了动力学和热力学机理，以及对NH ₄ ^{+具有高选择性的阳离子交换树脂}被选中。D61 树脂的最佳吸附温度、p​​H 值和转速分别为 32°C、5 和 150 r/min。D708树脂的最佳吸附温度和转速分别为40°C和150 r/min。动力学数据可以使用准二级动力学方程准确描述。结果表明，NH ₄ ⁺ -N的吸附可能同时存在物理和化学吸附机制。吸附过程很容易发生，并且不受 pH 值或旋转速度的限制。D61 和 D708 树脂的最大吸附量分别为 44.93 和 31.34 mg/g；从 1 m3 废水中去除氨氮仅需 100–110 g 离子交换树脂。成本为 $1.78/m ³处理的原废水。这是一个很好的替代其他脱氮系统的方法，特别是与传统的物理化学方法和目前采用的硝化-反硝化生化工艺相比。