This study presents a new modeling approach for nitrogen recovery for gas-permeable membrane (GPM) contactors, including both ammonia and water transport dynamics. A distinct feature of the model is its capacity to model water transport across the membrane, which has been overlooked in most publications. Osmotic pressure differences are used to predict the behavior of ammonia and water transport in the GPM. Experiments carried out to develop, test and calibrate the model examined the dynamics of ammonia and water transport through the GPM at various nitrogen concentrations. Specifically, the GPM contactor was tested for nitrogen recovery from high-strength synthetic wastewaters (2.4-10.6 g N/L) at 35°C and at pH 9. The initial volume of the trapping solution (diluted H₂SO₄) was 10 times lower than that of the synthetic wastewater, aiming to concentrate the recovered nitrogen. The estimated ammonia transport constant (K_m) ranged between (1.2 – 2.1)·10^-6 m/s and water transport constant K_w between (2.8 – 8.2)·10^-10 m/(s bar). Numerical determination of the model parameters revealed high R² values, demonstrating strong agreement with experimental data.

中文翻译：

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对透气膜中的氮回收和水输运进行建模


本研究提出了一种新的气体渗透膜 （GPM） 接触器氮回收建模方法，包括氨和水的传输动力学。该模型的一个显着特点是它能够模拟水穿过膜的传输，这在大多数出版物中都被忽视了。渗透压差用于预测 GPM 中氨和水的运输行为。为开发、测试和校准该模型而进行的实验检查了氨和水在各种氮浓度下通过 GPM 的传输动力学。具体来说，在 35°C 和 pH 值为 9 的条件下，对 GPM 接触器进行了从高强度合成废水 （2.4-10.6 g N/L） 中回收氮的测试。捕集溶液（稀释的 H₂SO₄）的初始体积比合成废水的初始体积低 10 倍，旨在浓缩回收的氮。估计的氨传输常数 （K_m） 在 （1.2 – 2.1）·^10-6 m/s 之间，水传输常数 K_w 在 （2.8 – 8.2）·^10-10 m/（s bar） 之间。模型参数的数值测定显示 R² 值较高，与实验数据高度一致。