Tahmid Mohammed, Joo Choi Hyuck, Ganapavarapu Sai Tarun, Scott Joseph, Hatzell Marta C
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States.
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 770 Ferst Drive NW, Atlanta, Georgia 30332, United States.
Environ Sci Technol Lett. 2024 Nov 5;11(12):1413-1419. doi: 10.1021/acs.estlett.4c00595. eCollection 2024 Dec 10.
Recovery of nitrogen from wastewater presents a unique opportunity to valorize waste and contribute to a more circular nitrogen economy. However, dilute solution separations are challenging for most state-of-the-art separations technologies. This often results in technologies having low concentration factors that result in low-value products (e.g., < 1 wt % N). Here, we demonstrate how a cascading electrodialysis system combined with a hollow fiber membrane contactor (ED+HFMC) system can achieve efficient recovery of ammonia from simulated centralized animal feeding operation (CAFO) wastewater. The integrated system achieved an overall concentration factor of ∼200× (∼40× in ED and ∼5× in HFMC). This resulted in a ∼10 wt % NH -N fertilizer product. The specific energy consumption (SEC) for the three stages of the ED was 1.89-6.14 kWh/kg NH -N, which is lower than that of the Haber-Bosch process (8.9-19.3 kWh/kg N). Operating costs were <$0.90/kg NH -N for each of the electrodialysis stages and NH stripping. This integrated ED+HFMC system holds promise for the recovery of ammonia from dilute feedstreams as the ED+HFMC achieves high concentration factors and has low energy demand.
从废水中回收氮为废物增值以及推动更循环的氮经济提供了独特机遇。然而，对于大多数先进的分离技术而言，稀溶液分离颇具挑战。这常常导致技术的浓缩倍数较低，从而产生低价值产品（例如，氮含量<1 wt%）。在此，我们展示了一种级联电渗析系统与中空纤维膜接触器（ED+HFMC）相结合的系统如何能够从模拟的集中式动物饲养场（CAFO）废水中高效回收氨。该集成系统实现了约200倍的总浓缩倍数（电渗析阶段约40倍，中空纤维膜接触器阶段约5倍）。这产生了一种氮含量约为10 wt%的氨 - 氮肥料产品。电渗析三个阶段的比能耗（SEC）为1.89 - 6.14 kWh/kg氨 - 氮，低于哈伯 - 博施法（8.9 - 19.3 kWh/kg氮）。电渗析各阶段以及氨汽提的运行成本均低于0.90美元/kg氨 - 氮。这种集成的ED+HFMC系统有望从稀进料流中回收氨，因为ED+HFMC实现了高浓缩倍数且能源需求较低。
