An optimized permanent magnetic nanoparticle recovery device (i.e., the MagNERD) was developed and operated to separate, capture, and reuse superparamagnetic Fe₃O₄ from treated water in-line under continuous flow conditions. Experimental data and computational modeling demonstrate how the MagNERD’s efficiency to recover nanoparticles depends upon reactor configuration, including the integration of stainless-steel wool around permanent magnets, hydraulic flow conditions, and magnetic NP uptake. The MagNERD efficiently removes Fe₃O₄ in the form of a nanopowder, up to > 95% at high concentrations (500 ppm), under scalable and process-relevant flow rates (1 L/min through a 1.11-L MagNERD reactor), and in varying water matrices (e.g., ultrapure water, brackish water). The captured nanoparticles were recoverable from the device using a simple hydraulic backwashing protocol. Additionally, the MagNERD removed ≥ 94% of arsenic-bound Fe₃O₄, after contacting As-containing simulated drinking water with the nanopowder. The MagNERD emerges as an efficient, versatile, and robust system that will enable the use of magnetic nanoparticles in larger scale water treatment applications.

To aid potable water treatment, a magnetic nanoparticle recovery device (MagNERD) containing removable permanent magnets was optimized and operated to capture superparamagnetic nanoparticles from polluted water in-line under flow conditions.

开发并运行了一种优化的永磁纳米颗粒回收装置（即MagNERD），以在连续流动条件下从处理过的水中分离，捕获和再利用超顺磁性Fe ₃ O ₄。实验数据和计算模型证明了MagNERD回收纳米颗粒的效率如何取决于反应堆的配置，包括永磁体周围不锈钢羊毛的整合，液压流动条件和NP的磁性吸收。MagNERD有效去除Fe ₃ O ₄以纳米粉的形式，在可扩展且与工艺相关的流速（通过1.11 L MagNERD反应器的流速为1 L / min）下以及在不同的水基质（例如，超纯水，微咸水）。使用简单的液压反冲洗方案可以从设备中回收捕获的纳米颗粒。此外，在将含As的模拟饮用水与纳米粉末接触后，MagNERD去除了≥94％的砷结合的Fe ₃ O ₄。MagNERD成为一种高效，多功能且坚固的系统，可将磁性纳米颗粒用于更大规模的水处理应用中。

为了帮助饮用水处理，对包含可移动永磁体的磁性纳米颗粒回收装置（MagNERD）进行了优化，并进行了操作，以在流动条件下在线从污水中捕获超顺磁性纳米颗粒。