Magnetic-Seeding Filtration*

Abstract

DISCLAIMERABSTRACT Magnetic-seeding filtration consists of two steps: heterogeneous particle flocculation of magnetic and nonmagnetic particles in a stirred tank and high-gradient magnetic filtration (HGMF). The effects of various parameters affectipg magneticseeding filtration are theoretically and experimentally investigated. A trajectory model that includes hydrodynamic resistance, van der Waals, and electrostatic forces is developed to calculate the flocculation frequency in a turbulent-shear regime. Fractal dimension is introduced to simulate the open structure of aggregates. A magneticfiltration model that consists of trajectory analysis, a particle build-up model, a breakthrough model, and a bivariate population-balance model is developed to predict the breakthrough curve of magnetic-seeding filtration. A good agreement between modeling results and experimental data is obtained. The results show that the model developed in this study can be used to predict the performance of magnetic-seeding filtration without using empirical coefficients or fitting parameters.

Concentrating Dilute Sludge Wastes with High-Gradient Magnetic Separation: Breakthrough Experiments and Performance

“…[21][22][23][24][25][26][27][28] Other applications of HGMS include environmental remediation and nuclear waste treatment, 27,[28][29][30][31][32][33] particularly as a downstream collector of magnetically seeded nonmagnetic particles and ionic species. 6,9,31,[34][35][36][37] An excellent example of this kind of HGMS technology is the SIROFLOC process. 38 The versatility of HGMS has also allowed for its expansion into phase separations, 14,[39][40][41] as well as into more novel uses such as the separation and segregation of biomolecules and cells by using bio-labeled magnetic carriers, [42][43][44][45][46][47] a growing area.…”