Abstract
In this paper, we propose a calculation model for a crossflow filtration process that is applicable to polydispersed slurry microfiltration. The deposition velocity of particles in slurry, particle distribution, and resistance of the filter cake on the surface of the filtration media can be predicted by this model, and can be used to predict the variations of filtration velocity. The theoretical prediction matched well with the experimental data, having a difference within 20%, except for the initial few seconds. However, the porosity of the filter cake used in the theoretical prediction was assigned based on the literature. It is revealed by the model that the variations in the crossflow filtration velocity are induced by the gradual domination of particles with small diameters in the filter cake. Meanwhile, the possible direction for the optimization of this model is pointed out.
Highlights
A special form of filtration that is widely applied in fields such as medicine, blood separation, sewage treatment, water purification, food, biotechnology, and petroleum [1,2,3,4,5,6,7,8,9,10,11,12,13,14] is called crossflow filtration
The filtration velocity gradually reduces to equilibrium, which is a major disadvantage of crossflow filtration
The filtration velocity variation during the filtration must be accurately predicted in order to expand the industrial application of crossflow filtration
Summary
A special form of filtration that is widely applied in fields such as medicine, blood separation, sewage treatment, water purification, food, biotechnology, and petroleum [1,2,3,4,5,6,7,8,9,10,11,12,13,14] is called crossflow filtration. Crossflow filtration exhibits promising application prospects in the separation of water and solid particles from sludge. In this process, the filtration velocity gradually reduces to equilibrium, which is a major disadvantage of crossflow filtration. For micrometer-sized particles, the equilibrium filtration velocity based on the concentration polarization theory is generally one to two orders of magnitude lower than the experimental values [16]. According to this disagreement, it is inappropriate to consider
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