A combined model for describing the trans-membrane pressure (P) variation in constant flux dead-end microfiltration (MF) process. Issue 1 (February 2022)

• Record Type: Journal Article
• Authors: Du, Xinpei; Wang, Zhan; Chao, Liu
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 1(2022)
• Publication Date: 2022-02
• Subjects: Constant flux model -- Membrane fouling resistance -- Available membrane area ratio -- Membrane cleaning; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.107076
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In present paper, a constant flux model was established by dividing the trans-membrane pressure ( P ) into the partial pressure of the membrane layer ( P m ) (originating from the pore blocking/shrinking resistance of the membrane and the inherent membrane resistance) and the cake layer ( P c ) (originating from the resistance of the deposited cake layer) in constant flux dead-end filtration process with complex fouling mechanism. The pore resistance ( R p ) and the available membrane area ratio ( A/A 0 ) were determinated by using Hagen-Poiseuille law. In addition, the variations of model parameters ( K m, K p, K c and K ) in the filtration process before and after hydraulic/ultrasonic cleaning process were also discussed. Results showed that the model predictions had good agreements with experimental data at different conditions by using Bovine Serum Albumin (BSA) (R 2 =0.99), Humic acid (HA) (R 2 = 0.99), Sodium Alginate (SA) solutions (R 2 =0.99) and activated sludge (R 2 =0.99), kaolin (R 2 =0.99) and titanium dioxide suspensions (R 2 =0.99). Meanwhile, the available membrane area ratio decreased in the initial stage (pore blocking/shrinking and cake filtration) and keep constant in the following stage (cake filtration). Moreover, the variation of available membrane area ratio before and after hydraulic/ultrasonic cleaning process can be give a guidance to optimize the membrane cleaning process. Graphical Abstract: ga1 Highlights: The relationship between the pore resistance and the membrane area was established. The transmembrane pressure was divided into two partial pressures. The proposed model was validated by different membranes and feed suspensions. The results of the proposed model can give guidance on the membrane cleaning.