Method for separating high flux and low pollution membrane with biomimetic spiral membrane

Abstract

The invention relates to a method for separating a high flux and low pollution membrane with a biomimetic spiral membrane, belonging to the technical field of membrane separation. The method aims to establish the efficient membrane separation components by using a biomimetic principle, lighten concentration difference polarization and membrane pollution, improve the membrane flux and reduce energy consumption. The invention is characterized in that flat membranes and hollow fibre parallel arrangement membrane components keep the characteristics of the biomimetic spiral membrane structure in space through the outside fixing method, the inside support structure and shape maintaining method or the combination of the two methods, and the distribution, the interaction and the change mode of membrane and the flow field in membrane separation are changed. The vibration and swing of the membranes are caused by the washing and the disturbing of the flow. The invention has the effect and advantages that under the premises that the material consumption and the energy consumption are not increased in the membrane separating process, mass transfer is strengthened, membrane pollution is lightened, and dynamic membrane operating effect is favorable. The method has obvious social and economic benefits and has wide application prospect in the fields of chemical industry separation, water treatment, medicine separation and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation. The invention relates to a high-throughput and low-contamination membrane separation method using a bionic spiral membrane. Specifically, it involves the use of a simple and easy bionic spiral membrane structure, which changes the traditional fluid flow field distribution and membrane surface interaction and disturbance mode, improves the sensitivity of the membrane module to fluid disturbances such as water and gas, and generates membrane vibration and swing. Reduce concentration polarization in membrane separation, reduce membrane fouling, and improve membrane separation efficiency and flux. Reduce membrane separation energy consumption. Background technique [0002] Membrane separation process is an efficient separation operation, which has been widely used in many industries in recent years. The bottleneck problem that restricts the further improvement of efficiency of membrane...

AI Technical Summary

Problems solved by technology

Not conducive to the use of flow field disturbance

[0005] (2) Add suspended fillers, such as organic materials, activated carbon or organic-inorganic composite fillers, to form dynamic membranes and control membrane fouling to slow down and inhibit the decline in membrane flux, which is usually used in flat membranes. (P Bai, X Chen, J Wang, Development of high flux, low air scoured and less backwashed Dynamic filter to realize low cost membrane bioreactor-a pilot scaledemonstration in sewage treatment., 5th IWA specialized membrane technology conference for water and wastewater treatment. IWA Membrane Beture conference2 and exhibition , ID074) This approach increases material consumption

[0006] (3) Study new anti-pollution membrane materials, such as antibacterial / improving hydrophilicity, reducing the adsorption and deposition of pollutants; anchoring / designing materials with comb-like molecular structures on the surface; increasing surface negative charges; this method focuses on chemical reactions and material modification (Fangang Meng, So-Ryong Chae, Anja Drews, Matthias Kraume, Hang-Sik Shin, Fenglin Yang, Recent advances in membrane bioreactors (MBRs): Membrane fouling and membrane material, Water Research, Volume 43, Issue 6 , April 2009, 1489-1512) This method also increases the cost and consumption of chemical processing materials

[0007] (4) Optimizing membrane separation operating conditions, adjusting the size of sludge particles, such as adding cationic polymers or ions to water, changing the properties of sludge, biological macromolecules, especially EPS (granulation), and reducing adsorption and Sedimentation (B, Siembida, P Cornel, S Krause, B Zimmerman, Studies on fouling and its prevention in MBR.5th IWA specialized membrane technology conference for water and wastewater treatment. IWA Membrane conference and exhibition, 2009Beijing. Abstract Book, ID584.) The operation and adjustment of the method is complicated, cannot be changed according to the specific situation, time-consuming and difficult to master

Using the elasticity and structural resilience of the material itself, the response to the disturbance of airflow and water flow in water produces horizontal and vertical vibrations, which solves the problem of membrane module structure stiffness, increases the filling area, reduces pollution, increases flux, and saves energy. At present, there is no other research report on this kind of membrane separator

Images