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What is the working principle of an experimental ultrafiltration system?
Date: 2025-09-10Read: 8
The working principle of the Aitson experimental ultrafiltration system LDS-L2 is based on membrane separation technology, which is driven by pressure difference or centrifugal force, and utilizes the sieving effect of the ultrafiltration membrane to achieve molecular level separation. The core process includes:
1. Separation mechanism
The pore size of ultrafiltration membranes is usually between 0.001-0.1 microns, which can intercept large molecular substances such as bacteria, viruses, proteins (molecular weight range 1000-500000 Dalton), while allowing water, inorganic salts, and small organic molecules to pass through.
2. Dynamic filtering and cross flow design
Unlike vertical filtration, experimental ultrafiltration systems often use tangential flow (cross flow) filtration, where the original liquid flows parallel to the membrane surface to reduce membrane fouling. The intercepted impurities are discharged with the concentrated solution to avoid membrane pore blockage.
3. Operating conditions
Drive mode: pressure difference (0.1-0.7MPa) or centrifugal force.
Operating at room temperature, suitable for handling heat sensitive substances.
Regular backwashing or chemical cleaning is required to maintain membrane flux.
4. System composition
A typical experimental ultrafiltration system includes ultrafiltration membrane components (such as hollow fiber membranes or flat membranes), peristaltic pumps, pressure regulating devices, and collection tubes. Some systems integrate pre-processing units (such as filters) to protect membrane components.
The Aitson experimental ultrafiltration system LDS-L2 is mainly used in the fields of sample concentration, purification, dialysis, displacement buffer, and solution heat removal. During the process, the weight of the sample, pre membrane pressure, reflux pressure, permeation pressure, transmembrane pressure TMP, and other data can be displayed and recorded through a paperless recorder or LCD panel.
