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Microfiltration - Separation by pressure-driven membrane process.

Microfiltration is mainly used to separate suspended materials from dissolved substances. The applied pressure varies from process to process. Since microfiltration  is used to separate suspended materials, the employed pressures are fairly low: 0,1-2 bar.

Classification of Filter Cartridges by particle retention mechanism

  • Membrane (surface particle retention prevailing);
  • Pleated depth (combination of surface and depth particle retention mechanisms);
  • Fiber depth (particles are retained in the bulk of the filter material);
  • Absorption filtration (particles are retained by adsorption mechanisms);
  • Stainless steel mesh (sieve retention mechanism);
  • Full-metal depth (particles are retained in the bulk of filter material).

In addition, the filter elements are classified as HYDROPHOBIC (for filtering gas and liquid media) or HYDROFILE (for filtering liquids).

Features of the operation of filter cartridges

The filtering cartridges produced by Technofilter can be used both for preliminary and for final filtration of liquid and gaseous media. The correct choice of the filter is determined not only by the quality of the required product, but also by the economy of the system for each specific case.

Usually, before the membrane filters, depth filters are installed to pre-filter the process medium. Preliminary depth filters effectively reduce the biological load and remove most particles and colloidal contaminants that can prematurely clog the membrane finish filters, thereby increasing their efficiency and service life.

The choice of the filtration system depends on the characteristics of the medium to be filtered and on the specific process technology. In this case, it is necessary to take into account the particle size distribution and their concentration, viscosity, temperature of the medium to be filtered, chemical and thermal stability of the filter materials.

In industrial systems, the filtration process is expediently carried out in a cascade version: one or more (connected in parallel) filters of the same containment rating are the stage of the filtration cascade. In this case, if the cascade stages are selected correctly, the filtration is carried out with a gradual clogging of the pores of the filter elements of each stage.

Definition of filter terms

LIGHTING is a processing step used to remove sediment particles (suspensions) before further processing.

PREFILTRATION is the processing step used to extend the life of the subsequent (final) filter.

FINISH (STERILIZING) filtration is a processing step used to obtain a filtrate with a specified degree of purification, including sterile filtration.

Selecting a filtration system

SELECTION OF THE FILTRATION SYSTEM BEGINS WITH ANSWER TO THE FOLLOWING QUESTIONS:

  • what type of medium is being filtered (liquid or gas);
  • how polluted the medium is and what degree of purification is required;
  • what filter materials are compatible with the filtered medium at given operating temperatures and pressures;
  • what is the required capacity of the filtration system;
  • how many stages of filtration should be installed and with what fineness of purification to ensure maximum service life of the filter elements.

 


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