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Filtration Spectrum

Microfiltration is one of the most common laboratory and industrial processes applied to separate microorganisms and colloid or suspended microparticles of 0.1-10 μm size from liquids and gases. Microfiltration holds an intermediate position between ultrafiltration and general filtration (macrofiltration). Microfiltration is a pressure-driven process; 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);
  • Adsorption 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 cartridges are classified as HYDROPHOBIC (for filtration of gaseous and liquid media) or HYDROPHYLIC (for filtration of liquids).

Features of the operation of filter cartridges

The filter cartridges produced by Technofilter RME Ltd can be used both for preliminary and for final filtration of liquid and gaseous media. Correct choice of the filter cartridge is determined not only by the quality of the required product, but also by the economic efficiency of a system for each specific case.

Usually, depth filters are installed before the membrane filters for pre-filtration of the process medium. Prefilters with higher particle retention capability decrease bioburden and remove most of particles and colloid contaminations that can prematurely block final (sterilizing) filters, thus enhancing their performance and lifetime.

Choice of a filtration system depends on particular characteristics of the medium being filtered and on specific process technology. Many factors should be taken into account along with that: nature and distribution of particles by sizes, their concentrations, medium viscosity, chemical and thermal resistance of filter material to the feed, quality of preliminary preparation of the feed etc.

In industrial systems it is reasonable to implement filtration process in cascades: one or more (connected in parallel) filters of the same retention rating as a 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 cartridges at each stage.

Definition of filtration terms

CLARIFICATION is a processing step used to remove sedimentary particles (suspensions) before further treatment.

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.

Selection of filtration system

SELECTION OF THE FILTRATION SYSTEM BEGINS WITH ANSWERING THE FOLLOWING QUESTIONS:

  • What type of medium is being filtered (liquid or gas)?
  • How contaminated 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 filtration stages should be installed and what fineness of purification should be to ensure maximum service life of the filter cartridges?

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