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Spectrum filtration

Microfiltration is one of the most common laboratory and industrial processes and is used to isolate from liquids and gases of colloidal or suspended microparticles 0.1 ... 10 μm in size, as well as microorganisms. Microfiltration occupies an intermediate position between ultrafiltration and normal filtration (macrofiltration) without sharply defined boundaries.

Classification of produced filters

The filtering elements produced by Technofilter under the particle retention mechanism are divided into MEMBRANE (the surface confinement of particles predominates), DEPTH (particle retention occurs mainly in the volume of the filter material) and SORPTION FILTERS (particle retention occurs due to adsorption mechanisms). At the same time, cartridge-type elements operate in a dead-end microfiltration mode. In addition, the filter elements are classified as HYDROPHOBIC (for filtration of gas and liquid media) or HYDROFILE (for filtration of liquids), according to the method of packing the filtering material they are divided into GFR or NONGOFRATED, and, depending on the volumes of filtration, they differ in constructive design - disks, capsules, mini-cartridges, standard cartridges (cartridges).

Features of the operation of filter elements

The filtering elements 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, deep 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 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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