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Classification of filtration processes

Classification of filtration processes

(1) Sieve filter: The filter medium is a bar or strainer, which is used to remove coarse suspended solids such as weeds, rags, fibres, pulp, etc. Its typical equipment has grille, screen and micro-filter.
(2) microporous Filtration: The use of forming filter materials, such as filter cloth, filter, sintering filter, honeycomb filter, etc., can also be in the filter medium in advance coated with a layer of filter aid (such as diatomaceous earth) to form a small pore of the cake, to remove fine particle size. There are a lot of stereotyped commodity equipment.
(3) Membrane Filtration: The use of special semi-permeable membrane as a filter medium, in a certain driving force (such as pressure, electric field, etc.) under the filtration, because the membrane pore is very small and selective, you can remove the water bacteria, viruses, organic matter and dissolved solutes. The main equipment has reverse osmosis, ultrafiltration and electrodialysis and so on.
(4) Deep Filtration: The use of granular filter materials, such as quartz sand, anthracite and so on. Because of the pore between the filter particles, the waste water passes through a certain depth of the filter layer, the suspended substance is intercepted. For the difference between the above three kinds of surface or shallow layer filtration process, this kind of filtration is called the deep filtration, the short filter

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