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Actual operating conditions and principles of self-cleaning filters

May 28, 2019

The filtration effect of the self-cleaning filter is related to the actual operating conditions, such as the flow rate of the particles and the filtration pressure. In order to achieve good filtration results, generally choose a lower flow rate, the lower the flow rate, the better the retention effect. Practice has shown that the structural movement of the membrane is detrimental to filtration. Once the structure of the membrane changes during the filtration process, the particles and fibers can be precipitated from the depth filter, affecting the filtration effect. However, the velocity/pressure differential has only a significant effect on the adsorption cut-off and has a relatively small effect on size exclusion.


Self-cleaning filters are suitable for liquid-solid separation applications such as lube oil filtration, filtration in the petrochemical industry, and wastewater treatment. Water filtration is an indispensable treatment in the purification process of fluids, mainly used to remove particulate matter or other suspended matter from fluids.


The principle of self-cleaning filters is to use a porous medium to remove contaminants from the fluid to achieve the desired level of cleanliness. The core of the filter is the filter membrane, which is a thin film filled with finer pores on the microporous support layer. There are many materials for making filters, which are classified into organic membranes (such as polysulfone hollow fiber membranes) and inorganic membranes. The membrane filter has high filtration precision, stable particle size control, and easy recovery performance. Therefore, it is extremely convenient to use and maintain.