There are various cleaning methods for stainless steel filter elements, and each has its own advantages. Here are some common cleaning methods:
1. ** Ultrasonic cleaning method **[^1^] : Put the stainless steel filter element into the ultrasonic cleaning tank containing the cleaning liquid, set the cleaning time and temperature and other parameters to open the ultrasonic cleaning equipment. After cleaning, the filter element is dried with clean air. This method can thoroughly remove the dirt and impurities inside the filter element, and will not cause mechanical damage to the filter element. It is suitable for the filter element with complex structure and small pores.
2. ** Baking and cleaning method ** : put the filter element into the oven, set the appropriate temperature and time to bake, in order to remove the oil and impurities on the filter element. However, this method is now used relatively infrequently [^1^].
3. ** Reverse water cleaning method (backwashing method) **[^1^][^2^] : using inert gas, such as nitrogen, to the reverse direction of the stainless steel filter element filtration for backwashing. This method can effectively remove the sediment and suspended matter in the filter layer, and prevent the filter material from solidification, so that it can fully restore the sewage interception ability, so as to achieve the purpose of cleaning.
4. ** Solution cleaning method ** : Soak the stainless steel filter element with 5% sodium hydroxide solution or nitric acid solution for about 1 hour, according to the degree of pollution of the filter element to extend or shorten the soaking time, and then dry the filter element with clean air [^1^].
5. ** Acid cleaning method ** : potassium dichromate or crystal with water dissolved to 60 to 80 degrees, slowly add a concentration of 94% sulfuric acid to the full amount, add to 1200 ml potassium acid or completely dissolved, the solution color is dark red. This cleaning solution can remove the general pollutants, grease and metal particles impurities on the wall of the stainless steel filter element, and can effectively kill the bacterial microorganisms growing on the filter element and destroy the heat source. If the filter element has been washed with alkali before, the lye must be washed first, otherwise the fatty acid will precipitate and contaminate the filter element [^2^].
In summary, there are various cleaning methods for stainless steel filter elements, and it is necessary to choose the appropriate cleaning method according to the actual situation in the application. At the same time, the cleaning process should pay attention to the safety of standard operation, avoid unnecessary damage to the filter element.