Cleaning method of ultrafiltration filter element after contamination

In the actual application of filter element separation technology, although a more suitable ultrafiltration filter element and suitable operating conditions are selected, in long-term operation, the separation material and other impurities will gradually accumulate on the surface of the filter element, which will cause pollution and blockage of the filter element. , thereby affecting the water flux and service life of the ultrafiltration filter element. Therefore, regular and effective cleaning of the filter element is an important guarantee for restoring the water flux of the ultrafiltration filter element and prolonging its service life. In practice, the commonly used cleaning methods are chemical cleaning and physical cleaning. In the daily maintenance of the ultrafiltration filter element, the physical cleaning method is generally used. Physical cleaning is divided into the following three different methods: 1. Isobaric flushing: that is, close the ultrafiltration water valve, open the concentrated water outlet valve, and increase the The flow rate flushes the surface of the filter element, which is very effective for removing a large number of loose impurities on the surface of the filter element. 2. High-purity water cleaning: As the purity of the water increases, the solubility is enhanced. When cleaning, you can first use ultra-filtered water to wash off the loose dirt on the filter element surface, and then use pure water to circulate and clean. 3. Backwashing: that is, the cleaning water enters from the ultrafiltration port of the filter element and passes through the filter element, and rushes to the side of the concentration port. The backwashing method can effectively remove the coverage, but special attention should be paid during backwashing to prevent overpressure and avoid Break the filter element or destroy the sealing surface. When the filter element is seriously polluted and the flux cannot be recovered by physical methods, it must be cleaned with a chemical cleaning agent, and the purpose of cleaning the filter element is achieved by chemical reaction between chemicals and impurities on the filter element surface. There are also certain principles when selecting chemicals. First, no chemical reaction can occur with other materials of the filter element and components; second, the selected chemicals avoid secondary pollution. Here are some introductions for you: 1. Acid solution cleaning: Common solutions include hydrochloric acid, citric acid, oxalic acid, etc. The pH of the solution is 2~3, and the cyclic cleaning or soaking for 0.5h~1h is used to remove inorganic impurities. The effect is better. 2. Alkaline solution cleaning: The commonly used alkalis are mainly sodium hydroxide, potassium hydroxide and sodium carbonate. The PH value of the alkaline solution is also determined by the type of filter element material, generally around PHu003d10~12. Use water circulation operation to clean or soak for 0.5h~1h and then cycle cleaning, which can effectively remove impurities and grease. 3. Oxidant cleaning agent: Use 1%~3% H2O2, 500~1000mg/L NaClO and other aqueous solutions to clean the ultrafiltration filter element, which can remove dirt and kill bacteria. H2O2 and NaClO are commonly used fungicides. 4. Enzymatic detergents: such as 0.5%~1.5% pepsin, trypsin, etc., are effective for removing protein, polysaccharide and oil pollutants.
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