【 Customer Question 】 How to clean a clogged reverse osmosis membrane?

　　【 Yuanlai Solution 】 Water supply and process water treatment (Separation, concentration, classification and purification)

　　In various industrial production processes, there is often a need to separate, concentrate, grade and purify a certain aqueous solution. The traditional methods used include processes such as sedimentation, filtration, heating, freezing, distillation, extraction and crystallization. These methods exhibit disadvantages such as long processes, high energy consumption, significant material loss, large equipment, low efficiency, and cumbersome operation. The economic benefits that can be achieved by replacing certain traditional technologies with ultrafiltration membrane technology.

　　The reverse osmosis system needs to be cleaned behind youROIt is recommended that you clean the system before it shows signs of contamination, after a long period of shutdown, or during regular maintenance as plannedROSystem. When the following pollution characteristics occur (the water production decreases after standardization)10~15%The quality of the produced water has declined after standardization10~15%Or the pressure drop between the feed water and the concentrated water increases10~15%When you do so, show yourROThe system needs cleaning.

　　BecauseROThe frequency at which a system needs to be cleaned due to dirt accumulation varies depending on the location. Generally, the acceptable cleaning frequency is3~12Once a month. If you have to clean more than once a month, you shouldROAdjust the pretreatment systemROThe operating parameters of the system, if each1~3If cleaning is required once a month, efforts should be made to improve the operational level of the current equipment, but it is difficult to determine whether the pretreatment system needs to be improved.

　　inROUsage is usually overlooked in designROThe dirt in the product water flushing system can be reduced by this methodROThe frequency of cleaning. Soak in the product water during the equipment shutdown periodROMembrane modules help dissolve scale and loose deposits, thus reducing the frequency of chemical cleaning.

　　The amount of dirt that needs to be cleaned varies depending on the location of the dirt. However, there are often more than one type of contaminants present, which complicates the problem. Common types of contaminants include

　　Calcium carbonate scale

　　Calcium sulfate, barium sulfate and strontium sulfate scale

　　Metal oxides of iron, manganese, aluminium, etc

　　Silicon dioxide

　　Colloidal deposits (inorganic or inorganic/Organic mixture

　　Natural or synthetic organic matter

　　Biomass (biological sludge, mold or

　　There are many factors related to choosing the appropriate cleaning chemicals and the correct cleaning methods. When you have your first cleaning, it is recommended that you contact the equipment manufacturerROMembrane module manufacturerROContact the system-specific supplier. Once the type of contamination has been identified, it is recommended to use one or more types of cleaning methods. These might be regular ones that can be purchased from many suppliers, or they could be specialized cleaning solutions. Such specialized cleaning solutions might be more expensive, but they are easier to use. Moreover, Yuanlai Water Treatment Company also has the advantage of providing technical support. Yuanlai Water Treatment Company offers more valuable services. Yuanlai will take the membrane modules taken from your system back for testing to select the correct cleaning and method.

　　Usually, various cleaning methods need to be used in a specific order for cleaning to achieve a good cleaning effect. For example, use low firstpHIt is necessary to clean and remove substances such as scale, and then use a high onepHThe cleaning solution is used to remove organic matter. But sometimes high is used firstpHUse a cleaning solution with a certain value to remove oily dirt, and then use a low-grade onepHA valuable cleaning solution. Some cleaning solutions also contain detergents, which will help remove severely contaminated biological and organic impurities. Other cleaning additives includeEDTASuch chelating agents, which help to remove colloids, organic matter, biological impurities and sulfate scale. It should be remembered that choosing the wrong cleaning method or following incorrect cleaning procedures may make the clogging more severe.

　　There are some points to note when choosing to clean and use composite polyamide membranes

　　Adhere to the manufacturer's recommended selection list, dosage,pHValue, temperature and contact time.

　　Use less corrosive materials to complete the cleaning work. These actions will extend the service life of the membrane.

　　In regulationpHWhen determining the value, one must be cautious to extend the service life of the membrane. Less corrosivepHThe value range is4~10PermittedpHThe value range is2~12.

　　Acids and bases should not be mixed. Before adding the next solution, thoroughly flush the system to drain all the cleaning solution from the previous operation.

　　Use highpHUse the product water to rinse out the detergent.

　　Confirm compliance with the correct cleaning solution handling requirements.

　　The above solutions are provided by Beijing Yuanlai Water Treatment Equipment Co., LTD. If you have any questions or need consultation, please call us!