Three cleaning methods of reverse osmosis equipment, you must know!

Three cleaning methods of reverse osmosis equipment, you must know!

             Reverse osmosis technology has been widely used because of its special advantages. The cleaning problem of reverse osmosis water purification equipment may cause many users with weak technical strength to suffer losses, so it is necessary to do a good job in the management of reverse osmosis equipment to avoid serious problems.

              1. Low-pressure flushing of reverse osmosis equipment. Regular flushing of reverse osmosis equipment with large flow, low pressure and low pH is beneficial to stripping off the dirt attached to the membrane surface and maintaining membrane performance, or when the reverse osmosis equipment enters the SDI suddenly When the increase exceeds 5.5, low-pressure flushing should be carried out, and the SDI value should be adjusted to qualified before starting the machine.

              2. Chemical cleaning of the reverse osmosis membrane. Under normal operating conditions, the reverse osmosis membrane may also be contaminated by inorganic dirt, colloids, microorganisms, metal oxides, etc. The deposition of these substances on the membrane surface will cause the output of the reverse osmosis device of the water purification equipment Decrease or decrease in desalination rate, increase in pressure difference, and even cause irreversible damage to the membrane. Therefore, in order to restore good water permeability and desalination performance, the membrane needs to be chemically cleaned.

              Generally, it is cleaned once every 3 to 12 months. If it has to be cleaned once a month, it indicates the pretreatment system that should be improved and the operating parameters to be adjusted. If it needs to be cleaned once every 1 to 3 months, the operation level of the equipment needs to be improved, and it is difficult to judge whether the pretreatment system needs to be improved.

             3. Reverse osmosis equipment shutdown protection. Due to production fluctuations, reverse osmosis equipment will inevitably be shut down frequently. Protective measures must be taken when short-term or long-term shutdown. Improper handling will result in membrane performance degradation and irreversibility. Short-term storage is suitable for systems that are out of service for less than 15 days, and the method of low-pressure flushing every 1 to 3 days can be used to protect the reverse osmosis equipment.

             Practice has found that when the water temperature is above 20°C, the water in the reverse osmosis equipment will become smelly and deteriorate after 3 days, and a large number of bacteria will multiply. Therefore, it is recommended that when the water temperature is higher than 20℃, low-pressure flushing once every 2d or 1d; when the water temperature is lower than 20℃, low-pressure flushing once every 3d is recommended. After each flushing, all inlet and outlet valves on the reverse osmosis device of the water purification equipment should be closed. . Long-term deactivation protection is suitable for systems that are out of service for more than 15 days. At this time, protection liquid (bactericide) must be filled into the reverse osmosis device of the water purification equipment for protection. The commonly used bactericide formula (composite film) is formaldehyde 10 (mass fraction), isothiazolinone 20mg/L, and sodium bisulfite 1 (mass fraction).