Reverse osmosis membrane cleaning and maintenance method

Reverse osmosis technology is increasingly widely used in water treatment because of its high desalination rate. The cleaning problem of reverse osmosis water purification equipment may cause losses to many users with weak technical strength. Usually, the reverse osmosis membrane is generally cleaned every 3 to 12 months. If it has to be cleaned once a month, it means that it should be improved. Pretreatment system, adjusted operating parameters. 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.

Let me introduce the relevant knowledge of reverse osmosis membrane cleaning: 1. Low-pressure flushing reverse osmosis equipment Regularly flush the reverse osmosis equipment with large flow, low pressure, and low pH value to help remove the dirt attached to the membrane surface and maintain membrane performance , or when the SDI of the water entering the reverse osmosis equipment suddenly rises above 5.5, low-pressure flushing should be performed, and the machine should be turned on after the SDI value is adjusted to pass. 2. Outage protection of reverse osmosis equipment Due to fluctuations in production, reverse osmosis equipment will inevitably be shut down frequently, and protective measures must be taken during short-term or long-term outages. Improper treatment will cause membrane performance to decline and cannot be recovered. Short-term storage is suitable for systems that have been shut down for less than 15 days, and 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 stink and deteriorate after being stored for 3 days, and a large number of bacteria will multiply. Therefore, it is recommended that when the water temperature is higher than 20°C, it should be flushed once every 2 days or 1d with low pressure, and when the water temperature is lower than 20°C, it can be washed once every 3 days with low pressure. . Long-term shutdown protection is suitable for systems that have been shut down 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 membrane) is formaldehyde 10 (mass fraction), isothiazolinone 20mg/L, sodium bisulfite 1 (mass fraction) 3. Under normal operating conditions, the reverse osmosis membrane chemical cleaning is also It may be polluted by inorganic scales, colloids, microorganisms, metal oxides, etc. These substances deposited on the membrane surface will cause a decrease in the output of the reverse osmosis device of the water purification equipment or a decrease in the desalination rate, an increase in the pressure difference, and even cause irreversible damage to the membrane. Damage, therefore, requires chemical cleaning of the membrane in order to restore good water permeability and salt removal performance. Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..