BackgroundOperation mode
Low-pressure flushing reverse osmosis device
Regular flushing of the reverse osmosis device with high flow, low pressure, and low pH is helpful to strip off the dirt attached to the membrane surface and maintain membrane performance, or when the reverse osmosis device feed water SDI suddenly rises above 5.5, you should Carry out low-pressure flushing, and turn on the machine after the SDI value is adjusted to a qualified value.
Outage protection of reverse osmosis device
Due to production fluctuations, reverse osmosis devices will inevitably be shut down frequently, and protective measures must be taken when short-term or long-term shutdowns. 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. The method of low-pressure flushing every 1 to 3 days can be used to protect the reverse osmosis device. Practice has found that when the water temperature is above 20°C, the water in the reverse osmosis device will become smelly and deteriorated 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) and sodium bisulfite 1 (mass fraction).
Cleaning method
Chemical cleaning of reverse osmosis membrane
Under normal operating conditions, the reverse osmosis membrane may also be contaminated by inorganic scales, colloids, microorganisms, metal oxides, etc., these substances deposited on the membrane surface will cause the output of the industrial reverse osmosis device to decrease or the desalination rate to decrease, and the pressure difference to increase , And even cause irreversible damage to the membrane. Therefore, in order to restore good water permeability and salt removal performance, the membrane needs to be chemically cleaned.
In summary
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 cleaning is required 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.
