The RO reverse osmosis membrane plays a decisive role in the water purification process of the reverse osmosis water purifier. However, in the actual operation process, due to various reasons, the household reverse osmosis membrane will be blocked, causing the machine to fail to operate normally and affecting our daily drinking water. So, what are the main reasons for the blockage of the reverse osmosis RO membrane?

1. Improper pre-filtration assembly causes physical blockage;

2. Improper pressure regulation causes small concentrated water output, high working pressure, and the reverse osmosis membrane is in a high-pressure state, which accelerates the deposition of calcium and magnesium ions. The longer the time, the more irreversible it is;

3. The content of organic matter and microorganisms in the influent water is too high, forming organic mucous membrane fouling on the membrane surface, blocking the water permeability of the reverse osmosis membrane;

4. The hardness of the influent water is too high (the concentration of calcium and magnesium ions is too high), causing calcium and magnesium ions to deposit on the membrane surface, forming insoluble carbonate scale, which prevents water from passing through the reverse osmosis membrane.

When encountering a blockage like this, what measures should be taken to clean it?

1. Chemical cleaning Chemical cleaning is an effective method for any type of pollution. For the gel layer formed on the membrane surface by macromolecular substances, physical cleaning alone is not very effective. The polluted membrane can be soaked and cleaned with acid or alkali solution. Organic matter, silica and biological pollutants are easy to be cleaned under alkaline conditions, and some metal ion pollution is easy to be dissolved under acidic conditions. Surfactants and chelating agents can remove firmly attached substances. For different types of pollution suffered by RO reverse osmosis membranes, the selection of chemical agents should be targeted to prevent chemical cleaning agents from damaging the membrane.

2. Physical cleaning Generally refers to hydraulic cleaning, such as mechanical scrubbing and backwashing. The main method of hydraulic cleaning is backwashing, such as water washing and air-water backwashing expansion. Because no chemicals are introduced in water washing, the water washing method is economical. Backwashing refers to the method of blowing gas or liquid from the permeate side to remove deposits on the membrane surface. External pressurization refers to backwashing with 0.1MPa compressed air or pressurized liquid. Internal suction refers to periodically sucking air or liquid from the outside of the membrane into the inside of the membrane for backwashing.