Reverse osmosis equipment is mainly used in various membrane water treatment processes. Simple equipment can be directly referred to as reverse osmosis equipment, while complex equipment is called reverse osmosis systems. During the use of the equipment, scaling weather is inevitable, which is not only difficult to clean but also affects the water production efficiency. So, what causes equipment scaling? How to solve it?

When the raw water passes through the reverse osmosis membrane, insoluble salts will remain in the name of the membrane and precipitate into solid volume. During the operation of the equipment, the pressure generated during low-pressure flushing will generate fresh water, and the water concentration on both sides will naturally increase, leading to an increase in salt concentration. Salt contains a large amount of substances that can accumulate, and over time, scaling weather will occur. Therefore, only when the insoluble salt does not exceed the saturation limit can the occurrence of scaling be effectively prevented. In terms of design, in order to better replace concentrated water, the low salt content of concentrated water can be maintained.

The insoluble salts in natural water sources mainly include calcium carbonate, barium sulfate, calcium sulfate, calcium fluoride, strontium sulfate, and silica. The design of reverse osmosis equipment should pay attention to barium sulfate and strontium sulfate. The increase in calcium sulfate concentration and the decrease in water temperature also lead to a decrease in the solubility of strontium sulfate.

In addition, due to factors such as medication, some inorganic substances with lower content in natural water will be brought into the water supply, such as phosphates, iron, aluminum, etc. The solubility product of these inorganic salts is usually low and scaling is prone to occur. Therefore, when adding flocculants, coagulants, scale inhibitors, acid-base agents, etc. to the system, the influence of these artificially introduced ion components should be considered.

Sometimes, there may even be interactions between different reagents, leading to the precipitation of insoluble substances and contaminating the membrane components. In this case, when adding many chemicals, attention should be paid to their composition, and if possible, their compatibility can be confirmed through experiments. In order to better protect the equipment and increase its service life, pre-treatment of raw water can be carried out. Large particle impurities can be filtered with activated carbon or quartz sand, and then softened with ion exchange resin to remove calcium and magnesium plasma from the water, avoiding scaling.

To prevent scaling weather, the filtration speed of the filter should not be too fast or too slow. During the backwashing process, there should be some time and flow rate. The backwashing effect is good, and the filter runs well; When the water flow is running, attention should be paid to ensuring the uniformity of the water flow. Only when the water flow is uniform can the filtering effect be good; In terms of filter media, the particle size of the filter media should consider uniformity. In short, the reasonable use of membrane treatment in reverse osmosis equipment can further prevent the occurrence of equipment scaling weather.

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