Reverse osmosis pretreatment resin regeneration operation method

The salt absorption operation of manual softened water equipment refers to the operation method of reverse osmosis pretreatment resin regeneration, as follows: After the resin absorbs a certain amount of calcium and magnesium ions, it must be regenerated. The time is about every 48 hours of operation (when the raw water is municipal tap water), it must be regenerated once. The regeneration process is to wash the resin layer with the industrial salt in the salt tank, to replace the hardness ions such as calcium and magnesium on the resin, and to discharge the regeneration waste liquid out of the tank, and the resin will restore the softening and exchange capacity (the water softener cannot be added with the addition of water softener). Iodized salt, adding calcium salt as regeneration agent, regularly adding salt to the salt tank to ensure the saturated concentration of brine), the regeneration time is recommended in the evening, after the equipment is shut down, the salt is absorbed and left for one night. Steps After cleaning, start the host.

Resin regeneration steps:

Open the salt inlet valve, close the other valves, start the raw water pump, suck all the brine in the salt tank into the softener, and leave it for more than 4 hours.

Wash salt:

After the resin is regenerated, the salt in the softener must be rinsed before use, according to the manual valve flushing method (including forward flushing and back flushing).

The presence of calcium and magnesium ions in water is the main reason for the formation of scale when the water temperature changes. At present, the softening water equipment commonly used in China mainly includes manual type, domestic combined type, domestic multi-valve type and imported multi-way valve type. Among them, the imported multi-way valve type softened water equipment is the main product on the market. With the imported multi-way valve and controller as the core, it is equipped with domestic resin tanks, salt tanks, pipes and other materials to form a fully automatic softening water equipment.

Since the deposition of scale has a significant impact on people’s life and production, both production water and domestic water have certain requirements for hardness indicators, especially if the boiler water contains hardness salts, it will be formed on the heating surface of the boiler. Scale, thereby reducing the thermal efficiency of the boiler, increasing the fuel consumption, and even damaging parts and causing explosions due to local overheating of the metal wall. Therefore, water softening treatment should be carried out for low pressure boilers; water softening and desalination treatment should be carried out for medium and high pressure boilers.

Ion exchange method:

Using a specific cation exchange resin, the calcium and magnesium ions in the water are replaced with sodium ions. Due to the high solubility of sodium salts, the formation of scale with the increase of temperature is avoided. This method is the standard method in common use today. The main advantages are: The effect is stable and accurate, and the process is mature. The softening water equipment using this method is also generally called “ion exchanger” (because most of the sodium ion exchange resins are used, so it is also called “sodium ion exchanger”).

How the ion exchange method works:

Ion exchange resin is a polymer with corresponding functional gene groups. In general, conventional sodium ion exchange resins have a large amount of sodium ions.

When the content of calcium and magnesium ions in the water is high, the ion exchange resin can release sodium ions, and the functional gene group is combined with the calcium and magnesium ions, so that the content of calcium and magnesium ions in the water decreases, and the hardness of the water decreases. Hard water becomes soft water, which is the working process of softening water equipment.

When a large number of functional gene groups on the resin are combined with calcium and magnesium ions, the softening ability of the resin decreases, and sodium chloride solution can be used to flow through the resin. At this time, the sodium ion content in the solution is high, and the functional gene groups will release calcium and magnesium ions. When combined with sodium ions, the resin regains its exchange capacity, a process called “regeneration”.

Xi’an CHIWATEC Water Treatment Technology is a high-tech enterprise specialized in various water processing devices. Aside from these individual products, which cover a number of types and series, we can also help with related comprehensive engineering projects. Thanks to our hard work and dedication upon our founding, we are now one of the fastest-developing water treatment equipment manufacturers in Western China.

Further reading:

Water softening system

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