1. What is softened water treatment?
Using a strong acid cation resin to replace calcium and magnesium ions in the raw water, the boiler inlet water filtered by the water softening equipment becomes the softened clean water for the boiler with extremely low hardness.
2. Working principle of water softening equipment
Dior water treatment factory engineers often conduct softened water treatment according to the following principles:
1. Ion exchange method
Method: Use a specific cation exchange resin to replace the calcium and magnesium ions in the water with sodium ions. Due to the high solubility of the sodium salt, the formation of scale caused by the increase in temperature is avoided.
Features and effects: The effect is stable and accurate, and the technology is mature. The hardness can be reduced to 0.
Application range: catering, food, chemical, pharmaceutical and other fields, air conditioning, industrial circulating water and other applications. The most commonly used standard method at present.
2. Electromagnetic method
Method: Add a certain electric or magnetic field to the water to change the characteristics of the ions, thereby changing the deposition rate of calcium carbonate (magnesium carbonate) and the physical characteristics of the deposition to prevent the formation of hard scale.
Features and effects: small equipment investment, easy installation, low operating costs. The effect is not stable enough, and there is no unified measurement standard, and since the main function is only to affect the physical properties of the scale within a certain range, the use time and distance of the treated water have certain limitations.
Scope of application: It is mostly used for the treatment of commercial circulating cooling water (such as central air-conditioning, etc.), and cannot be used for industrial production and boiler make-up water treatment.
3. Membrane separation method
Method: Both nanofiltration membrane (NF) and reverse osmosis membrane (RO) can intercept calcium and magnesium ions in water, thereby radically reducing the hardness of water.
can only reduce the hardness to a certain range.
Characteristic effect: The effect is obvious and stable, and the water after treatment has a wide application range. There are high requirements for the inlet water pressure, and the equipment investment and operating costs are high.
Scope of application: Generally, it is rarely used for special softening treatment.
4. Lime method
Method: Add lime to the water.
Characteristic effect: It can only reduce the hardness to a certain range.
Applicable range: Applicable range of high-hard water with large flow rate.
5. Dosing method
Method: Adding a special scale inhibitor to the water can change the combination of calcium and magnesium ions and carbonate ions, so that scale can not be precipitated and deposited.
Features and effects: less one-time investment and wide adaptability. When the water volume is soft and large, the operating cost is biased.
Scope of application: Due to the addition of chemical substances, the application of water is greatly restricted. Under normal circumstances, it cannot be used in drinking, food processing, industrial production, etc. It is also rarely applied in the civilian field.