Chemical water treatment is a chemical technique that uses chemicals to eliminate and prevent scaling, reduce corrosion, kill bacteria and algae, and purify water. In the water treatment industry, chemicals are generally used to perform these tasks. Using flocculants to remove mechanical impurities in raw water. Using scale inhibitors to prevent scaling. Using fungicides to stop the growth of harmful microorganisms. Cleaning agent removes rust residue, old scale, and oil stains.
There are three main types of water treatment chemicals: flocculants, biocides, and scale inhibitors. The flocculants are to settle the suspended matter in the water and reduce the turbidity of the water. An inorganic salt flocculant is usually added to a small amount of an organic high-molecular flocculant to dissolve it in water. They are mixed with the treated water, allowing the suspended matter to settle in large quantities.
The biocide is to control or remove bacteria and algae from the water. Scale inhibitors are mainly used for circulating cooling water. It can increase the concentration of water and reduce the amount of sewage to achieve the purpose of saving water. At the same time, scale inhibitors can also reduce the fouling and corrosion of heat exchangers and pipes.
HEDP is a kind of scale inhibitor. It can prevent scale and dirt. Compared to other scale inhibitors, HEDP has many advantages. Such as excellent dirt resistance, low pollution or harmless, low dose, good dissolution, good synergy. HEDP phosphonates provide the conditions for the application of alkaline water treatment technology. Scale inhibitors commonly used in industry are mainly organic phosphonate scale inhibitors, such as HEDP and DTPMP. Phosphorus-based formulations are used in circulating water systems, mainly organic phosphonates.
Organic phosphonic acid is a compound that is directly linked to the carbon source in the phosphonic acid group. The most commonly used organic phosphonic acids are ATMP and HEDP. Organic phosphonic acids and their salts are similar in many respects to polyphosphonates. They all have a low scale effect and have a corrosion-inhibiting effect on the steel.
However, the organic phosphonic acids and their salts are not as easily hydrolyzed to the phosphonates as polyphosphonates. This is their outstanding advantage. Organic phosphonic acids and their salts have been successfully used to control corrosion and scaling of high hardness, high temperature, and high pH cooling water systems. Therefore, organic phosphonic acids are often used as scale inhibitors.
Organic phosphonic acids and their salts have the following advantages.
- It is not easily hydrolyzed and is especially suitable for cooling water systems with high hardness, high pH, and high temperature.
- Its zinc salt is stable in water.
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