The earth is covered by 70% of surface water, but freshwater resources are still rare. Water conservation is very important. First of all, we must pay attention to industrial water that consumes a large amount of water.

In industrial water, cooling water accounts for about 60% – 70%, which is the largest part. Therefore, saving cooling water is a top priority for industrial water conservation. The emergence of HEDP phosphonate and other water treatment chemicals has provided powerful support for saving cooling water.

Recycling the cooling water greatly saves water consumption.

However, as the cooling water continuously evaporates, the concentration of salt in the water increases. At the same time, the contact of cooling water with the atmosphere, the dissolved oxygen, and bacteria content increased significantly. This leads to fouling and corrosion of circulating cooling water equipment.

Bacteria and algae grow massively in the pipeline. For those reasons, the heat transfer rate of the cooling water is greatly reduced. The frequent maintenance of cooling water equipment has affected the normal production process.

For this purpose, a water treatment agent such as HEDP phosphate must be added to the cooling water.

This chemical technique, called chemical water treatment, is a chemical technique that prevents scaling and corrosion of circulating water. It includes pre-treatment, cleaning, pickling, pre-coating, conventional addition, sterilization, and other processes.

Coagulants and flocculants are also important means for primary treatment of wastewater. Coagulants and flocculants are also important means for primary treatment of wastewater. Chemical water treatment technology is currently recognized as the most widely used and most effective means of industrial water conservation at home and abroad.

Scale and corrosion have a significant negative effect on cooling water equipment. HEDP can reduce fouling well. HEDP phosphonate provides good protection for cooling water equipment. Phosphate is an anodic corrosion inhibitor.

In the neutral and alkaline environment, the corrosion inhibition of phosphate on carbon steel depends mainly on dissolved oxygen the in water.

The reaction of dissolved oxygen with steel produces a thin layer of a γ-Fe₂O₃ oxide film. The growth of this oxide film takes a long time to complete. During this period, electrochemical corrosion continued to occur at the gap of the oxide film. These gaps can be blocked by continuously growing iron oxide. These gaps can be blocked by continuously growing iron oxide and insoluble iron phosphate to protect the carbon steel.

Since the HEDP phosphate reacts with calcium ions in water, the resulting calcium phosphate-prone scale has little solubility in water. Therefore, HEDP was rarely used as a cooling water inhibitor in the past.

In recent years, HEDP phosphonates have been used as cooling water corrosion inhibitors due to the development of series copolymers such as acrylic acid and hydroxypropyl acrylate. However, IRO recommends that HEDP is used together with the copolymer.

If you have any requirements for HEDP and other water treatment chemicals, you can send email to us.

HEDP phosphate is the main corrosion inhibitor in the water treatment industry. Phosphonic acid groups, such as organic phosphates. They are usually ATMP, EDTMPS, HEDP, DTPMPA, PAPE, and PBTCA. HEDP phosphate has good scale resistance to calcium carbonate and zinc scale.

These organic phosphates have corrosion resistance ability. They have a good synergistic effect with other polymers and zinc salts. In particular, the latter three has a high tolerance to calcium ions and is suitable for high concentration of time. HEDP phosphate has a certain chelating capacity in addition to corrosion inhibition.

The process by which the central ions are combined with two or more coordination atoms with the same multi-tooth ligands is called chelation. The result of chelation is cationic cation (Ca²⁺, Mg²⁺) and chelating agent interacts to produce stable chelate.

This prevents them from reacting with scale anions (such as CO₃^2-, SO^42-, PO₄^3- and SiO₃^2-). That greatly reduces the probability of scaling. Chelation is carried out stoichiometrically. For example, an EDTA molecule chelates a divalent metal ion.

The chelating ability of the chelating agent can be expressed as a calcium chelating value. In general, the chelating ability of the water treatment agent is as follows (The following reagents have a 50% mass fraction of the active ingredient and a chelating capacity calculated as CaCO3): DTPMP-450mg/g, EDTA-150mg/g, HEDP-450mg/g.

In other words, one milligram of chelating agent can only chelate less than 0.5 mg of CaCO3. If it is necessary to stabilize the calcium and magnesium ions with SMM 0FL in the circulating water system, the dosage of chelating agent is 1000 m/L.

Such a large amount of consumption will increase the cost of the enterprise. However, in medium and low hardness water, the chelation of HEDP phosphate still plays an important role.

Because of these organic phosphate sharks, such as HEDP phosphate. HEDP phosphate can also be used as a metal cleaning agent. It should be noted that after the cleaning agent is used, the waste liquid after cleaning also needs to be treated with technology. Take the water system cleaner as an example.

The water quality does not meet the discharge standard because the waste liquid contains grease dirt, mud, carbon deposit, metal chip, and polar oxide. General processing technology can be used for reference to the emulsion wastewater treatment method.

1. Physical precipitation method, precipitation method, filtration method to remove suspended matter, floating oil and sediment.
2. Remove the emulsified oil, salt analysis, condensation, air flotation, and electroly, is, and realize the separation of oil.
3. Sewage purification, BI; Chemical method, ozone method and sand filter activated carbon adsorption method can be used.

The wastewater treated in three paragraphs can meet the national effluent discharge standard.