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Anti Scalant

Anti Scalant

Antiscalant or antiscalant is one of the most widely used materials in the water treatment industry that prevents the formation of sediment on the membranes of industrial desalination devices to a great extent. Some of these materials have a phosphate base, and some of them have a polymer base, and not choosing the right type and quality of them leads to a decrease in the lifespan of the membranes and the efficiency of water purification devices. safe comfort; The provider of water and wastewater treatment chemicals continues to introduce different types of antiscalants and the advantages and disadvantages of using low-quality antiscalants, chemical formula, as well as the formula and how to calculate the amount of acid and alkaline antiscalant injection, price and important items in the purchase. and will describe their sales.

What is antiscalant?

One of the biggest problems in water purification as well as seawater desalination is the presence of a large amount of salts and salts that accumulate and deposit on the purification equipment over time. Strontium sulfate (SrSO₄), barium sulfate (BaSO₄), calcium carbonate (CaCO₃) and calcium sulfate (CaSO₄) as well as silica deposits (SiO₂) are among the compounds that cause deposits in reverse osmosis membranes. Excessive deposition and accumulation of these compounds on the membranes leads to a phenomenon called scaling, which causes serious damage to the engine and other equipment of the desalination device. For this reason, it is necessary to prevent sedimentation on these surfaces as much as possible in different ways.

The use of anti-scalant or anti-sediment materials, which are also known as anti-sediment, is one of the suitable solutions for this purpose, which has a great effect on reducing the sediment on the membrane. These materials, which have a phosphate and polymer base, prevent the reduction of the efficiency of TDS reducing devices and prevent the damage and tearing of the membranes.

Types of anti-scalant or anti-fouling

Antifouling materials can be divided into different groups based on their chemical composition and formula. Among these cases, two general groups can be mentioned, the first type has a phosphate base and the other group consists of polymer materials. In the phosphate type, these carboxylic and phosphate materials exist and have a very high power in reducing the sedimentation of water purification equipment. In another type, these materials, which have a polymer base, are able to prevent carbonate and sulfate deposits and are a practical option for use in the desalination process of sea water.

In addition to being phosphate or polymer antifouling materials, they can also be divided into different groups based on the pH value, which are:

Acid antiscalant

One of the most important features of this group is their pH less than three, which makes them very effective in removing calcium carbonate deposits. For example, anti-sediment RO 120, which has an amber color, is among the anti-sediment materials that are placed in this group and prevent the formation of calcium phosphate and iron and calcium carbonate deposits well.

Alkaline antiscalant

Anti-precipitation materials that have alkaline properties are among the practical options to prevent the deposition of various metals, such as aluminum and manganese, as well as iron. These materials have a phosphate base, and Genesis alkaline antiscalant is one of the most widely used examples in this group.

Neutral antiscalant

Another group of antifouling materials, whose pH is between 5 and 6, acts neutrally and can be used with different membranes.

Antiscalant or antifouling chemical formula

A very important point in the chemical formulation of anti-scalants or the formula of anti-sediment compounds is that these materials are completely different based on the pH level and the type of sediments in the water. For example, carboxylic acid, polyphosphate, polyacrylic acid, and anionic polymers are used in the chemical formula of antiscalants that have a polymer base. In another type of these materials, a combination of polydisodium propanephosphonates can be seen, which Butler’s cyclopolymerization is used in their manufacturing process.

Application of antiscalant in water purification

As mentioned many times throughout the text, these materials strongly resist the formation of deposits on the membranes of industrial desalination and reverse osmosis devices. Formation of sediment on the membranes reduces their efficiency to a great extent and lowers the efficiency of the device in reducing water hardness. Anti-fouling materials are used for this purpose. The function of these materials is to prevent the formation of sediment on the membrane, causing a delay in the process of sediment formation. In industrial desalination systems, various equipments are used, including sand filters and carbon filters, each of which is effective in removing salts and pollutants in water. Finally, micron filters are used, which have a high impact on the quality of the output water.


Antiscalants are used in water purification before micron filters and after sand filter and carbon filter, and by delaying the sediment formation process, they remove the solutes from the RO device along with the effluents.




Reverse osmosis antiscalant

One of the main uses of these materials is reverse osmosis. Reverse osmosis antiscalant is injected into the system along with a small amount of acidic substances and prevents the formation of deposits on the membranes. Injected acidic substances prevent the formation of calcium carbonate and calcium phosphate deposits and adjust the value of the LSI index in the range of one to two.


Effects of anti-scalant or anti-fouling of membranes

As much as antiscalant can help increase the life of the reverse osmosis device, choosing the wrong type and using it incorrectly can damage this equipment. As it is possible to point out the side effects of inappropriate antiscalants, creating an acidic environment in water and corrosion in equipment. In addition, not injecting it in the right amount causes a lot of sediment to form on the membranes. Sedimentation of the pores of the membranes over time puts a lot of pressure on the machine’s engine and also increases the energy consumption to a great extent. In addition, over time, the water output from the device will decrease.


Calculate the amount of antiscalant injection

Due to the complications of not injecting antifouling substances in the correct amount in the filter, it is necessary to calculate the exact amount with the help of the formula. Various factors play a role in the calculation formula of antiscalant injection, the most important of which is the type of these materials. In addition, the amount of PH, temperature, amount of TDS, and the flow rate of the incoming water all play a role in this formula, and finally, the exact dosage amount is measured with the help of special software, including Corola.t.


How to inject antiscalant

Considering that these anti-fouling materials are used to prevent various deposits on the membranes, for this reason they are injected between the cartridge filter and the pressure pump. After determining the appropriate place to inject these substances, the exact amount of the dose required according to the existing conditions in terms of the amount of water and pH, etc., the antiscalants enter the fluid. Dosing pumps are used for injection, and according to their type, all measurement and injection steps can be done automatically or with the intervention of a human operator.




Anti-scalant test

In the process of antiscalant production, many tests are performed to prepare the product with the best quality, purity and efficiency. In general, anti-scalant tests that are performed in laboratory environments based on NACE and ASTM standards, measure the efficiency and effectiveness of these materials. In addition, the inhibition percentage of the material from the formation of calcium sulfate and calcium carbonate deposits, etc., is also qualitatively and quantitatively measured in this test and is assigned to the quality grade product.




Choosing the best antiscalant

Anti-scalant brand in Iran and foreign countries offer different features for their products. For this reason, there are differences in quality as well as density and PH etc. in them. In choosing antiscalant with the best quality and features, it is necessary to pay attention to the following:


Antiscalant density

One of the most important things in choosing these materials is paying attention to their density. The antiscalants available in the market have densities of 2 to 8 grams per cubic meter, and the appropriate type can be selected based on the desired fluid type.


Antiscalant Ph

As mentioned, these antifouling materials have different acidic, alkaline and neutral types and they differ in terms of performance. According to the desired fluid and the type of solutes and ions and compounds in them, the ideal pH for antiscalant should be chosen.


Antiscalant applications

Due to the great power of these materials in preventing deposits in equipment and devices, there are many applications for them. Among the applications of antiscalant, the following options can be mentioned:


Preventing sediment formation in nanofiltration and ultrafiltration
Preventing the production of sediment in the industrial desalination or RO device
Removal of compounds prone to sediment formation in cooling and heating systems and boilers
Preventing the formation of deposits in the facilities of refineries and petrochemical industries

Benefits of antiscalant injection

The main reason for the high use of these materials is its many advantages and positive points, which include:

Cost savings due to the high power in removing precipitating substances and low dose injection
Preventing the formation of sediment layers on the surface of membranes and industrial equipment
Increasing the lifespan of the membranes and reducing the costs required to replace the filters
Compatibility with the environment and non-production of dangerous and harmful compounds


Despite all the above advantages, there are also disadvantages d

There is the use of these materials, the most important of which is high energy consumption due to the pressure on the pumps. In addition, the flow rate of the water coming out of the purification devices is also reduced and the hardness of the water also increases. These disadvantages occur in situations where the selected antiscalant is not at an ideal level in terms of quality and the amount of injected dose is not calculated and determined correctly.




The price of anti-scalant

The price of antiscalant is determined based on the manufacturer’s brand and whether its materials are imported or domestic, their type and composition, ph value and quality. Considering the high variety of anti-fouling materials and also the fluctuations in the exchange rate, we suggest that you contact the sales experts of Asaysafza Ayman to inquire about anti-scalant prices.




Buy anti-scalant

The type of anti-sediment material that is used in the water purification and desalination process will be different based on the type and amount of solutes in the water and environmental conditions and temperature. In addition, the use of the wrong type and low-quality anti-scalants can cause serious damage to the device, for this reason, the experts of Asaish Afza Ayman Group provide free advice and suggest suitable options before buying anti-scalant.




Selling anti-scalant

The sale of anti-scalant in Tehran, Mashhad, Isfahan, Shiraz and other cities of Iran with quality assurance is considered to be a safe and secure service. The sales experts of this collection will provide advice for choosing anti-scalant before purchase and will provide you with all you need to know about the manufacturer, performance, brand, and features of these materials.

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Asayesh Afza Imen Company started its activity in the 70s with the aim of providing engineering consulting services in the construction and operation of water and wastewater treatment systems. This group operates by taking possession of the world’s technical knowledge and relying on new engineering technologies in the field of design, construction, installation and commissioning of water (industrial, domestic, swimming pool) and sewage systems.

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