Description
Anti-scalants
Each membrane system such as Reverse Osmosis, Naturally, due to the presence of suspended solids soluble, salt solutions, and microbial parameters in water, suffered blocking. So we are required to comply this, with suitable physical and chemical pre-treatment of the water. The first possibility of sediment formation in the raw water purification system is when the solubility of any low soluble salt is increased. The membrane-level deposition mechanism relates to a gradient of concentration, and it happens that water continuously passes through the membrane and leaves a large amount of soluble salts behind it. This happening at the surface of the separating membrane, creating a concentration that forms a boundary layer, an effect known as “concentration polarization” inside this boundary layer, salts may begin to precipitate and suspended solids They can begin to settle on the surface of the membranes and form in layers separated by membranes, sediment particles and sedimentary layers.
Natural water, if not treated, calcium carbonate will settle on the membrane surface. Calcium sulfate is another common natural water sediment. Sediment usually begins at the next steps. This sediment increases the pressure drop and therefore requires more pressure to maintain the water output of the product.
Anti-scalants are used to reduce the sediment effects that cause reverse osmosis membranes to cope with water-soluble salts.
Anti-scalant has a significant impact on the lifetime of reverse osmosis membranes and reduces the cost of replacing annual consumption filters.
Comparison of sediment inhibitor:
Most sediment inhibitors have a molecular structure with functional groups including carboxylic acid (-COOH) or phosphate. Low molecular weight polyacrylate molecules (molecular masses ranging from 100 to 5000) contain several carboxylic acid groups and are commonly used in many inhibitors. These inhibitors are among the best in preventing the formation of sulfate and carbonate, but their dispersal properties are limited. Hexamethasone sodium (SHMP) is one of the substances that is chosen as inhibitor, because in addition to good deterrence, it is also cheap. One of the disadvantages of this article is instability and also its difficult dissolution in water. In fact, if SHMP is not reoccupied every three days, hexamethaphosphate is hydrolyzed to phosphate, which in neutral Ph mixed with calcium and forms phosphate. This salt can cause blocking the membrane of the system. The use of hexamethaphosphate as a sediment inhibitor for R.O systems has not been universally accepted due to its high dependence on consumption.
Organophosphonates are more stable in comparison to sodium hexamethaphosphate. Inhibitory and dispersion properties of this substance are similar to sodium hexamethaphosphate. But unlike sodium hexamethaphosphate, this substance is stable.
Polyacrylic with a heavy molecular mass (molecular weight between 6,000 and 25,000) has the best effect on dispersion, but is not as effective as light-weight acrylics in sediment deterioration.
As previously stated, the use of combined inhibitors have better results than monoclonal inhibitors. If a single molecule inhibitor is used, it is more likely that excessive inhibition of the inhibitor causes the self-inhibitor to release a multi-capacity cation. By combining products with the use of multi-molecular inhibitors, other inhibitors can be effective in preventing the deposition of the first inhibitor. Also, a lower concentration of each component of the inhibitor will be required.
Some types of combinational inhibitors, including polyacrylic with molecular weight of lightweight, have enough power to inhibit and disperse. In addition, other inhibitors are a combination of lighter molecular weight acrylate organophosphates that have good dispersion, and inhibitory properties.
Sometimes, biological activity in Sediment Inhibitor Tank can cause problems. Biological growth can cause blockage of the injection path of the pump and stop the inhibitory flow. Usually the containment or suspending agents contain some bioside materials. However, when diluting these solutions in daily tanks, care should be taken to ensure that the concentrations of these biomass materials in the dilute solution do not drop out of the least effective amount. . This value is usually set by the manufacturer. Due to the fact that the containment agents slow down (not stop) the precipitation process, so the system should not remain out of service for a long time in over-saturated state of salts. Usually, an automatic electrical valve is installed in parallel with the exhaust stream to open the system right before and after the service, and all the elements are discharged from the super saturated salts.
In some cases, a tank is used to inject two or more chemicals at different times. In this case, care must be taken to avoid mixing the materials together to prevent damage to their performance and system.
Instructions on the use of formulated Abrizan Company anti-scales
NO | Code | Usage | How to use |
1 | APH1030 | Vessel anti-scale with neutral Ph Use for waters under 900ppm Acid-damaged vessels vessels with relatively free pores | Injection dose: Water hardness 700-900ppm……. 6ppm Water hardness 500-700ppm…. …5ppm Water hardness 300-500ppm……. 4ppm Water hardness 100-300ppm……. 3ppm Dissolve 500cc pure solution in 20 liters of water without hardness and then inject. |
2 | APH0133 | Vessel anti-scale for hard water with low pH Use for waters of + 1000ppm to 4000ppm vessels that are almost cape and have closed pores | Injection dose: Water hardness 2000-4000ppm….. +6ppm Each 1000cc pure solution is dissolved in 20 liters of pure water and then dosed. Water hardness 1500-2000ppm….. +5ppm Water hardness 1000-1500ppm……+4ppm Each 600cc pure solution is dissolved in 20 liters of water hardly and then injected. |
3 | APH0132 | Vessel anti-scale with low Ph Use for waters of -900ppm | Injection dose: Water hardness 700-900ppm …..…..6ppm Water hardness 500-700ppm ……….5ppm Water hardness 300-500ppm ……….4ppm Water hardness 100-300ppm ……….3ppm Each 500cc pure solution is dissolved in 20 liters of water without hardness and then injected. |
4 | APH0138 | For salty water with a low pH | Analyzing of Sea water, any kind of wells saltwater, and surface water are essential for better performance. (Infusion range between 5-8 ppm) |
5 | APH00135 | Vessel anti-scale with low Ph Vessel anti-scale and anti-Environmental pollutants Suitable for systems that have microbial contamination | Injection dose for R.O. devices and vessels that have accumulated microorganisms are important, therefore, microbial tests are necessary for better performance and more accurate dosage. Water hardness 1500-2000ppm…… 6ppm Water hardness 1000-1500ppm…… 5ppm Water hardness 650-1000ppm ……..4ppm Water hardness 200-650ppm ……….3ppm Each 500cc pure solution is dissolved in 20 liters of water without hardness and then injected. |
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