Each membrane system, such as RO system, is naturally affected by the presence of suspended solids, soluble salts and microbial parameters in the drinking water, which requires us to observe the correct physical and chemical pretreatment of the system.
Sediment and clogging can reduce the effective space between the materials and reduce the turbulence of the flow, which results in an increase in polarization of the concentration at the membrane surface. The higher the concentration of the solution on the surface of the membrane, the more it passes more solutes than it does. When the effective surface of the membrane decreases, the turbulence will be reduced, and cleaning the membrane surface becomes more difficult because the possibility of sending the chemical solution to the blocked surfaces (by solids) decreases; thus preventing the formation of the deposit using the correct system efficiency and Injection of chemicals is a prerequisite for RO systems.
The inhibitor prevents the growth of crystalline salt by preventing the growth of the sedimentation process. These materials are absorbed at the crystalline salt surface and, by preventing the absorption of excess saturated salts at crystalline surfaces, reduce the speed of crystalline salt crystallization, and thus the primary crystalline nuclei never reach a required amount or concentration for precipitation.
Most sediment inhibitors have a molecular structure with functional groups including carboxylic acid (-COOH) or phosphate. polyacrylate molecules with Low molecular weight (molecular weight ranging from 5000 to 100) include 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; therefore, the use of combined inhibitors results in better results than single molecular 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.
With a long history in the field of anti-scalant production, Abrizan Co. In order to improve the performance of these R.O. devices, and increase the useful life of membranes, has been developing a new generation of polymer-based composite anti-scalant.
Advantages of Polymer Anti-Scalant:
- Concentration is high.
- It prevents deposition of all carbonate or phosphate deposit.
- For a wide range of waters such as seawater, shale water, soft hard water, water with a hardness below 1000ppm, formulated and used.
- It has better performance due to its high chelating agent.
- With very low corrosion rate (anticorrosive).
- It is non-toxic and does not have skin and respiratory problems for humans.
- Good dispersant function against carbonate and sulfate deposits.
- The need to wash the membrane over a longer period of time.
- Reduces the likelihood of the formation of algae and bio-contaminants.
The amount of injection of anti-scalant types depends on parameters such as water analysis, discharge rate, temperature, pH, system recovery, water source, membrane type, and membrane arrangement. Typically, the amount of injections of anti-scalants is in the range of 2-8ppm.
|Dose||Usage||Polymeric anti-scalant Code||No.|
|3-8ppm||Salty Water +1000ppm||APA61||3|
|2-6ppm||Hard Waters -1000ppm||APA56||4|
The amount of anti-scalant used for one day should be diluted in accordance with the instructions of the technical offices in containers of 20 to 1000 liters with R.O. water and injected by a dosing pump.