Which post treatment methods are used in commercial RO Plants?
If water from RO facilities is not treated properly, corrosion may occur in pipes and fixtures farther down the line, including the distribution system. The post-treatment procedure includes the addition of chemicals to modify the quality of the water.
Post-treatment may be required depending on how the product water will be used at the point of use; for instance, RO permeate must be re-mineralized before being distributed for potable consumption. RO product water is polished to further de-mineralize it, for applications that call for high-purity or ultrapure water.
Let’s see which post-treatme?nt methods are used in commercial RO Plants!
· pH Adjustment
By changing the pH, insoluble chemicals are produced on exposed pipe walls. Passivation serves as the operational mechanism for this corrosion management strategy.
The pH level is altered using chemicals like lime, soda ash, sodium hydroxide, potassium hydroxide, and carbon dioxide. The optimum source waters for pH adjustment include, low to moderate hardness and alkalinity between 80 and 150 mg/L as CaCO3.
· Alkalinity Adjustment
Alkalinity adjustments are frequently used to produce insoluble compounds, on the pipe walls of distribution systems. By including pipe components in a metal hydroxide/carbonate protective layer, carbonate passivation is accomplished.
By adjusting the alkalinity, the amount of dissolved inorganic carbonate (DIC) in the source water, is modified. Alkalinity can be changed with the help of lime, soda ash, sodium bicarbonate, sodium hydroxide, potassium hydroxide, and carbon dioxide. The use of sodium bicarbonate is preferred for alkalinity correction.
· Calcium Adjustment
This method works by altering the equilibrium of the calcium carbonate system, for the source water. The purpose of this treatment method is to coat the pipe walls in a protective layer of calcium carbonate. Calcium carbonate precipitation is accomplished by modifying the pH and alkalinity of the source water, and neither calcium addition nor removal is necessary. The key to this treatment strategy is creating the ideal conditions for calcium carbonate saturation to take place.
· Odour Control
Due to the fact that H2S is gas, it cannot be removed by membrane methods from groundwater. It may be essential to do a post-treatment with a single or two-stage odour control system, in order to get rid of H2S and other produced gases like CO2 (if excessive pre-treatment acids are added).
· Corrosion Inhibitors
Polyphosphates, zinc phosphates, and silicates are the three main types of inhibitors that are frequently utilized.
The inhibitors prevent corrosion through a number of different ways, such as buffering the water at the proper pH, securing the corrosion by-products, particularly lead and copper, inhibiting scale growth, and developing a coating film on the pipe walls.
· Adding of Blenders
In order to stabilize the product water and lessen the effects of the aforementioned problems, pre-treated source water may be added to or blended with the (permeate) product water. The pre-treated water must be disinfected before or after blending, though, due to the introduction of blending.
Sadly, blending won't entirely stabilize the product water, thus permeate still needs to have some calcium and alkalinity. The use of lime or limestone treatment can be used to achieve this.
Conclusion
The efficiency of reverse osmosis technology has increased dramatically during the past 50 years. This is made possible by innovative design, improved membrane materials, more effective pumps, increased pre-treatment techniques, post-treatment techniques and antiscalant chemicals.
How can we assist?
Look for High-quality Commercial RO Plants from renowned manufacturers, like Netsol Water Solutions. We have found successful and efficient methods for the post-treatment in RO Plants. We are one of the most affordable businesses dedicated to protecting water resources.
The company offers a wide range of water treatment alternatives, including Water Softeners, Industrial RO Systems, and much more. To discuss your needs, contact us at 9650608473, or send an email to enquiry@netsolwater.com with your inquiry.