To meet municipal water regulations, Felite resins are designed to address the cleanup and remediation of contaminated groundwater, including radioactive elements removal, reduction of heavy metals, etc.
Heavy metals are toxic, high dense metallic chemical elements present in low concentrations in water and wastewater. These heavy elements can enter the water by industrial wastes, consumer wastes, and acid rains. Also, acid rains can breakdown the heavy metal in soil and surface running, and precipitation helps to release them into lakes, rivers, and aquifers. The most toxic heavy metals are Lead, Cadmium, and Mercury. But there are Zink, Chromium, copper, Nickel, Selenium too. Not only the environment but also humans are badly affected by heavy metals. Some of them are damages for the never system, organs, and skin irritations.
The ion exchange process has been used to remove heavy metals for many years. Strong acid cations, weak acid cations, and special chelating resins can easily remove these toxic elements.
Natural organic matters (NOM) in natural water bodies affect the drinking water treatment processes. Dissolved organics can be measured as Total Organic Carbon (TOC), Chemical Oxygen Demand (COD), and Biological Oxygen Demand (BOD). Process fouling, biofilm formation, and bacterial regrowth can occur due to NOM. Residual NOM also causes the formation of disinfection by-products while the addition of disinfectants and some of them are harmful to the human body; Trihalomethanes, haloacetic acids.
In the recent period, the ion exchange process is an increasing technology to remove NOM. The ion exchange process can be used as a single unit or as a combined system with the coagulation process. It will be more effective because it removes the higher amount of NOM & reduces disinfection by-products.
It’s very much popular to use Macroporous polystyrene anion exchange resins for removing NOM. It helps penetrate organic anions easily and is very useful for removing organic matter.