Manganese Greensand Filters

Manganese Greensand filters are utilized for the removal of soluble iron, manganese, and hydrogen sulfide. Potassium permanganate and/or chlorine is fed directly into the raw water ahead of the Greensand filter. When feeding both, the chlorine should be fed upstream of the potassium by 10 to 20 seconds. A chlorine residual should be measured at the filter outlet. Potassium permanganate should be fed to produce a just pink color at the filter inlet. This slight excess of potassium or a chlorine residual carried through the filter will maintain the greensand in a continuously regenerated state. Greensand will remove ferrous iron if less than 10 ppm and the pH of the water is 6.2 to 8.8. Greensand may be used for the treatment of manganese if the pH of the water is above 8.0 and the manganese is less than 10 ppm. Hydrogen sulfide may also be removed if it is less than 5 ppm and the pH of the water is 6.2 to 8.8. The manganese greensand CR operation has been successful in removing radium and arsenic from well water supplies. The iron and/or manganese precipitates that are formed adsorb the radium and arsenic. Pilot testing is recommended for Radium or Arsenic removal applications. Ecodyne Industrial offers a complete line of continuous regeneration (CR) Greensand filters starting at 12 (8 gpm) up to 72 (560 gpm). These filters are offered in a single multiport valve design or valve nest design.