Pre-treatment - Iron Removal Filter

pre-treatment-iron-removal-filter

Mit Water manufactures iron and manganese removal filters for pre-treatment of groundwater and surface water containing elevated dissolved iron and manganese. These contaminants cause staining, metallic taste, and foul downstream RO membranes and ion exchange resins if not removed.

Working Principle

Dissolved ferrous iron (Fe2+) and manganous manganese (Mn2+) are oxidised to their insoluble ferric (Fe3+) and manganic (Mn4+) forms through aeration or chemical oxidation (chlorine, KMnO4). The precipitated iron and manganese hydroxides are filtered out by a bed of catalytic media such as manganese greensand, Birm or pyrolusite. The media bed is periodically backwashed to remove accumulated solids.

System Features

Our iron removal filters include FRP or carbon steel pressure vessels, catalytic filtration media, support gravel, aeration or chemical oxidation system, automatic backwash valves, and a PLC control panel. Multi-media configurations combining catalytic media with anthracite and sand are available for waters with high iron loading.

Iron removal filters are critical for treating iron and manganese bearing waters:

  • Groundwater treatment for drinking water supply
  • Pre-treatment for RO and NF systems
  • Industrial process water from well water sources
  • Cooling tower make-up water treatment
  • Bottled water and beverage production water
  • Boiler feed water pre-treatment
  • Irrigation water treatment to prevent emitter clogging

Technical Parameters

Flow Rate0.5 to 100 m3/h per vessel
Inlet FeUp to 15 mg/L
Outlet FeBelow 0.3 mg/L
Filtration Velocity10 to 15 m/h
Media TypesManganese greensand, Birm, pyrolusite, catalytic carbon
Vessel MaterialFRP or epoxy-lined carbon steel
Oxidation MethodAeration, chlorine, KMnO4, or ozone
Backwash Rate30 to 45 m/h, bed expansion 30-50%