Birm® flter media

Technical characteristics

• Color – black
• Bulk density – 0,64–0,72 kg/dm³
• Real density- 2,0 kg/dm³
• Effective bead size – 0,48 mm
• Uniformity coefficient- 2,7
• Particles size – 0,43–2,0 mm

Operating conditions

• Bed depth – 760–900 mm
• Freeboard – min. 50% of bed depth
• Linear fitering speed- 8,5–12 m/h
• Service flow rate – 8.5…12 m/h
• Backwash rate- 25–29 m/h
• Backwash bed expansion – 20…40% of bed depth (min.)

How it works

Birm acts as a catalyst accelerating the oxidation reaction of Fe2+ to Fe3+ with oxygen dissolved in the water. As a result of the following hydrolysis, insoluble residue Fe(OH)3 is formed, which is removed from the water by filtration.

Removal of the residue filtered in the operating mode from the layer of the media is performed during backwash.