FILTRATION MEDIA : BIRM®

GENERAL DESCRIPTION

Birm is an efficient and economical method of removing dissolved iron and manganese compounds from raw water supplies. It may be either gravity fed or pressurized water treatment systems. Birm acts as an insoluble catalyst to enhance the reaction between dissolved oxygen (D.O.) and the iron compounds. The physical characteristics of Birm provide an excellent filter media which is easily cleaned by backwashing to remove the precipitant. Birm is not consumed in the iron removal operation and therefore offers a tremendous economic advantage over many other iron removal methods.

Birm is furnished in two grades, regular and fine. Regular is generally recommended for industrial, municipal, and most domestic installations. Fine is recommended on domestic installations where backwash rates are limited. Birm may also be used for manganese removal with the same dependability as iron removal.
 

Physical Properties - Regular Birm:
Color	Black
Density	47- 50 lbs./cu. ft.
Effective Size	0.61 mm
Uniformity Coefficient	1.72

 

Physical Properties - Fine Birm:
Color	Black
Density	47- 50 lbs./cu. ft.
Effective Size	0.49 mm
Uniformity Coefficient	2.14

 

Conditions For Operation:
Alkalinity should be greater than two times the combined sulfate and chloride concentration.
Dissolve Oxygen content must be equal to at least 15% of the iron (and manganese) content
pH	6.8+
Bed Depth	30 - 36 in.
Backwash Rate	Regular Birm: 10 - 20 gpm/sq. ft. Fine Birm: 8 - 10 gpm/sq. ft.
Backwash Expansion Rate	35 - 50% of bed depth
Service Flowrate	3.5 - 5 gpm/sq. ft. intermittent flow rates and/or favorable local conditions may allow higher flow rates