Filtration Media
SWT logo Birm®

Birm® is an efficient and economical method of removing dissolved iron and manganese compounds from raw water supplies. It may be used in either gravity feed or pressurized water treatment systems. Birm acts as an insoluble catalyst to enhance the reaction between dissolved oxygen and the iron compounds. In ground waters, the dissolved iron is usually in the ferrous bicarbonate state due to the excess of free carbon dioxide and is not filterable. Birm, acting as a catalyst between the oxygen and the soluble iron compounds, enhances the oxidation rate of Fe++ to Fe+++ and produces ferric hydroxide which precipitates and may be easily filtered.

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.


Suggested Operating Conditions
Service FLow Rate 3.5 - 5 gpm/ft²
Alkalinity Greater than two times
the combined sulfate
and chloride rate
pH 6.8 or higher
Dissolved Oxygen Equal to at least 15%
of the iron (or iron &
manganese) content
Bed Depth 30 - 36 inches
Backwash Rate 10 - 12 gpm/ft²
Freeboard 35% - 50%
X  
Physical Properties
Color Black
Density 47 - 50 lbs/ft³
Effective Size 0.48 mm
Uniform Coefficient 1.72
X  
US Standard Mesh Size
US Mesh % % Retained
+9 0.5 0.5
9 - 14 30.3 30.8
14 - 20 34.7 65.5
20 - 28 26.5 92.0
28 - 35 6.8 98.8
35 - 48 0.4 99.2
48 - 100 — —



Features:

  • No chemicals needed for maintenance when used under proper conditions. Regeneration is not required.
  • Iron removal efficiency is extrememly high.
  • Negligible labor cost—only periodic backwashing is required.
  • Durable material with a long life and a wide temperature range.

Packaging
Woven polypropylene bag. Each bag contains 1 Cu. Ft.
(50 lbs net weight)


This information has been gathered from standard materials and or test data that is believed to be accurate and reliable. Nothing herein shall be determined to be a warranty or representation expressed or implied with respect to the use of such information or the use of the goods described for any particular purpose alone or in combination with other goods or processes, or that their use does not conflict with existing patent rights. No license is granted to practice any patented invention. It is solely for your consideration, investigation and verification.
 
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Safe Water Technologies, Inc.
996 Bluff City Boulevard
Elgin, IL 60120 USA
  
 
Telephone: +1.847.888.6900
Facsimile: +1.847.888.6924
E-mail: info@swtwater.com
http://www.swtwater.com

Last Updated: March 5, 2008