Features
- No chemicals need for maintenance when used
under proper conditions. Regeneration is not required.
- Iron removal efficiency is extremely high.
- Negligible labor cost: only periodic backwashing is
required.
- Durable material with a long life and a wide temperature
range.
|
Regular Birm
|
Color |
Black |
|
Density |
47 to 50 lbs per ft3 |
|
Effective Size |
0.61mm |
| |
Uniform Coefficient |
1.72 |
Physical Properties
| Sieve No. |
+9 |
9-14 |
14-20 |
20-28 |
28-35 |
35-48 |
48-100 |
| Percent |
0.5 |
30.3 |
34.7 |
26.5 |
6.8 |
0.4 |
- |
| Percent |
0.5 |
30.8 |
65.5 |
92.0 |
98.8 |
99.2 |
- |
| Retained |
|
|
|
|
|
|
|
Fine Mesh Birm
|
Color |
Black |
|
Density |
47 to 50 lbs per ft3 |
|
Effective Size |
0.49mm |
| |
Uniform Coefficient |
2.14 |
| Sieve No. |
+9 |
9-14 |
14-20 |
20-28 |
28-35 |
35-48 |
48-100 |
| Percent |
0.5 |
0.7 |
2.3 |
12.5 |
35.0 |
32.5 |
11.5 |
| Percent |
0.5 |
1.2 |
3.5 |
16.0 |
51.0 |
83.5 |
95.0 |
| Retained |
|
|
|
|
|
|
|
|
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 to 5 gpm per ft² |
| Alkalinity |
Greater than two time the combined sulfate and chloride
rate |
| pH |
6.8 or higher |
| Dissolved Oxygen |
Equal to at least 15% of the iron (or iron and manganese)
content 30 to 36 inches |
| Bed Depth |
30 to 36 inches |
| Backwash Rate |
|
| Regular
Birm |
10 to 12 gpm per ft² |
| Fine Mesh
Birm |
8 to 10 gpm per ft² |
| Freeboard |
35% to 50% |
Packaging
Woven polypropylene bag. Each bag contains 1 ft³
(50 lbs net weight).
Birm® is a registered trademark Clack
Corporation. |
