Granular filter media is used to remove iron and/or manganese compounds from water.
Birm is an effective and economical way to remove soluble iron and manganese compounds. Birm filter media can be used in both pressurized and non-pressurized water supply systems.
Clack Birm has the following advantages:
- No regeneration of the filter media is required;
- High efficiency in removing iron impurities;
- Low operating costs;
- Long service life;
- Wide temperature range of treated water;
- The light weight of the material reduces backwashing water consumption.
When using Birm for deferrization, the treated water must be free of petroleum products and hydrogen sulfide, the content of organic substances must not exceed 4-5 mg/l, the content of dissolved oxygen must be at least 15% of iron content, and pH value ≤ 6.8. Chlorination of initial water significantly reduces the activity of Birm.
Properties:
| Color | Black |
| Bulk density | 0.56-0.64 kg/dm3 |
| True density | 2.0 kg/dm3 |
| Effective grain size | 0.48 mm |
| Homogeneity coefficient | 2,7 |
| Particle size, (US Mesh) | 10х40 |
| Particle size | 2.0×0.43 mm |
Operating conditions
| Temperature of treated water, max | 38 ˚С |
| Treated water pH range | 6,8-9,0 |
| Layer height | 760-915 mm |
| Free space in the filter | 50% of the layer height |
| Linear filtration speed | 8.5-12.0 m/hour |
| Linear velocity during blasting | 20-30 m/hour |
| Expansion of the layer in the course of backwashing | 20-40 % of the filter media layer height |
