Unit is a filtration media and is generally used for the removal of iron and manganese compounds. It is an efficient and economical granular media. It can be used in pressure filters as well as in slow sand filters. Birm media increases the reaction of dissolved oxygen and iron compounds in water like a catalyst. Due to the excess of dissolved iron free carbon dioxide in groundwater, it is usually in the form of ferrous bicarbonate and cannot be filtered. Birm media converts Fe+2 to Fe+3 form together with dissolved oxygen in water as a catalyst, and the resulting ferric hydroxide can precipitate and be easily filtered. Due to the physical properties of the unit media, the precipitated compounds can be easily removed by backwashing only with water. At the same time, it provides a lot of economic advantage compared to other media as it is not dissolved in water or consumed during iron removal.
When using Birm mineral, it should be ensured that there is no oil, hydrogen sulfide, organic matter over 4 – 5 ppm in the water. In addition, the amount of dissolved oxygen in the water should be equal to at least 15% of the amount of iron, and the pH level of the water should be 6.8 or more. If the pH level is low, it should be increased by using one of the Turbidex, Corosex, Calcite minerals or caustic. If the amount of dissolved oxygen in the water is low, the required amount should be reached by aeration.
Raw water should be checked periodically. Especially if there is manganese in the raw water, if the manganese in the treated water before backwashing is higher than in the raw water, either the media has started to break down or the capacity of the media is full.
If there is no residual chlorine or hydrogen sulfide in the water, low pH or the absence of dissolved oxygen are the main reasons for the media to begin to decompose.
Chemicals that may be added to the raw water or during backwashing prevent the media from doing its job, or break the media or coat the media, thereby reducing its efficiency. Please consult our company before adding any chemicals.
The unit can also be used for manganese removal. For manganese removal, the pH level of the water should be between 8 and 9. If the water also contains iron, the pH should be in the range of 8 – 8.5. If the pH level is above 8.5, colloidal iron is formed and is almost impossible to clean.
ADVANTAGES
- It is long lasting
- It can operate in a wide temperature range
- It has a very high iron removal efficiency
- It has minimum labor cost as it does not require regeneration chemicals.
- It can only be cleaned with periodic backwashing.
APPLICATION CONDITIONS
- The alkalinity should be at least twice the sum of sulfate and chloride.
- The maximum water temperature should be 38, the pH range should be 6.8 – 9, the amount of dissolved oxygen should be at least 15% of the iron amount and at least 29% of the manganese amount.
- Bed height should be minimum 76 cm, backwash flow rate should be 10-12gpm/ft2, service flow should be 3.5 – 5 gpm/ft2. Operation at higher flow rates depends on local conditions.
- Free chlorine should not be 0.5 ppm minimum, hydrogen sulfide should not be, oil and polyphosphates should not be present in raw water.
PHYSICAL PROPERTIES
Color : Black
Density : 35 - 40 Ibs/ft3
Size : 12 x 50 mesh
Uniform Coefficient: 2.7
