Birm Iron & Manganese Removal Filtration Media 1 ft3 (CuFt)
£47.00 excl. VAT
Birm is a relatively inexpensive material which can be used for iron and manganese removal by oxidation. It requires a pH of 7 or more for Iron removal and pH 8 for manganese removal (it uses dissolved oxygen in the water to oxidise the metal). As it acts a catalyst it is not consumed so Birm doesnt require regenerating or topping up. Birm also has the advantage of acting as a filter, removing turbidity. If the pH of the water is too low pH correction may be required. Media life expectancy is 2 to 3 years.
Birm is a black granular filter material used for removal of iron and/or manganese from water in pressure or gravity systems. It contains an active insoluble catalyst to precipitate iron and/or manganese. Because the presence of iron is most common, iron removal is the usual application for Birm. Under suitable conditions, the iron and dissolved oxygen in water react on contact with the Birm filter bed and, as a result, the iron is precipitated in the form of hydroxide. This is a flocculent material which is filtered out in the bed of Birm. Periodic backwashing flushes out the accumulated iron and the Birm is again ready to perform its function. Birm is not consumed in the iron removal operation.
€¢ No chemicals to purchase for maintenance. Regeneration not required.
€¢ Iron removal efficiency is extremely high.
€¢ Negligible labor cost. Only periodic backwashing required.
€¢ Durable material with a long life.
€¢ Wide temperature range application.
Conditions necessary for the use of Birm
€¢ No hydrogen sulphide present.
€¢ Organic matter not to exceed 4-5 ppm as indicated by the oxygen consumed value.
€¢ Oil must not be present.
€¢ A dissolved oxygen content of at least 15% of the iron. (Example Iron = 10ppm.
Dissolved Oxygen = 1.5 ppm or more).
€¢ A pH of 6.5 or higher.
Note: The correction of waters having a pH of less than 6.5 can be accomplished by several methods. Aeration, the use of Corosex “F” (CLACK neutralizing method), or the addition of chemicals, such as soda are examples of common methods frequently used. A combination of the above methods is often used, depending on the amount of correction desired. The dissolved oxygen content of a water supply is raised by proper separation.
The removal of manganese from water by the catalytic action of Birm usually requires a higher pH than is required for iron removal. Such water should have a pH in the range of 8.0- 9.0. The dissolved oxygen content should be 15% or more of the total manganese and iron expressed in ppm.
Birm is furnished in two grades: regular and fine. Regular Birm is generally recommended for industrial and municipal installations. Fine Birm is recommended for domestic application or in cases where the available backwash water is limited. Bed expansion of 35 to 50% in backwash is required for best results. 12 to15 GPM per square foot are required for backwashing regular Birm. 8 to 10 CPM per square foot are required for fine Birm.