Birm Filter Systems are efficient and economical for the reduction of dissolved iron and manganese compounds from raw supplies. Birm acts as an insoluble catalyst to enhance the reaction between dissolved oxygen (D.O.) and the iron compounds. 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.

When using Birm for iron removal, it is necessary that the water contain no oil or hydrogen sulfide, organic matter not to exceed 4-5 ppm, the D.O. content must equal at least 15% of the iron content with a pH of 6.8 or more. If the D.O. content is below 15% a Hellenbrand Aeration System is used to increase the D.O. content. If the pH content is low a Hellenbrand pH adjustment system is used. Chlorination greatly reduces Birm's activity. High concentrations of chlorine compounds may deplete the catalytic coating on birm.

When using Birm for manganese reduction with no iron present the pH of the water should be adjusted to 8.5 - 8.7 for best results. If the water also contains iron, the pH should be adjusted to 8-8.5, as higher pH levels may result in collodial iron whichis very difficult to filter out.

Standard Filter Systems are available from 10" - 72" diameter vessels, from single to multiple tank designs with a wide range of controls.

Hellenbrand offers standard and custom designs to meet any flow requirements.

Birm Capacity Specifications

Birm Filter Systems Brochure (800308)