Description
TRIHIGH Birm is
anefficient and economical
media for the reduction of dissolved iron and manganese compounds
from raw water supplies.
Remove Iron:
Itmay be used in either gravity fed or pressurized
water treatment systems. Birm acts as an insoluble catalyst to
enhance the reaction between dissolved oxygen (D.O.) 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
reaction of Fe2+ to Fe3+ 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.
Other advantages of Birm
include; long material life with relatively low attrition loss, a
wide temperature performance range and extremely high removal
efficiency. Negligible labor costs are involved because Birm does
not require chemicals for regeneration, only periodic backwashing
is required.
When using Birm for iron
removal, it is necessary that the water: contain no oil or hydrogen
sulfide, organic matter not to exceed **5 ppm, the D.O. content
equal at least *5% of the iron content with a pH of 6.8 or more. If
the influent water has a pH of less that 7.0. Calcite or soda ash
may be used prior to the Birm filter to raise the pH. A water
having a low D.O. level may be pretreated by aeration.
Additions of chemicals to
influent or backwash water which contacts Birm media may inhibit
iron or manganese removal or may break down or coat Birm media.
Chlorination greatly reduces Birm’s activity. High concentrations
of chlorine compounds may deplete the catalytic coating.
Polyphosphates are known to coat Birm and reduce Birm’s ability to
remove iron or manganese. Before adding any chemical to the
influent or backwash water, the chemical's compatibility with Birm
should be thoroughly tested
Remobe Mn.
TRIHIGH Birm may also be used for
manganese reduction with the same dependability as iron removal. In
these applications the water to be treated should have a pH of
8.**9.0 for best results. If the water also contains iron, the pH
should be below 8.5. High pH conditions may cause the formulation
of colloidal iron which is very difficult to filter out. All other
conditions remain the same for either manganese or iron
removal.
