| CQ-BR® is
an efficient and economical media for the Reduction of dissolved Iron
and Manganese compounds from water. It may be used in either gravity
fed or pressurized water treatment systems. CQ-BR® 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.
CQ-BR®, acting as a catalyst between the oxygen and the soluble iron
compounds, enhances the oxidation reaction of Fe++ to Fe+++ and produces
ferric hydroxide which precipitates and may be easily filtered. The physical
characteristics of CQ-BR® provide an excellent filter media which is
easily cleaned by backwashing to remove the precipitant. CQ-BR® is not
consumed in the iron removal operation and therefore offers a tremendous
economic advantage over many other iron removal methods.
Other advantages of
CQ-BR® 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 CQ-BR® does not require chemicals
for regeneration, only periodic backwashing is required. When using CQ-BR®
for iron removal, it is necessary that the water contains: no oil or hydrogen
sulfide; organic matter not to exceed 4-5 ppm; the D.O. content equal at
least 15% of the iron content with a pH of 6.8 or more. If the influent water
has a pH of less that 6.8, neutralizing additives such as CQ-CO®,
CQ-Ca® or soda ash may be used prior to the CQ-BR® filter to raise
the pH. A water having a low D.O. level may be pretreated by aeration.
Chlorination greatly reduces CQ-BR®’s activity. High concentrations
of chlorine compounds may deplete the catalytic coating. CQ-BR® is
furnished in two grades, regular and fine. Regular is generally recommended
for industrial, municipal and most domestic installations. Fine is recommended
on domestic installations where backwash rates are limited. Clack CQ-BR®
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 8.0-9.0 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. |
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