Clack
granular activated carbon is designed for reduction of tastes,
odors and dissolved organic chemicals from municipal and industrial
water supplies. Manufactured in the United States from select
grades of bituminous coal to produce a high density, durable
granular product capable of withstanding the abrasion and
dynamics associated with repeated hydraulic transport, backwashing
and mechanical handling.Activation is carefully controlled
to produce exceptionally high internal surface area with optimum
pore size for the adsorption of a broad range of high and
low molecular weight organic contaminants.
One of the most common applications for Clack High Activity
Carbon (HAC) is the reduction of the undesirable tastes and
odors present in many chlorinated water supplies. HAC has
been successful for many years in the reduction of free chlorine
from water supplies. The end product is clean, fresh water
with no objectionable taste or odor characteristics. High
Activity Carbon (HAC) may be used for a variety of water treatment
applications requiring the reduction of chlorine, tastes,
and odors.
ADVANTAGES
- HAC is an outstanding material for applications requring
taste, odor and dissolved organic chemical removal from
water with suspended matter present. This product can be
used for filtering waters having a wide range of pH levels.
- Large surface area results in an exceptionally high capacity
and efficiency.
- Balanced pore structure gives a more efficient adsorbtion
range.
- HAC is very durable so losses due to attrition are kept
to a minimum.
- HAC has a very high carbon-low ash content.
- Service rates of 5 gpm/sq. ft. are practical for ordinary
taste, odor and chlorine loads.
- HAC will impart a high polish to the filtered water.
To obtain maximum efficiency of the activated carbon in the
adsorption process, it is desirable to have the greatest possible
surface area in the smallest practical volume. This is necessary
because the rate of adsorption is proportional to the amount
of surface area of the adsorbing medium media. HAC has a surface
area of 850 square meters per gram. This results in high efficiency
and greater system economy. Clack has for many years provided
activated carbon to the OEM and replacement market as a pre-treatment
for other water purification systems as well as for use in
individual treatment equipment for the removal of specific
impurities. HAC requires periodic backwashing to eliminate
accumulated suspended matter and to re-grade the filter bed.
HAC has an extremely high capacity but must be replaced when
the filter bed loses the capacity for reduction of taste and
odor. HAC may be used in either domestic or industrial applications
using gravity flow or pressurized filter vessels.
PHYSICAL PROPERTIES
Color: Black
Mesh Size: 12 x 40
Bulk Density: 31 lbs./cu. ft.
Specific Gravity: 1.4-1.5 gm/cc
Effective Size: 0.55-0.75 mm, 0.65 typical
Water Soluble Ash: less than 0.5%
Iodine #: 850 min., 900 typical
Abrasion #: 75 min., 81 typical
Moisture as packed: 2% max., 0.7% typical
Meets American Water Works Association standard B604-96
CONDITIONS FOR OPERATION
- Water to be filtered should preferably be free of oil
and suspended matter
- The water to be filtered should be relatively free of
iron and turbidity for maximum service life
- Water pH range: wide range
- Bed depth: 26-30 in.
- Freeboard: 50% of bed depth (min.)
- Service flow rate: 5 gpm/sq. ft.
- Backwash flow rate: 10-12 gpm/sq. ft.
- Backwash bed expansion: 30-40% of bed depth
- Upon installation, backwash to remove carbon fines before
placing unit into service
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