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Calgon Carbon - Model PWA -Acid Washed Powdered Activated Carbon
PWA is a powdered activated carbon with low acid soluble iron content. It is specifically designed for use with low pH liquids or when a low metal/ash leachable activated carbon is desired. The product is acid washed during the manufacturing process resulting in a product with very low acid soluble iron content. PWA powdered carbon has a particle size that provides rapid rates of adsorption and filtration. PWA is manufactured by high temperature steam activation from select grades of bituminous coal to produce a product of high density. PWA provides the benefits of fast filtration, low product retention, easy wettability and minimum dusting characteristics. This product complies with the requirements for activated carbon as defined by the Food Chemicals Codex (FCC) (7th Edition) published by the U.S. Pharmacopeia.
Type PWA Pulverized Carbon has a particle SIZE of 65-75% minus 325 mesh (U. S. Sieve Series, opening of 44 microns) in order to provide rapid rates of adsorption and filtration. Manufactured by high temperature steam activation from selected grades of bituminous coal to produce a product of high density, Type PWA provides the benefits of fast filtration, low product retention, easy wettability and minimum dusting characteristics.
Typical Physical Properties:
Total Surface Area
(N2 BET Method), m2/g: 900-1000
Apparent Density
(Bulk Density, dense packing), g/cc: 0.51
Real Density (He Displacement), g/cc: 2.1
Pore Volume (within particle) cc/g: 0.9O
Specific Heat at 100°C: 0.25
Acid Soluble Ash, Wt. %: 44
Ash, Wt. %: 6.0
pH: 6.0-8.0
Because of its high bulk density and optimum particle size, Type PWA Pulverized Activated Carbon exhibits consistently low filter cake resistance which permits operational advantages such as:
- Decreased filtration time.
- Increased plant throughput i.e. higher filtration flow rates.
- Lower filter area requirements.
- Less filter aid for satisfactory cake.
- Lower filter maintenance costs.
- Lower filtration labor costs.