Powdered activated carbon dosing: which feed system reduces handling problems?

Powdered activated carbon dosing: which feed system reduces handling problems?

• A. Dry gravimetric feeders
• B. Volumetric feeders
• C. Slurry feed system
• D. Helix-type feeders

Answer: (C)

Using a slurry feed system for powdered activated carbon focuses on reducing handling problems by suspending the carbon in water so it’s pumped rather than dumped as a dry powder. The slurry minimizes dust, inhalation risks, and material loss, and it allows metering to be done with a pump rather than by feeding loose solids. Dry options, like gravimetric or volumetric feeders and helix-type screws, rely on handling and flowing dry powder, which can dust, bridge, or vary with bulk density, leading to more feeding problems and inconsistent dosages.

Using a slurry feed system for powdered activated carbon focuses on reducing handling problems by suspending the carbon in water so it’s pumped rather than dumped as a dry powder. The slurry minimizes dust, inhalation risks, and material loss, and it allows metering to be done with a pump rather than by feeding loose solids. Dry options, like gravimetric or volumetric feeders and helix-type screws, rely on handling and flowing dry powder, which can dust, bridge, or vary with bulk density, leading to more feeding problems and inconsistent dosages.