Granular Activated Carbon (GAC)

When granular carbon is the right format

Granular activated carbon sits in a fixed bed while the water or gas flows through it, so it suits steady, continuous treatment. The grains are large enough to hold in a vessel and to backwash, and a spent charge can be replaced or reactivated as a single job. If your load comes and goes rather than running all year, look at powdered activated carbon as well.

Three decisions that set the specification

• Base material. Coconut shell for small molecules and clean duty, coal for larger molecules and heavier industrial streams.
• Iodine value. We supply 400, 500, 800, 900, 1000, 1100 and 1200+ mg/g. Higher suits small molecules, but the right number depends on what you are removing.
• Mesh size. Coarser grains lower the pressure drop, finer grains speed up contact. 4x8, 8x16, 12x40, 16x31 and 20x40 are available.