Activated Carbon: Sorption of DOC from Wastewater

by Frederick S. Cannon, (M.ASCE), Engr.; Brown and Caldwell, Consulting Engr., Inc., Pasadena, Calif. 91109,
Paul V. Roberts, (M.ASCE), Adjunct Professor; Dept. of Civ. Engrg., Stanford Univ., Stanford, Calif. 94305,

Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 4, Pg. 766-783

Document Type: Journal Paper


Activated carbons were prepared from a lignocellulosic material (prune pits) by pyrolysis to 900°C, and then activation in CO2 at 900°C for activation times ranging from 15 to 60 minutes. These were compared with each other and to Filtrasorb 400 and Aquanuchar A with regard to specific surface area (N2, 77K), pore volume distribution, and the rate and extent of adsorption of dissolved organic carbon (DOC) from filtered wastewater secondary effluent. It was found that the magnitudes of the above variables increased with increased time of activation, and that the magnitudes were greater for extensively activated fruit pits than for Filtrasorb 400 and Aquanuchar A. Moreover, the uptake of DOC onto these powdered activated carbons in batch reactors behaved according to a model based on linear equilibrium and rate controlled by pore diffusion. The apparent diffusivities estimated by this model were in the range of 1 x 10-¹0 to 3 x 10-¹0 m²/s, which conform to expected values.

Subject Headings: Activated carbon | Sorption | Wastewater management | Diffusion (porous media) | Heat treatment | Adsorption | Dissolved solids | Carbon compounds | Colorado | United States

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