ANAEROBIC TREATMENT UTILIZING THE FUNCTION OF ACTIVATED CARBON

Granular activated carbon (GAC) was used as supporting medium for bact eria in anaerobic process. The effectiveness of using GAC was examined with laboratory-scale experiments. Synthetic wastewater containing ph enol was converted to methane more successfully in fluidized bed using GAC. Fluctuation in influent concentration of phenol was intentionall y made to examine the dynamic response of the process. Temporary incre ase of influent phenol from 400 mg/l to 1000 mg/l, 2000 mg/l, and even to 4000 mg/l for 4 days did not affect the effluent phenol as much as methane production because adsorption and desorption capacity by GAC functioned as stabilizer of the fluctuation. The adsorbed phenol was t hen gradually degraded into methane. Higher biomass concentration and lower adsorbed phenol were observed in the top part of the fluidized b ed than in the bottom part. (C) 1997 IAWQ. Published by Elsevier Scien ce Ltd.