A SIMPLIFIED PREDICTIVE MODEL FOR BIOLOGICALLY ACTIVATED CARBON FIXED-BEDS

Previous researchers have indicated that biological activity in fixed bed adsorption systems can dramatically increase the expected capacity of granular activated carbon beds. The adsorbate species used in this work were acid dyes found in textile industry wastewater which had az o and di-azo structures. Pure bacterial cultures were selected which h ad the ability to degrade the dyes. Granular activated carbon (GAG F40 0) beds seeded with pure cultures showed increased dye removal over st erile beds. The performance of the system was described using a model which combines carbon adsorption and biological degradation of the ads orbate on the surface of the particle using the Monod equation. The mo del proved effective in describing the initial stages of the biologica lly activated carbon system. (C) 1997 Elsevier Science Ltd.