A modeling approach to bioregeneration of granular activated carbon loadedwith phenol and 2,4-dichlorophenol

A predictive isotherm model was developed to evaluate the extent of biorege neration of granular activated carbon loaded with phenol and 2,4-dichloroph enol (2,4-DCP). Two basic substrates (116 mg/L of phenol and 100 g/L 2,4-DC P) as single solute were prepared. The mixture of them was provided to biso lute system for assessing the competitive adsorption. The effect of by-prod ucts, which were generated during biodegradation of substrate and measured as GOD, on bioregeneration in the bisolute was investigated. Freundlich ads orption parameters (K-ads and 1/n) of 2,4-DCP were obviously higher than th ose of phenol in both single and bisolute. By-products in the bulk solution brought an adverse effect on adsorption capacity of GAC in all cases. By t aking into account the by-product effect on adsorption, the Freundlich isot herms were used to formulate a predictive model of bioregeneration. Simulat ed results showed good consistency of observed results, Practical relevant of the proposed model for assessing of bioregeneration in the wastewater tr eatment was discussed by applying model to the BAC-SBR in the steady-state operation.