| Simulated wastewater containing o-,m- and p-cresol was used respectively to study the effects of substituted position on adsorption and desorption and the feasibility of activated carbon adsorption bioregeneration treatment. According to the isotherm, the adsorbability sequences in the order of p-cresol >o-cresol >m-cresol, which is positively correlated to pKa and negatively correlated to solubility and critical oxidation potential (COP); and the desorbability sequences in the order of o-cresol>m-cresol>p cresol, which is negatively correlated to boiling point and viscosity. According to comparative analysis, irreversible adsorption is found to be the main reason for differences between adsorption and desorption isotherms. A mathematical statistics method was applied to estimate the amount of irreversible adsorption. The irreversible adsorption amounts of o, m, p-cresol are 27.9 mg/g, 28.5 mg/g and 33.4 mg/g, respectively. |
