A perturbation approach to quantifying sorption onto granular activated carbon
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Persistence of pollutants in wastewater and drinking water treatment plants are one of the challenges in environmental problems. Measurement of pollutants in the effluent solid or sludge still remains challenging. A perturbation method was developed and validated to determine isotherm constants when solid phase concentrations cannot be measured. To accomplish this, bottle point tests were conducted in the laboratory using dilution perturbation on a system in equilibrium containing methylene blue as the adsorbate and granular activated carbon as the adsorbent. Linear, Freundlich and Langmuir adsorption isotherms were used to describe the experimental data. Langmuir isotherm fitted the data best with maximum monolayer adsorptive capacity of 417.7 mg/g and adsorptive strength of 3.97 L/mg. Perturbation model predictions were not too sensitive for strength of adsorptions given by Langmuir and Freundlich equations. However, the model is good for predicting maximum monolayer adsorptive capacity and Freundlich constants.