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Rapid industrialization has resulted in the generation of large quantities of aqueous effluents containing high levels of toxic pollutants.The use of biowastes for the removal of toxic pollutants or for the recovery of valuable resources from aqueous wastewaters is one of the most recent developments in environmental or bioresource technology [1].Among various microbial organisms,Escherichia coli is one of the fermentation biowaste resources that can be gained abundantly and cheaply [2-4].In this study,the potential of E.coli as adsorbent was examined based on adsorption mechanism.Potentiometric titration technique was used to quantify functional groups present on the biomass,and their identifications were achieved by examining FT-IR spectra of the biomass.To examine adsorption behavior of the biomass according to adsorbate species,cationic Cd(II),anionic As(V),cationic methylene blue and anionic reactive red 4 were used in batch biosorption experiments.The effects of contact time and solution pH on the biosorption of each adsorbate were examined.Various kinetic models such as pseuo first order and second order equations were used to fit the kinetic batch data.Langmuir isotherm model was used to determine maximum adsorption capacity of the biomass.Finally,adsorption mechanism of each adsorbate was elucidated and the potential of the fermentation biowaste was also discussed.