Efficient adsorption model and experimental study of fly ash on copper in wastewater
The industrial waste fly ash was used as an adsorbent to remove copper from wastewater with the convention-al adsorption and efficiency adsorption processes.Adsorption equilibrium can be reached after 20 minutes of adsorption with the initial copper concentration of 10 mg/L and the fly ash dosage of 0.5 g/L.The adsorption capacity was 15.58 mg/g,the desorption rate is only 0.12%,and the adsorption process conforms to the Langmuir adsorption isotherm.Based on these characteristics,a mathematical model of effective adsorption process was established.The model parameters were obtained through response surface experiments and verified by experiments.Efficient adsorption experiment results showed that the copper concentrations in the effluent kept constant within 10 cycles.The calculated values of the model were in good agreement with the experimental ones indicating that the model can accurately predict the copper concentra-tion in the effluent.The smaller the retention factor of the process is,the lower the copper concentration is.The adsorp-tion capacity reached 19.62 mg/g with the retention factor is 0.25.Compared with the conventional adsorption,the ad-sorption capacity increased by 25.9%.
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