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Continuous column adsorption of leachate onto orange biochar

Samara Maria

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Year 2021
Type of Item Diploma Work
Bibliographic Citation Maria Samara, "Continuous column adsorption of leachate onto orange biochar", Diploma Work, School of Chemical and Environmental Engineering, Technical University of Crete, Chania, Greece, 2021
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The aim of this thesis was to evaluate the phenolic compound adsorption from landfill leachate on activated biochars produced from orange peels. Initially, the orange peels were pyrolyzed at 600oC, in order to convert the material into biochar. The biochars were chemically activated by potassium hydroxide (KOH) at 800oC. The two materials were analyzed for specific surface area, morphology and their surface structure by BET, SEM-EDS and FTIR. Studies on the effect of various parameters such as the adsorbent dose and the effect time were conducted in batch adsorption experiments, whereas the dilution ratio, flow rate and regeneration cycles were investigated in fixed-bed column experiments. The results obtained from the column experiments were then modeled using the Thomas, Bohart – Adams and Yoon – Nelson models. It was observed that for the batch experiments, the behavior of the two materials was similar, in terms of phenol and color removal, with a dose of 1 g and processing for 48 h. Regarding the fixed-bed column experiments, it was concluded that for different dilutions, such as (1/20), (1/40) and (1/50), the breakthrough time varied from 180, 240 and 345 min, respectively. Concerning the biochar regeneration, it was shown that after the first circle the adsorption efficiency was reduced. Finally, the model that best described the column adsorption was the Thomas model, as it showed the best correlation coefficient (R2 = 0.7602). In conclusion, the activated biochar presented the best removal efficiency in terms of phenolic compounds and color.

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