Adsorption of Cadmium from Landfill Leachate on Wood-Derived Biochar: Non-linear Regression Analysis
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Adsorption of Cadmium from Landfill Leachate on Wood-Derived Biochar: Non-linear Regression Analysis Ali Daryabeigi Zand 1 & Maryam Rabiee Abyaneh 1 Received: 30 April 2020 / Accepted: 31 August 2020/ # Springer Nature Switzerland AG 2020
Abstract The feasibility of using wood-derived biochar (BC) to adsorb cadmium from
landfill leachate was investigated and modeled in the present study. The effect of contact time and biochar dosage on kinetics and isotherms of adsorption was investigated. Woodderived biochar was produced under the pyrolytic temperature of about 740 °C. The kinetics of Cd adsorption on biochar was analyzed using the pseudo-first-order, pseudosecond-order and Elovich models. Results indicated that the pseudo-second-order model can best describe the adsorption kinetics. Equilibrium adsorption capacity of Cd in the leachate system was evaluated using the Langmuir, linearized and non-linearized Freundlich and Temkin isotherms, and was found to have the following order in describing the adsorption of Cd from landfill leachate onto BC: Non-linearized Freundlich>Temkin>Langmuir>Linearized Freundlich. Use of the non-linearized Freundlich isotherm significantly reduced adsorption prediction error. Results showed that wood-derived biochar could be promisingly used for the removal of Cd from landfill leachate. Application of biochar has a promising prospect in the context of landfill leachate treatment. Highlights
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Pseudo-second-order and Elovich expressions well described kinetics of Cd adsorption onto biochar Non-linear Freundlich followed by Tekmin models best represented the experimental equilibrium data Linearization of Freundlich model significantly affected the prediction error structure
Keywords Landfill leachate . Cadmium . Biochar . Adsorption . Linearization error
* Ali Daryabeigi Zand [email protected]
1
School of Environment, College of Engineering, University of Tehran, No 23, Ghods St., Enghelab Ave, P.O. Box 14155-6135, Tehran, Iran
Zand A.D., Abyaneh M.R.
1 Introduction Landfill leachate may contain a wide range of contaminants at high levels which raise serious environmental and human health concerns. Effective removal of heavy metals from landfill leachate is of great concern due to the fact that toxic metals can seriously threaten soil and water resources, and therefore, the human health even at low concentrations. The majority of published research has focused on removal of ammonia-nitrogen and organic fraction of landfill leachates, such as using biological reactors (Phan et al. 2017), oxidation processes (Poblete et al. 2017), and membrane separation (Xu et al. 2017). High variation in quantity and quality of leachate generated in landfill sites makes selection of appropriate treatment approach difficult. Landfill leachate is heterogeneous in nature and may containa wide range of pollutants including heavy metals (Xue et al. 2014). Cadmium (Cd) is a ubiquitous nonessential trace metal that is continuously released into the environment through anthropogenic sources, with gr
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