Waste materials composited into an adsorbent for landfill leachate treatment

Abstract

The ability of a composite adsorbent composed primarily of various waste materials to adsorb heavy metals, NH3-N, and chemical oxygen demand (COD) from landfill leachate was investigated through batch sorption experiments. The study determined the optimal contact time and adsorbent dosage for the removal of Pb, Zn, Cu, Fe, NH3-N, and COD to be 15, 90, 30, 180, 30, and 30 min, respectively. The corresponding optimum adsorbent dosages were determined to be 5, 30, 5, 15, 5, and 30 g, respectively. The composite adsorbent exhibited high removal efficiencies, achieving the following maximum values: 96.4% for Pb, 92.7% for Zn, 60.3% for Cu, 87.1% for Fe, 75.0% for NH3-N, and 67.5% for COD. Pb and Fe showed the best fit with a Langmuir isotherm model, with corresponding adsorption capacities of 0.0165 and 1.14 mg/g, respectively. For Zn, Cu, NH3-N, and COD, the equilibrium data demonstrated the best fit with an Elovich isotherm model, with adsorption capacities of 0.004, 0.005, 0.016, and 4.29 mg/g, respectively. The kinetic data followed the pseudo-second-order kinetic model. It presented a potential solution for the disposal of the waste materials from which it was derived.

Leachate treatment via electrocoagulation–coal‐based powdered activated carbon process: Efficiencies, mechanisms, kinetics, and costs

“…In order to treat landfill leachate, a number of traditional chemical and physical processes have been suggested, such as adsorption with different adsorbent (Detho et al, 2021; Elgarahy et al, 2023; Kumara & Dayanthi, 2023; J. Liu et al, 2024; Salama et al, 2022), ion exchange with various resins (Aziz et al, 2020; Bashir et al, 2010; Scandelai et al, 2020), reverse osmosis (Bouchareb et al, 2022; Folino et al, 2024; García‐Pacheco et al, 2022), electrocoagulation (Guo et al, 2022; Hamid et al, 2021; R. Li et al, 2017; Ogedey & Oguz, 2024), electrochemical oxidation (Tang et al, 2022; Vocciante et al, 2021; Zhao & Zhao, 2021), fenton processes (Crispim et al, 2022; Feng et al, 2022; X. Li et al, 2018), advanced oxidation processes (Kanmani & Dileepan, 2023, Shuo Li et al, 2022, Y. Liu et al, 2022), dissolved air flotation (Adlan et al, 2011), and coagulation/flocculation (Lessoued et al, 2017; Reddy et al, 2022; Zakaria et al, 2022).…”