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Article

Integrated Treatment at Laboratory Scale of a Mature Landfill Leachate via Active Filtration and Anaerobic Digestion: Preliminary Results

Department DICEAM, Via Graziella, Mediterranea University of Reggio Calabria, Loc. Feo di Vito, I-89122 Reggio Calabria, Italy
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Academic Editor: Antonio Panico
Water 2021, 13(20), 2845; https://doi.org/10.3390/w13202845
Received: 23 September 2021 / Revised: 4 October 2021 / Accepted: 9 October 2021 / Published: 13 October 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
The management of mature landfill leachate (MLL) represents an increasingly crucial issue to tackle. In this study, the feasibility of an integrated treatment was investigated at the laboratory scale using synthetic leachate with the objective of maximizing the recovery of potentially useful compounds present in leachate (especially ammonia nitrogen). First, in order to remove heavy metals, active filtration of the MLL was carried out using zero-valent iron (ZVI) mixed with either lapillus or granular activated carbon (GAC). The average removal rates for the ZVI/lapillus and the ZVI/GAC filter were 33%, 85%, 66%, and 58% and 56%, 91%, 67%, and 75% for COD, Cu, Ni, and Zn, respectively. Then, pre-treated MLL was added during the anaerobic digestion (AD) of cellulose with the aim of providing bacteria with macro (i.e., ammonia nitrogen) and micro (e.g., residual heavy metals) nutrients. After 38 days, the best performance in terms of cumulative methane production (5.3 NL) and methane yield (0.26 NL/gVSadded on average) was recorded in the reactor fed with the lowest dosage (17.9 mL/d) of MLL pre-treated by the ZVI/lapillus filter. The main issue that emerged during AD was the possible inhibition of the process linked to an excessive presence of humic substances; however, in future experiments, this problem can be solved through an optimization of the management of the whole process. The residual digestate from AD, rich in nitrogen and humic substances, may be safely used for agriculture purposes, closing the cycle of MLL management. View Full-Text
Keywords: anaerobic digestion; granular activated carbon; lapillus; mature landfill leachate; recovery; zero valent iron anaerobic digestion; granular activated carbon; lapillus; mature landfill leachate; recovery; zero valent iron
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MDPI and ACS Style

Fazzino, F.; Bilardi, S.; Moraci, N.; Calabrò, P.S. Integrated Treatment at Laboratory Scale of a Mature Landfill Leachate via Active Filtration and Anaerobic Digestion: Preliminary Results. Water 2021, 13, 2845. https://doi.org/10.3390/w13202845

AMA Style

Fazzino F, Bilardi S, Moraci N, Calabrò PS. Integrated Treatment at Laboratory Scale of a Mature Landfill Leachate via Active Filtration and Anaerobic Digestion: Preliminary Results. Water. 2021; 13(20):2845. https://doi.org/10.3390/w13202845

Chicago/Turabian Style

Fazzino, Filippo, Stefania Bilardi, Nicola Moraci, and Paolo S. Calabrò 2021. "Integrated Treatment at Laboratory Scale of a Mature Landfill Leachate via Active Filtration and Anaerobic Digestion: Preliminary Results" Water 13, no. 20: 2845. https://doi.org/10.3390/w13202845

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