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

The management of mature landfill leachate (MLL) represents an increasingly crucial issue to tackle. In this study, the feasibility integrated treatment was investigated at laboratory scale using synthetic with objective maximizing recovery potentially useful compounds present in (especially ammonia nitrogen). First, order remove heavy metals, active filtration MLL carried out zero-valent iron (ZVI) mixed either lapillus or granular activated carbon (GAC). average removal rates for ZVI/lapillus and ZVI/GAC filter were 33%, 85%, 66%, 58% 56%, 91%, 67%, 75% COD, Cu, Ni, Zn, respectively. Then, pre-treated added during anaerobic digestion (AD) cellulose aim providing bacteria macro (i.e., nitrogen) micro (e.g., residual metals) nutrients. After 38 days, best performance terms cumulative methane production (5.3 NL) yield (0.26 NL/gVSadded on average) recorded reactor fed lowest dosage (17.9 mL/d) by filter. main that emerged AD possible inhibition process linked excessive presence humic substances; however, future experiments, problem can be solved through optimization whole process. digestate from AD, rich nitrogen substances, may safely used agriculture purposes, closing cycle management.