Leaching behaviour of hazardous waste under the impact of different ambient conditions

Abstract

The overall objective of this study is to provide an improved basis for the assessment of the leaching behaviour of waste marked as hazardous partly stabilised (European waste catalogue code 19 03 04). Four samples of hazardous partly stabilised waste were subjected to two leaching tests: up-flow column tests and batch equilibrium tests. The research was carried out in two directions: the first aims at comparing the results of the two experimental setups while the second aims at assessing the impact of different ambient conditions on the leaching behaviour of waste. Concerning this latter objective the effect of mesophilic temperature, mechanical constraints and acid environment were tested through column percolation tests. Results showed no significant differences between batch and column leaching test outcomes when comparing average concentrations calculated at a liquid to solid ratio of 10:1 l kg TS. Among the tested ambient conditions, the presence of an acid environment (pH=4.5) accelerated the leaching process resulting in a higher cumulative released quantity measured on the majority of the investigated polluting substances. On the contrary, the effect of temperature and mechanical constraints seemed to not affect the process showing final contents even lower than values found for the standard test. This result was furthermore confirmed by the application of the principal component analysis.

Characterization of Excavated Waste of Different Ages in View of Multiple Resource Recovery in Landfill Mining

“…In order to analyze the relationships between observed variables and to extract a small number of latent factors, PCA is often used in the environmental field [34]. In this study PCA was applied with the objective of investigating in depth the studied parameters in relation to the application regarding WtE and/or WtM approach, although more commonly it is used to recognize sources of pollution [35]. All data analysis calculations were performed using the XLStat2018 software package, while the PCA was performed using IBM SPSS (Armonk, US).…”

Mitigation of Methane, NMVOCs and Odor Emissions in Active and Passive Biofiltration Systems at Municipal Solid Waste Landfills

“…[4][5][6]. The presence of NMVOCs in landfill gas is mainly due to the process of volatilization of compounds present in the waste during the anaerobic degradation processes [7] and to a lesser extent to the composition of the waste (e.g., paints, adhesive glues and solvents) [8][9][10]. A widely used mitigation strategy is LFG recovery for energy utilization or flaring, but over time, LFG generation will decline to a level where utilization is no longer feasible [11,12].…”

Biochemical Hydrogen Potential Tests Using Different Inocula

“…In this context, the European environmental policy is twofold: reduction of landfill disposal due to impacts and risks (e.g., odour and greenhouse gas emissions, groundwater contamination by leachate, etc.) [4,5], and valorisation of residues. In the matter of organic waste, the biorefinery concept fits well with this latter perspective.…”