Leaching behaviour of hazardous waste under the impact of different ambient conditions.
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-1TS. 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.
DIEF, Department of Industrial Engineering, University of Florence, Via Santa Marta 3, 50139 Florence, Italy. Electronic address: isabella.pecorini@unifi.it.
Isabella
I
Pecorini
DIEF, Department of Industrial Engineering, University of Florence, Via Santa Marta 3, 50139 Florence, Italy.
Francesco
F
Baldi
DIEF, Department of Industrial Engineering, University of Florence, Via Santa Marta 3, 50139 Florence, Italy.
Donata
D
Bacchi
DIEF, Department of Industrial Engineering, University of Florence, Via Santa Marta 3, 50139 Florence, Italy.
Ennio Antonio
EA
Carnevale
DIISM, Department of Information Engineering and Mathematic, University of Siena, Via Roma 56, 56100 Siena, Italy.
Andrea
A
Corti
D004784:Environmental Monitoring; D006256:Hazardous Waste / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D006256:Hazardous Waste; D014874:Water Pollutants, Chemical
Batch leaching test; Column leaching test; Hazardous waste; Landfilling; Leachate; Partly stabilised waste