Release of Trace Elements from Bottom Ash from Hazardous Waste Incinerators

Bottom ash is the major by-product of waste incineration and can contain trace elements (As, Cd, Co, Cu, Cr, Mo, Ni, Pb, and Zn) with concentrations up to thousands of mg·k−1. In this study, a combination of different extractions and leaching tests (i.e., CH3COOH and ammonium-EDTA (Ethylenediaminetetraacetic acid) extractions and pHstat leaching tests) was used to investigate the potential release of trace elements from bottom ash samples derived from hazardous waste incineration plants. Although large variations have been found in the release of trace elements by different extractions, in general, the highest concentrations of most trace elements (except As and Mo) were released with the CH3COOH extraction, whereas the release of As and Mo was highest with the ammonium-EDTA extraction. Kinetics of element release upon acidification based on a pHstat leaching test at pH 4 could be related to the solid-phase speciation of some selected trace elements. The relatively high-potential mobility and elevated total concentrations of some trace elements imply a threat to the environment if these bottom ashes are not treated properly. Results of the present study may be useful to develop potential treatment strategies to remove contaminants and eventually recover metals from bottom ash.

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Experiment-based modelling of the mechanical behaviour of non-hazardous waste incineration bottom ashes treated by hydraulic binder

MATEC Web of Conferences ◽

10.1051/matecconf/201814901038 ◽

2018 ◽

Vol 149 ◽

pp. 01038 ◽

Cited By ~ 2

Author(s):

Libasse Sow ◽

Fabrice Bernard ◽

Siham Kamali-Bernard ◽

Cheikh Mouhamed Fadel Kébé

Keyword(s):

Numerical Model ◽

Hazardous Waste ◽

Bottom Ash ◽

Waste Incineration ◽

Mesoscopic Scale ◽

The Road ◽

Hydraulic Binder ◽

Indentation Tests ◽

Intrinsic Mean ◽

Hazardous Waste Incineration

Instrumented indentation tests have been carried out on an isolated 25 mm diameter particle of Non-Hazardous Waste Incineration bottom ash. These tests have enabled one to assess the intrinsic mean reduced modulus of elasticity “Er” of the particles. This result is used as input data for a 3D numerical model of Representative Elementary Volumes (REV) of a road gravel made with this kind of by-products. This numerical model is based on a multi-scale hierarchical modelling strategy. The aggregates treated with cement have been decomposed into two REV at the sub-mesoscopic and mesoscopic scales. The numerical simulations campaign (“virtual laboratory”) lead to the following results. At the sub-mesoscopic scale, we determined the input parameters for the Concrete Damaged Plasticity Model (CDPM) used at the mesoscopic scale. At the mesoscopic scale, the mechanical characteristics of the road aggregates usually determined through experiments have been found. The non-hazardous waste incineration bottom ashes treated by hydraulic binder was classified into mechanical classe 3.

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Original Experimental Campaign of Indentation Instrumented on Aggregates of Non-Hazardous Waste Incineration Bottom Ash to Study the Heterogeneity of their Rigidity

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.805.177 ◽

2019 ◽

Vol 805 ◽

pp. 177-182 ◽

Cited By ~ 1

Author(s):

Libasse Sow ◽

Siham Kamali-Bernard ◽

Gérard Mauvoisin ◽

Olivier Bartier ◽

Fabrice Bernard

Keyword(s):

Elastic Modulus ◽

Hazardous Waste ◽

Experimental Work ◽

Elastic Moduli ◽

Bottom Ash ◽

Waste Incineration ◽

Instrumented Indentation ◽

Experimental Campaign ◽

Hazardous Waste Incineration ◽

Spherical Tungsten Carbide

An extensive experimental work of instrumented indentation on isolated particles of Non-Hazardous Waste Incineration bottom ash (NHWI) is presented in this paper. The aggregates studied come from the Garenne quarries at Vignoc (Brittany, France). Two spherical tungsten carbide indenters of respective 0.5 and 140 mm radius “R” were used for test series “A” and “B”. The particles studied have diameters ranging between 20 and 25 mm. With a 0.5 mm radius indenter, average reduced elastic moduli ranging from 15 to 68 GPa were found. An average reduced elastic modulus of 15 GPa was found with the 140 mm radius indenter. The experiments made it possible to highlight the particular heterogeneity that characterizes the rigidity of the types of aggregates studied.

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Potentially toxic elements in bottom ash from hazardous waste incinerators: an integrated approach to assess the potential release in relation to solid-phase characteristics

Journal of Material Cycles and Waste Management ◽

10.1007/s10163-016-0505-0 ◽

2016 ◽

Vol 19 (3) ◽

pp. 1194-1203 ◽

Cited By ~ 4

Author(s):

Tran Thi Thu Dung ◽

Elvira Vassilieva ◽

Asefeh Golreihan ◽

Nguyen Ky Phung ◽

Rudy Swennen ◽

...

Keyword(s):

Hazardous Waste ◽

Toxic Elements ◽

Solid Phase ◽

Bottom Ash ◽

Integrated Approach ◽

Potentially Toxic Elements ◽

Waste Incinerators

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Experimental Estimation of the Elastic Modulus of Non-Hazardous Waste Incineration Bottom Ash Aggregates by Indentation Tests - Microanalysis of Particles by Scanning Electron Microscopy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1145.80 ◽

2018 ◽

Vol 1145 ◽

pp. 80-84 ◽

Cited By ~ 3

Author(s):

Libasse Sow ◽

Siham Kamali-Bernard ◽

Olivier Bartier ◽

Gérard Mauvoisin ◽

Fabrice Bernard

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Hazardous Waste ◽

Chemical Elements ◽

Bottom Ash ◽

Waste Incineration ◽

Instrumented Indentation ◽

Indentation Tests ◽

Hazardous Waste Incineration ◽

Scanning Electron

An original experimental campaign never conducted until now on Non-Hazardous Waste Incineration aggregates is presented in this paper. The experiments were conducted in two phases: Scanning Electron Microscopy (SEM) and instrumented indentation. A cartography followed by a series of Quantitative Chemical Microanalysis (QCM) was carried out on the 0/12.5 mm fraction of the particle size distribution. Instrumented indentation tests were carried out on isolated particles of 25 mm in diameter. Observations at the SEM yielded the exact chemical composition of the bottom ashes. It has been found that the proportions of the chemical elements composing the material are slightly different from those of other studies. This difference has made it possible to note that the zone of production of the bottom ash significantly influences their physicochemical characteristics. From the indentation curves obtained, the “Olivier and Pharr” method was used to determine the reduced modulus of elasticity “Er”. Mean values of approximately 65 GPa and 40 GPa were obtained respectively for vitreous phases and less vitreous ones.

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