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Effects of Particle Size on Properties and Thermal Inertization of Bottom Ashes (MSW of Turin's Incinerator)

Effects of Particle Size on Properties and Thermal Inertization of Bottom Ashes (MSW of Turin's Incinerator)

Caterina Caviglia, Giorgia Confalonieri, Ingrid Corazzari, Enrico Destefanis, Giuseppe Mandrone, Linda Pastero, Renato Boero, Alessandro Pavese

Waste Manag. 2019 Feb 1;84:340-354.

PMID: 30691909

Abstract:

The aim of this study is twofold: (i) characterization of the bottom ashes from the Incinerator plant of the city of Turin (northern Italy), in terms of their chemical/phase compositions and capacity to release heavy metals in leachates, as a function of particle size; (ii) investigation of thermal treatments' efficacy to promote inertization of the same bottom ashes, exploring time-temperature ranges with t ≤ 6 h and T ≤ 1000 °C. Special attention is paid to macro-sampling techniques in order to have samples that are representative of the average bottom ashes production. Micro-XRF, ICP-OES, SEM-EDS, Ion Chromatography and X-ray powder diffraction were used to investigate bottom ashes and leachates. Bottom ashes are mainly constituted by an amorphous phase, ∼66-97 wt%, regardless of particle size; the remaining phases are quartz, calcite, Fe-oxides, melilite and other minor crystalline materials. The amorphous phase exhibits a relevant dependence on particle size, and undergoes dissolution in water up to 20 wt%, thus being the most important component in affecting chemical species release. The smaller the bottom ashes' particle size, the more the heavy metals (major species: Zn, Cu, Ti, Pb) and calcium contents increase, whereas silicon's decreases. Electrolytic current observations in combination with phase/chemical composition and metals release as a function of particle size, suggest that bottom ashes partition into two classes, i.e. ≥1 and <1 mm, for inertization purposes. Thermal treatments exhibit partial efficacy to curb heavy metals mobility: whilst they reduce Cu release, they lead to a inverse effect in the case of Cr.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS21223	Quartz (particle size)			Price

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