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Waste Management & Research, Vol. 14, No. 1, 29-41 (1996)
DOI: 10.1177/0734242X9601400104

Stabilization of Residue Containing Heavy Metals By Means of Matrices Generating Calcium Trisulphoaluminate and Silicate Hydrates

V. Albino

Università degli Studi di Napoli "Federico ", Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, 80125 Napoli, Italy

R. Cioffi

Università degli Studi di Napoli "Federico ", Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, 80125 Napoli, Italy

L. Santoro

Università degli Studi di Napoli "Federico ", Dipartimento di Chimica, Via Mezzocannone 4, 80134 Napoli, Italy

G.L. Valenti

Università degli Studi della Basilicata, Dipartimento di Ingegneria e Fisica dell'Ambiente, Via della Tecnica 3, 85100 Potenza, Italy

Two binding matrices based on blast furnace slag or fly ash/lime mixtures were studied in relation to the stabilization/solidification of a residue from a municipal solid waste incinerator. Their use is of interest because of the formation of calcium trisulphoaluminate and silicate hydrates.

Mixtures of the above matrices with up to 80% of the incinerator residue were paste-hydrated and cured for 28 days at 25°C and 100% relative humidity. The effect of added waste on the hydration phenomena was studied by means of differential thermal analysis and X-ray diffraction analysis. The effectiveness of these systems as stabilization/solidification matrices was checked by means of mechanical and leaching tests. Cured samples with up to 20-40% of added waste gave compressive strengths sufficiently high for reuse as building materials.

The U.S. Environmental Protection Agency leaching test has shown that disposal in a landfill in which no facilities for collecting and treating percolating waters are provided, is possible with 40-60% of waste content.

Finally, the American Nuclear Society dynamic leaching test has shown that the entrapment is mainly dependent on the physical binding potential of the matrices. © 1996 ISWA

Key Words: Stabilization/solidification • toxic and hazardous waste • municipal solid waste incineration • coal fly ash • blast furnace slag • chemical gypsum • ettringite • compressive strength • leaching.


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