Environmental behaviour of a construction made of a mixture of hydraulic binders and air pollution control residues from municipal solid waste incineration Part 1. Physico-chemical characterisation and modelling of the source term R. Barna a,b, *, Z. Rethy a , A. Imyim a , Y. Perrodin b , P. Moszkowicz a , L. Tiruta-Barna a a LAEPSI, National Institute for Applied Sciences, 69621 Villeurbanne Cedex, Lyon, France b POLDEN, National Institute for Applied Sciences, BP 2132, 69603 Villeurbanne Cedex, Lyon, France Received 15 October 1999; received in revised form 7 March 2000; accepted 3 April 2000 Abstract The reuse of waste materials requires the development of assessment methods for the long-term release of pollutants (source term) from wastes (or materials containing wastes) in contact with water. These methods depend on the scenario conditions: char- acteristics of the materials (especially physical structure and composition), contact with water. The scenario studied here is a water storage reservoir for fire fighting. The reservoir construction is made of a mixture of hydraulic binders and air pollution control (APC) residues from a municipal solid waste incinerator (MSWI). The modelling of the source term is performed in 5 steps ranging from the physico-chemical characterisation of the material to the validation of the proposed model by means of field simulation devices. This article presents the first steps of the methodology: physico-chemical characterisation of the source term, identification of the main transfer mechanisms and laboratory scale modelling of the source term. During the physico-chemical characterisation, it has been shown that the solidified waste shows a high basic capacity and that a relative decrease in pH during leaching favours retention of the main pollutants. During the first leaching sequences, the dynamic leaching tests show that the release of pollutants such as cadmium, arsenic, zinc and lead is extremely low but that the release of alkaline species (sodium and potassium) and chlo- ride is very high from the beginning, whereas the release of calcium remains very high even after 3600 h of leaching. Identification of the main transfer mechanisms concludes that the release of soluble pollutants is the combined result of diusional transfer of pol- lutants in the solution and the physico-chemical specificity of the species. The modelling based on these features enables a good simulation of the release but reveals a deviation from the experimental results after 500 h for alkaline species and 1000 h for Ca and Cl leaching. However, this deviation only appears after release of the major part of these elements. # 2000 Elsevier Science Ltd. All rights reserved. Keywords: Stabilisation; Solidification; Waste; Leaching; Reuse; Materials 1. Introduction On the international level, waste stabilisation/solidifi- cation (S/S) is carried out with two main objectives: . to treat wastes for admission to approved disposal centres, . to utilise wastes as materials in various matrices such as hydraulic binders. Although the reuse of waste material is quite tempt- ing, ecient assessment tools of the environmental behaviour have to be developed in order to prevent any misuse of this technology. It is particularly necessary to verify if the pollutant release from waste used in speci- fied conditions is compatible with the environment [1]. Among the assessment tools considered, the long-term 0956-053X/00/$ - see front matter # 2000 Elsevier Science Ltd. All rights reserved. PII: S0956-053X(00)00032-5 Waste Management 20 (2000) 741–750 www.elsevier.nl/locate/wasman * Corresponding author at second address. Tel.: +33-472-438386; fax: +33-472-439866. E-mail address: Radu.Barna@insa- lyon.fr (R. Barna).
Environmental behaviour of a construction made of a mixture of hydraulic binders and air pollution control residues from municipal solid waste incineration Part 1. Physico-chemical
May 05, 2023
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