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The worldwide recycled aluminum generation is increasing quickly thanks to the environmental considerations and continuous growing of use demands. Aluminum dross recycling, as the secondary aluminum process, has been always considered as a problematic issue in the world. The aim of this work is to propose a methodical and easy procedure for the proposed system selection as the MCDM problem. Here, an evaluation method, integrated FAHP, is presented to evaluate aluminum waste management systems. Therefore, we drive weights of each pair comparison matrix by the use of the goal programming (GP) model. The functional unit includes aluminum dross and aluminum scrap, which is defined as 1000 kilograms. The model is confirmed in the case of aluminum waste management in Arak. For the proposed integrated fuzzy AHP model, five alternatives are investigated. The results showed that, according to the selected attributes, the best waste management alternative is the one involving the primary aluminum ingot 99.5% including 200 kg and the secondary aluminum 98% (scrap) including 800 kg, and beneficiation activities are implemented, duplicate aluminum dross is recycled in the plant, and finally it is landfilled.

Abstract. The aim of this study is to compare the potential environmental impacts of three kinds of aluminum: primary aluminum ingot (A), secondary aluminum ingot (B) and to mix aluminum ingot (C) with each other. For this purpose, the life cycle assessment model is developed based on damageoriented approach. For each unit process, the reference flow is 500 kg. The results show that model "A" has the highest impacts in all categories, model "B" is intermediate and the model "B" is the most environmentally friendly process. As a surprising result model "B" has the highest amount for fluoride, BTEX and VOC compared with the models "A" and "C" as air emission. Finally with regard to all aspects, model "B" or mixed aluminum is selected as the preferable option. The most important reasons for this selection are energy savings, low refining required and low demand for specially landfill operation with regarding Iran as a developing country. Also we examine further this subject by applying the Entropy and ELECTRE methods.

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