Integrated planning of electronic scrap disassembly and bulk recycling

Abstract

The development of cost-eflcient recove y concepts for discarded electronic products can be supported by the detailed analysis of material flows. This paper presents a sophisticated operations research model for integrated disassembly and bulk recycling planning problems. In a project that was carried out with a major German electronic scrap recycling enterprise, the daily program of recovered products and recove y operations had to be determined by a cost-efficient recycling program. The program takes into account the restrictions given by personnel, unit and market capacities including the consideration of the following problems:What discarded products should be chosen for treatment?What level of disassembly should be chosen? Which scrap types should be treated in the internal bulk recycling facilities? What should be marketed externally? Based on the analysis of the materialflows throughout the recycling enterprise regarding acquisition, disassembly and bulk recycling, a mixed-integer-linear-programming (MILP) model for integrated disassembly and bulk recycling planning problems has been developed, implemented and solved. As a conclusion, the innovative model provides practicable decision support for integrated recovery facilities. Compared with basic programs, an improvement of at least 10% concerning the total achievable marginal income can be obtained. INTRODUCTIONThe development of cost-efficient recovery concepts for discarded products can be supported by the application of sophisticated operations research models. This paper refers to the tasks supply, disassembly and bulk recycling of a major electronic scrap recycling enterprise that recovers industrial and consumer electronics. In the enterprise, the recovery process is divided into disassembly in order to remove harmfid substances or reusable parts and into bulk recycling in order to gain ferrous and non-ferrous metals through size-reduction and separation steps. The recent

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“…The simulation-based model: Ploog and Spengler (2002) assumed the electronic products recovery mode and developed a mathematical model with an application involving lingo procedures. The raw materials management model was built by Tserng, Yin and Li (2006), this model described its objectives and constraints, and subsequently simulations were carried out based on Visual Basic 6.0 and Microsoft SQL, discovering that the structure of supply chain inventory cost is mostly affected by the total inventory cost.…”

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“…A sophisticated operations research model was offered by Ploog and Spengler (2002) for integrated disassembly and bulk-recycling planning; it included mixed-integer nonlinear programming. The authors tried to resolve questions such as the following: What discarded products should be chosen for treatment?…”