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The scarcity of ore and environmental intensity of copper production creates a strong incentive to explore alternative materials for conducting electricity. Single-walled carbon nanotubes (SWCNT) rely on plentiful feedstock materials (i.e., graphite) and exhibit high theoretical conductivity on a per mass basis. However, bulk conductivities measured at the laboratory scale indicate further improvements...
The metals contained in various mobile phones were analyzed. More than 20 elements were detected and their net amounts were found to increase year by year. The environmental and economic impacts were assessed based on an elemental analysis. The CO2 emissions generated by the incineration of plastics were estimated to be almost the same as those avoided by recovering the metals. Gold had the biggest...
This paper uses economic value metrics to evaluate the retention of value of secondary materials and provides a framework for characterizing value throughout a material and product life-cycle. These economic value metrics are compared with analogous life cycle assessment metrics in order to determine the conditions under which economic value effectively represents environmental impact for EoL material...
What does it take to sustain a civilization in an environment where emerging technologies can have a progressive or disruptive effect-or both at the same time? One way of approaching this question from a social-psychological standpoint is to use games or simulations that allow participants to experiment, making decisions about sustaining or transforming civilizations. this presentation will discuss...
This paper assesses the forward and reverse supply chain of computers in developing countries by using Peru as a case study. The aim is to develop more sustainable post-consumer management. The Peruvian forward supply chain of non-mobile personal computers (nmPCs) is a combination of domestically assembled, imported new and imported used machines, with estimated shares of 70, 18 and 12 percent, respectively.
Microbiological processes were applied to mobilize metals from printed wire boards. Acidithiobacillusferrooxidans isolated from a acidic mine drainage was grown and acclimated in the presence of printed wire boards and then used as bioleaching bacteria to solubilize metals from scraps of printed wire boards. Two Face Copper Clad Laminate (TFCCL), TFCCL with green non-conductive coating and actual...
As the amount of waste printed circuit boards (PCBs) increases dramatically, methods to recycle them become increasingly important not only for economic reasons but also for environmental ones. PCB recycling methods include mechanical, pyrometallurgical, hydrometallurgical and biometallurgical processes. By comparing the different technologies available for PCB recycling, we aim to discover the limitations...
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