The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Stefanie Hellweg - One of the best experts on this subject based on the ideXlab platform.

  • An LCA model for waste incineration enhanced with new technologies for Metal Recovery and application to the case of Switzerland
    Waste Management, 2014
    Co-Authors: Michael E. Boesch, Dominik Saner, Christoph Huter, Carl Vadenbo, Stefanie Hellweg
    Abstract:

    A process model of municipal solid waste incinerators (MSWIs) and new technologies for Metal Recovery from combustion residues was developed. The environmental impact is modeled as a function of waste composition as well as waste treatment and material Recovery technologies. The model includes combustion with a grate incinerator, several flue gas treatment technologies, electricity and steam production from waste heat Recovery, Metal Recovery from slag and fly ash, and landfilling of residues and can be tailored to specific plants and sites (software tools can be downloaded free of charge). Application of the model to Switzerland shows that the treatment of one tonne of municipal solid waste results on average in 425kg CO2-eq. generated in the incineration process, and 54kg CO2-eq. accrue in upstream processes such as waste transport and the production of operating materials. Downstream processes, i.e. residue disposal, generates 5kg CO2-eq. Savings from energy Recovery are in the range of 67 to 752kg CO2-eq. depending on the assumptions regarding the substituted energy production, while the Recovery of Metals from slag and fly ash currently results in a net saving of approximately 35kg CO2-eq. A similar impact pattern is observed when assessing the MSWI model for aggregated environmental impacts (ReCiPe) and for non-renewable resource consumption (cumulative exergy demand), except that direct emissions have less and no relevance, respectively, on the total score. The study illustrates that MSWI plants can be an important element of industrial ecology as they provide waste disposal services and can help to close material and energetic cycles. © 2013 Elsevier Ltd.

  • An LCA model for waste incineration enhanced with new technologies for Metal Recovery and application to the case of Switzerland
    Waste Management, 2013
    Co-Authors: Michael E. Boesch, Dominik Saner, Christoph Huter, Carl Vadenbo, Stefanie Hellweg
    Abstract:

    A process model of municipal solid waste incinerators (MSWIs) and new technologies for Metal Recovery from combustion residues was developed. The environmental impact is modeled as a function of waste composition as well as waste treatment and material Recovery technologies. The model includes combustion with a grate incinerator, several flue gas treatment technologies, electricity and steam production from waste heat Recovery, Metal Recovery from slag and fly ash, and landfilling of residues and can be tailored to specific plants and sites (software tools can be downloaded free of charge). Application of the model to Switzerland shows that the treatment of one tonne of municipal solid waste results on average in 425 kg CO2-eq. generated in the incineration process, and 54 kg CO2-eq. accrue in upstream processes such as waste transport and the production of operating materials. Downstream processes, i.e. residue disposal, generates 5 kg CO2-eq. Savings from energy Recovery are in the range of 67 to 752 kg CO2-eq. depending on the assumptions regarding the substituted energy production, while the Recovery of Metals from slag and fly ash currently results in a net saving of approximately 35 kg CO2-eq. A similar impact pattern is observed when assessing the MSWI model for aggregated environmental impacts (ReCiPe) and for non-renewable resource consumption (cumulative exergy demand), except that direct emissions have less and no relevance, respectively, on the total score. The study illustrates that MSWI plants can be an important element of industrial ecology as they provide waste disposal services and can help to close material and energetic cycles.

Gaoqing Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Recovery of Cu and Fe from Printed Circuit Board waste sludge by ultrasound: Evaluation of industrial application
    Journal of Cleaner Production, 2009
    Co-Authors: F C Xie, T T Cai, G Q Yuan, Fengchun Xie, Chuncheng Li, Tingting Cai, Z.y. Huang, Yang Ma, C.c. Li, Yanhong Ma, Zhiyuan Huang, Haiying Li, H. Y. Li, Gaoqing Yuan
    Abstract:

    The paper presents a novel cleaner process for Metal Recovery from the Printed Circuit Board (PCB) waste sludge by assistance of ultrasound. The process can effectively recover heavy Metals at low cost with high separation and Recovery efficiency, produce high quality products and also achieve zero waste discharge with operation at industrial scale. With the PCB waste sludge containing (wet content) 3.14-4.85% copper and 3.71-4.23% iron, copper Recovery efficiency of 95.2-97.5% and iron Recovery efficiency of 97.1-98.5% were achieved, while the purity of copper sulfate produced by the process was 98.0% and the produced ferric chloride had a satisfied quality for using as a coagulant material for the plant on-site wastewater treatment. The process had been successfully scaled up to the industrial scaled applications in a heavy Metal Recovery plant in city of Huizhou, China for more than two years. The novel cleaner heavy Metal Recovery process has a great prospect on the applications of resources Recovery and environmental protection practices. (C) 2009 Elsevier Ltd. All rights reserved.

Yongxiang Yang - One of the best experts on this subject based on the ideXlab platform.

  • REWAS 2013: Enabling Materials Resource Sustainability - Metal Recovery from Industrial Solid Waste-Contribution to Resource Sustainability
    REWAS 2013, 2013
    Co-Authors: Yongxiang Yang
    Abstract:

    Increased demand of Metals has driven the accelerated mining and Metallurgical production in recent years, causing fast depletion of primary Metals resources. On the contrary, the mining and Metallurgical industry generates large amount of solid residues and waste such as tailings, slags, flue dust and leach residues, with relative low valuable Metal contents. On the other hand, end-of-life (EoL) consumer products form another significant resources. The current technology and processes for primary Metals production are not readily applicable for direct Metals extraction from these waste materials, and special adaptation and tailor-made processes are required. In the present paper, various solid waste resources are reviewed, and current technologies and R&D trends are discussed. The recent research at author’s group is illustrated for providing potential solutions to future resource problems, including Metal Recovery from MSW incinerator bottom ashes, zinc Recovery from industrial ashes and residues, and rare earth Metals Recovery from EoL permanent magnets.

  • Metal Recovery from Industrial Solid Waste-Contribution to Resource Sustainability
    REWAS 2013 Enabling Materials Resource Sustainability, 2013
    Co-Authors: Yongxiang Yang
    Abstract:

    Increased demand of Metals has driven the accelerated mining and Metallurgical production in recent years, causing fast depletion of primary Metals resources. On the contrary, the mining and Metallurgical industry generates large amount of solid residues and waste such as tailings, slags, flue dust and leach residues, with relative low valuable Metal contents. On the other hand, endof-life (EoL) consumer products form another significant resources. The current technology and processes for primary Metals production are not readily applicable for direct Metals extraction from these waste materials, and special adaptation and tailor-made processes are required. In the present paper, various solid waste resources are reviewed, and current technologies and R&D trends are discussed. The recent research at author's group is illustrated for providing potential solutions to future resource problems, including Metal Recovery from MSW incinerator bottom ashes, zinc Recovery from industrial ashes and residues, and rare earth Metals Recovery from EoL permanent magnets. © 2013 The Minerals, Metals & Materials Society. All rights reserved.

Andrew J Hunt - One of the best experts on this subject based on the ideXlab platform.

Fraser J Stoddart - One of the best experts on this subject based on the ideXlab platform.

  • precious Metal Recovery from electronic waste by a porous porphyrin polymer
    Proceedings of the National Academy of Sciences of the United States of America, 2020
    Co-Authors: Yeongran Hong, Damien Thirion, Saravanan Subramanian, Hyuk Choi, Fraser J Stoddart, Cafer T Yavuz
    Abstract:

    Urban mining of precious Metals from electronic waste, such as printed circuit boards (PCB), is not yet feasible because of the lengthy isolation process, health risks, and environmental impact. Although porous polymers are particularly effective toward the capture of Metal contaminants, those with porphyrin linkers have not yet been considered for precious Metal Recovery, despite their potential. Here, we report a porous porphyrin polymer that captures precious Metals quantitatively from PCB leachate even in the presence of 63 elements from the Periodic Table. The nanoporous polymer is synthesized in two steps from widely available monomers without the need for costly catalysts and can be scaled up without loss of activity. Through a reductive capture mechanism, gold is recovered with 10 times the theoretical limit, reaching a record 1.62 g/g. With 99% uptake taking place in the first 30 min, the Metal adsorbed to the porous polymer can be desorbed rapidly and reused for repetitive batches. Density functional theory (DFT) calculations indicate that energetically favorable multinuclear-Au binding enhances adsorption as clusters, leading to rapid capture, while Pt capture remains predominantly at single porphyrin sites.