1,720,987 research outputs found
Editorial: Industrial networks for resource efficiency
No full textWasted materials represent valuable resources that we can no longer afford to discard. The concept of ‘zero waste’ is a challenge to old ways of thinking, calling for waste to be viewed as a potential resource with value to be realised, rather than as a problem to be dealt with, usually by burial in landfill sites or incineration without energy recovery. Examples of industrial symbiosis – the theoretical rationale and methods for sharing information and resources across different industries – are starting to be found worldwide. In this themed issue, we focus on technological issues. A short overview of the themes that are discussed in detail in the individual papers is given below. The key concepts of the Zerowin vision (outlined in the briefing by den Boer et al. (2014)) formed the foundation of the demonstration case studies presented in this journal
HydroWEEE project: Design and construction of a mobile demonstration plant
No full textThe objective of this chapter is to describe a mobile demonstration plant for the recovery of metals from waste electrical and electronic equipment and other waste such as spent batteries and exhausted industrial catalysts. The plant was designed within the European FP7 framework HydroWEEE demo (2012-16) and can offer an effective proposal to addressing the problem of electronic waste, reducing the environmental impact of their incorrect disposal, recovering critical materials such as rare earths and precious elements, and giving economic benefits
An advanced study on the hydrometallurgical processing of waste computer printed circuit boards to extract their valuable content of metals
No full textThis study refers to two chemical leaching systems for the base and precious metals extraction from waste printed circuit boards (WPCBs); sulfuric acid with hydrogen peroxide have been used for the first group of metals, meantime thiourea with the ferric ion in sulfuric acid medium were employed for the second one. The cementation process with zinc, copper and iron metal powders was attempted for solutions purification. The effects of hydrogen peroxide volume in rapport with sulfuric acid concentration and temperature were evaluated for oxidative leaching process. 2M H2SO4 (98% w/v), 5% H2O2, 25°C, 1/10 S/L ratio and 200rpm were founded as optimal conditions for Cu extraction. Thiourea acid leaching process, performed on the solid filtrate obtained after three oxidative leaching steps, was carried out with 20g/L of CS(NH2)2, 6g/L of Fe3+, 0.5M H2SO4, The cross-leaching method was applied by reusing of thiourea liquid suspension and immersing 5g/L of this reagent for each other experiment material of leaching. This procedure has lead to the doubling and, respectively, tripling, of gold and silver concentrations into solution. These results reveal a very efficient, promising and environmental friendly method for WPCBs processing
Environmental impact assessment of hydrometallurgical processes for metal recovery from WEEEs
No full textEditorial: Industrial networks for resource efficiency
Full text linkWasted materials represent valuable resources that we can no longer afford to discard. The concept of ‘zero waste’ is a challenge to old ways of thinking, calling for waste to be viewed as a potential resource with value to be realised, rather than as a problem to be dealt with, usually by burial in landfill sites or incineration without energy recovery. Examples of industrial symbiosis – the theoretical rationale and methods for sharing information and resources across different industries – are starting to be found worldwide. In this second themed issue of Waste and Resource Management, the results of an FP7 Collaborative Project, ‘Towards zero waste in industrial networks’ (Zerowin), which has demonstrated for the first time successful implementation of ten European Industrial Network case studies, are presented. In this themed issue, we focus on the construction and demolition and automotive sectors. A short overview of the themes which are discussed in detail in the individual papers is given here below. The key concepts of the Zerowin vision (outlined in the first themed issue) formed the foundation of the demonstration case studies presented in this issue
Environmental impact assessment of hydrometallurgical processes for metal recovery from WEEEs
No full textCapabilities required to tackle barriers to remanufacturing
No full textThe transition towards a circular economy proposes to deliver sustainable, lower carbon opportunities to society, governments and companies. This paper focuses on finding barriers encountered during remanufacturing activities and interpreting the barriers by using a framework for dynamic capabilities. Dynamic capabilities enable companies to adjust to changes in their business activities. In the literature, remanufacturing is described as a process to restore used products to a ‘as good as new’ condition, through a series of steps. This paper discusses the analysis of in-depth interviews with a selection of five remanufacturing companies. The companies are from the following sectors: automotive, IT, photocopiers, industrial robots and building components. Results show they have a tendency to put technical capabilities at the core of their research, leaving ‘softer’ capabilities, such as sensing and learning, less developed.Circular Product DesignClimate Design and Sustainabilit
Briefing: demonstrating the circular resource economy – the ZeroWIN approach
No full textZerowin is an ambitious European Union funded project researching and trialling methods and strategies to eliminate the wasteful consumption of resources in key industrial sectors in Europe, primarily by way of the formation of industrial networks. The project has run from 2009 to 2014. This paper reports on the completion of the project, which through demonstration activities has shown that society can solve its current industrial pollution and resource problems in a sustainable way if it is willing to change its business practices and culture
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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