| 1. |
- Lindahl, Mattias, 1971-, et al.
(författare)
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Industrial cleaning with Qlean Water : a case study of printed circuit boards
- 2013
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Ingår i: Journal of Cleaner Production. - : Elsevier BV. - 0959-6526 .- 1879-1786. ; 47, s. 19-25
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Tidskriftsartikel (refereegranskat)abstract
- Many manufacturing companies are looking for ways to substitute environmentally problematic cleaning methods for surface treatments with more environmentally friendly ones. In this paper, one potential solution is described. The Qlean method, based on cleaning with highly pure water (in this paper defined as Qlean Water), is a novel cleaning method. This method, now utilized at one plant at a leading major international electronic company, has substituted previous chemical-based methods for cleaning printed circuit boards prior to lacquering. This paper presents, based on that company's primary data, a comparative study using environmental analysis and economic life cycle cost review between cleaning with Qlean Water and conventional cleaning. The focus is on the environmental and economic performance of the two alternatives. The conclusion is that Qlean Water offers both a significant economic and environmental cost reduction and a better product. This is the case even though all identified economic benefits derived from using Qlean Water, e.g. that the quality and technical lifetime have been extended for the printed circuit boards with the Qlean Water cleaning method, are not considered in the economic analysis.
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| 2. |
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| 3. |
- Sundin, Erik, 1974-, et al.
(författare)
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Innovation Potentials of Using Solvent-free Industrial Cleaning in Swedish Manufacturing Industry
- 2008
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Ingår i: Proceedings of Sustainable Innovation 08 - Future products, technologies and industries.
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Konferensbidrag (refereegranskat)abstract
- In this research collaboration project between SMEs and academia a new way of cleaning machine parts have been developed. The cleaning company Servicestaden and researchers at Linköping University have discovered new ways of cleaning without the use of solvents. In the research project called ‘Solvent-Free Industrial Cleaning’ (SOFIQ) it has been found that cleaning with the SOFIQ-technology is more environmentally sound than with traditional cleaning techniques. However, there is a major challenge to keep up the pace of cleaning within manufacturing since it often have high demands of short lead times. This is a challenge that will be constraining the use of the method.
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| 4. |
- Sundin, Erik, 1974-, et al.
(författare)
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Solvent-free Industrial Cleaning of Printed Circuit Boards
- 2009
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Ingår i: Proceedings of EcoDesign 2009, Sapporo, Japan. - 9784888981927 ; , s. 823-828
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Konferensbidrag (refereegranskat)abstract
- The manufacturing industry today uses different kinds of chemicals in its cleaning processes. The industrial cleaners often contain some sort of degreasing chemical to clean parts and components before for instance sur-face treatment processes. These types of cleaning meth-ods imply expensive and dangerous handling of chemi-cals in the manufacturing process, as well as in the transportation of hazardous waste. Furthermore, the cleaning processes also use a substantial amount of en-ergy for cleaning.The aim of this paper is to explore the potential of how ultra-clean water cleaning can be used in the manufac-turing industry. In order to meet the aim, a case study was conducted at a electronic manufacturer. The data for this research was collected mainly through interviews, but also by industrial study visits.The results from this research show that using solvent-free industrial cleaning with ultra-clean water is benefi-cial from the perspectives of quality, environment and business. The quality improvement is the most important benefit that the electronic manufacturer can see by using solvent-free industrial cleaning for their printed circuit boards.
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| 5. |
- Svensson, Niclas, 1974-, et al.
(författare)
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Industrial Cleaning with ultra-clean water according to the Qlean-method – a case study of printed circuit boards
- 2011
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The manufacturing industry today uses many kinds of chemicals in its cleaning processes. The industrial cleaners often contain some sort of degreasing chemical to clean parts and components before the main processes, for instance assembly or surface treatment. These types of cleaning methods are often expensive and involve hazardous handling of chemicals in manufacturing, as well as in the transportation of hazardous waste. In addition, the cleaning processes often use a substantial amount of energy for cleaning. The aim of this paper is to explore how ultra-clean water cleaning, using a method called Qlean, can be applied in the manufacturing industry. In order to meet this aim, a case study was conducted at Flextronics, in Karlskrona, Sweden. The data for this research was collected through interviews and functional tests at different industries, which then was analysed further. The results from this research show that using solvent-free industrial cleaning with ultra-clean water is beneficial from the perspectives of quality, environment and business. The quality improvement derived from using solvent-free industrial cleaning in the case of cleaning printed circuit boards was the most important benefit.
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| 6. |
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| 7. |
- Bergman, Filip, 1992-, et al.
(författare)
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A Critical Review of the Sustainability of Multi-Utility Tunnels for Colocation of Subsurface Infrastructure
- 2022
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Ingår i: Frontiers in Sustainable Cities. - : Frontiers Media S.A.. - 2624-9634. ; 4
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Forskningsöversikt (refereegranskat)abstract
- Multi-utility tunnel (MUT) have received increasing attention as an alternative method for installing subsurface infrastructure for the distribution of electricity, telecommunications, water, sewage and district heating. MUTs are described as a potentially more sustainable technology than conventional open-cut excavation (OCE), especially if the entire life cycle of these cable and pipe networks is taken into account. Based on an extensive review of the academic literature, this article aims to identify and critically examine claims made about the pros and cons of using MUT for the placement of subsurface infrastructure. Identified claims are mapped, and their validity and applicability assessed. These claims are then analyzed from a sustainability perspective, based on the three sustainability dimensions and a life cycle perspective. The results show that a variety of advantages and disadvantages of using MUTs for subsurface infrastructure are highlighted by the articles, but several of these are without any empirical support. When some form of empirical support is presented, it usually comes from case-specific analyses of MUTs, and the applicability in other MUT projects is seldom discussed. Economic performance is the sustainability dimension that has received the most attention, while environmental performance has not been analyzed in the reviewed literature, which is a major limitation of the current knowledge. In summary, the knowledge about the sustainability performance of using MUTs for subsurface infrastructure is still limited and incoherent. In order to increase the knowledge, this article points out the importance of new case studies, in which the sustainability consequences of using MUTs for subsurface infrastructure are mapped and evaluated by combining both quantitative and qualitative assessment methods.
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| 8. |
- Bergman, Filip, 1992-
(författare)
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Sustainability performance of multi-utility tunnels : Sustainability assessments for furthering knowledge and understanding
- 2022
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The multi-utility tunnel has received increased attention as an alternative method for the installation of subsurface infrastructure for the distribution of electricity, water, sewage and district heating. In previous research, the multi-utility tunnel (MUT) has been described as a more sustainable technology compared to the conventionally used technique where the cables and pipes are placed with open-cut excavation (OCE), especially when the entire life cycle is taken into account. This thesis aims to contribute to an improved understanding of MUT's sustainability performance in relation to conventional installation using open-cut excavation. This is done by using literature study, interview study and quantitative sustainability assessments to gain an understanding of the current state of knowledge. Furthermore, this thesis also focuses on how knowledge can be deepened with the help of quantitative sustainability assessments and the challenges of conducting this type of assessment. This thesis shows that the state of knowledge regarding MUT's sustainability performance is low and scattered, with a lack of a holistic approach. Direct economic performance has gained the most attention, followed by indirect and social impact, and the environmental impact has so far barely been assessed. The sustainability performance depends to a large extent on the conditions of the specific case, and these should be considered when assessing the technology. Quantitative assessments have the potential to help deepen the knowledge of the sustainability implications of using MUT. The characteristics of MUT have some similarities with other types of physical infrastructure. Similarities are that the systems are long-lived, have project conditions that affect sustainability performance, and impact a broad spectrum of actors. One difference to typical infrastructure systems is that the owner and management structure of MUT is, by design, more complex as several types of utility systems are in use. The characteristics of MUT give some practical considerations that need to be addressed: data availability, including practitioners; detailed data; transparency; and flexibility. This thesis highlights the complexity of assessing MUT´s sustainability performance and advocates that future studies should have a learning-oriented approach so that the knowledge level can collectively and gradually improve over time rather than focusing on decision-oriented studies.
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| 9. |
- Cordova, Stephanie S., 1988-
(författare)
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Utilizing CO2 from biomethane production : Sustainability and climate performance
- 2023
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Biogas solutions offer many benefits for the environment and society, including organic waste treatment as well as being an enabler for energy and nutrient recovery. The products of anaerobic digestion are a biogas, which contains a share of 30 to 50% carbon dioxide (CO2) and 50 to 70% methane, and a liquid remanent, rich in nutrients. The biogas can be upgraded by removing the CO2 to increase the energy content, producing biomethane. At present, CO2 is considered a waste in biomethane production systems, and hence it is emitted into the atmosphere. Nevertheless, biogas upgrading technologies separate a pure-grade CO2 and, likewise, carbon capture processes, providing a pure CO2 flow that can be stored or utilized. Compared to storage, carbon capture and utilization (CCU) technologies deliver valuable carbon-based products required to sustain human activities. The valorization of green CO2 could aid the transition towards defossilization of the economy. Indeed, several CO2 utilization technologies could be incorporated into biomethane production systems, but there is still a limited understanding of the available alternatives and their potential impacts on biomethane systems.This thesis aims to investigate the integration of CO2 utilization technologies in biomethane production systems by revealing its potential, identifying alternatives, and assessing the impacts of the integration. Using Sweden as an example, scenarios of future biomethane production were employed to estimate the potential CO2 available for utilization. To complement the analysis, a qualitative approach made possible the identification of aspects that could affect CO2 utilization in biomethane production. Moreover, a multi-criteria analysis (MCA) framework was developed to identify relevant indicators for assessment and available alternatives for CO2 utilization. The research also includes a life cycle assessment (LCA) to evaluate the climate performance of relevant CCU alternatives in the biomethane production system.Results show that 160 kt of CO2 could be obtained from biomethane production in Sweden, which could potentially increase threefold from 2020 to 2030. The evaluation of alternatives for CO2 utilization includes environmental, technical, economic, and social criteria with sound indicators within an MCA framework. Indicators to evaluate each criterion provide valuable information to identify feasible and sustainable alternatives that can be integrated into biomethane plants. The identified alternatives with a high readiness level are additional methane through methanation, horticulture, mineral carbonates, fuels, pH control, bulk chemicals, and liquefied CO2 for direct use. The results provide information to decision-makers in relation to considerations to take before implementation, like energy requirements, the existence of regulations and standards, and uncertainty. In terms of the climate performance of biomethane with the inclusion of CCU alternatives, the results show a possible reduction of CO2 emissions that depends on the possibility of substituting fossil-based products. The investigated alternatives all result in lower emissions, but concrete curing and methanation using renewable hydrogen produce the best results.To conclude, the potential future increase of green CO2 from biomethane in Sweden creates opportunities to substitute fossil carbon in current applications and mature conversion pathways. Moreover, the inclusion of CCU in biomethane production contributes to reducing biomethane system emissions and diversifying its products. Possible alternatives of CCU that can be integrated into biomethane production systems in the short term include methanation and concrete curing. Other alternatives could be possible but present lower performance and higher uncertainties at the moment.
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| 10. |
- Cordova, Stephanie, 1988-, et al.
(författare)
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What should we do with CO₂ from biogas upgrading?
- 2023
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Ingår i: Journal of CO2 Utilization. - : Elsevier. - 2212-9820 .- 2212-9839. ; 77
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Tidskriftsartikel (refereegranskat)abstract
- Carbon capture and utilization has been proposed as an essential climate change mitigation strategy, but only a few implemented cases exist. During biomethane production from anaerobic digestion, CO₂ is commonly separated and emitted into the atmosphere, which can be utilized as raw material for various products. This research aims to identify and assess CO₂ utilization alternatives for possible integration with biogas upgrading from anaerobic digestion by developing a soft multi-criteria analysis (MCA). A literature review complemented with stakeholder participation enabled the identification of relevant alternatives and criteria for assessment. Potential alternatives for CO₂ utilization include methane, mineral carbonates, biomass production, fuels, chemicals, pH control, and liquefied CO₂. Results show that although no alternative performs well in all indicators, there is an opportunity for short-term implementation for methane, biomass production, mineral carbonates, liquefied CO₂, and pH control. Moreover, the uncertainty analysis reveals that even though the technologies have a high technological development, more information on critical aspects is still required. The soft MCA provides information to decision-makers, practitioners, and the academic community on learning opportunities of the alternatives and indicators to step from development into implementation. For instance, the method can be used to assess more specific systems with different locations and scales or to direct efforts to ease the implementation of CCU.
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