To avoid energy scarcity as well as climate change, a transition towards a sustainable society must be initiated. Within this context, governmental bodies and/or companies often note sustainability as an end goal, for instance as a green circular economy. However, if sustainability cannot be clearly defined as an end goal or measured uniformly and transparently, then the direction and progress towards this goal can only be roughly followed. A clear understanding of and a transparent, uniform measuring technique for sustainability are hence required for sustainable and circular (renewable) energy production pathways (REPPs), as society is asking for an integrated and understandable overview of the decision-making and planning process towards a future sustainable energy system. Therefore, within this dissertation, a new approach is proposed for measuring and optimizing the sustainability of REPPs; it is useful for the analysis, comparison, and optimization of REPP systems on all elements of sustainability. The new approach is applied and tested on a case based on farm-scale, anaerobic digestion (AD), biogas production pathways.
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Het hanteren en beheersen van specifieke productieprocessen heeft een positief effect op de efficiëntie waarmee bedrijven hun productie voeren en daarmee ook op hun concurrentiepositie. Dit geldt tevens voor de automobielindustrie en hun toeleveranciers. In diverse onderzoeken rondom het toepassen van productieproces optimalisatie is gekeken wat de effecten kunnen zijn voor specifieke bedrijven en wat dit voor het bedrijf betekent bij invoer van de voorgestelde optimalisatiestappen. Fontys Hogescholen nam deel aan een aantal projecten rondom dit thema. Dit artikel geeft een idee wat diverse productieprocessen inhouden en wat de effecten kunnen zijn voor grotere productiebedrijven. Het is geen verrassing dat het meest toonaangevende productie systeem afkomstig is van een wereldspeler op het gebied van automobiel productie, namelijk Toyota. Het door Toyota in de jaren ontwikkelde en constant verbeterde productie systeem is bekend geworden onder de naam TPS: Toyota Production System. De kern van de TPS is verwijdering van verspilling en absolute concentratie op consistent hoge kwaliteit door een proces van continue verbetering, Kaizen. Dit is een filosofie die er op gericht is om alles wat geen meerwaarde oplevert voor het bedrijf en waar de klant niet voor betaald te elimineren. Maar met de installatie van TPS, is het echte werk van de TPS pas begonnen. In de 'Toyota Way' zijn het de mensen die het systeem van werken, communiceren, problemen oplossen en groeien samen tot leven brengen. De 'Toyota Way' stimuleert, ondersteunt en vraagt in feite om betrokkenheid van alle betrokken werknemers. De 'Toyota Way' is ook lange termijn denken. De focus van de top van het bedrijf is het toevoegen van waarde aan klanten en de maatschappij. Dit stuurt een lange termijn benadering aan de opbouw van een lerende organisatie. De lering uit de onderzoeksverslagen en de stukken die geraadpleegd zijn voor de totstandkoming van dit artikel is dat er een ruime hoeveelheid informatie aanwezig is over de tools om TPS mogelijk te maken. Echter blijkt in veel gevallen dat voor het werkelijk doorvoeren van productieproces optimalisatie een omslag in de bedrijfscultuur nodig is in vrijwel alle lagen van de organisatie. Reflecterend lijkt dat een groot gedeelte van het TPS niet direct gekoppeld hoeft te zijn aan de procesindustrie waarin tastbare producten gemaakt worden. Het TPS en de Toyota Way zijn wellicht ook het lichtende voorbeeld voor onderwijsvernieuwing op het HBO.
A transparent and comparable understanding of the energy efficiency, carbon footprint, and environmental impacts of renewable resources are required in the decision making and planning process towards a more sustainable energy system. Therefore, a new approach is proposed for measuring the environmental sustainability of anaerobic digestion green gas production pathways. The approach is based on the industrial metabolism concept, and is expanded with three known methods. First, the Material Flow Analysis method is used to simulate the decentralized energy system. Second, the Material and Energy Flow Analysis method is used to determine the direct energy and material requirements. Finally, Life Cycle Analysis is used to calculate the indirect material and energy requirements, including the embodied energy of the components and required maintenance. Complexity will be handled through a modular approach, which allows for the simplification of the green gas production pathway while also allowing for easy modification in order to determine the environmental impacts for specific conditions and scenarios. Temporal dynamics will be introduced in the approach through the use of hourly intervals and yearly scenarios. The environmental sustainability of green gas production is expressed in (Process) Energy Returned on Energy Invested, Carbon Footprint, and EcoPoints. The proposed approach within this article can be used for generating and identifying sustainable solutions. By demanding a clear and structured Material and Energy Flow Analysis of the production pathway and clear expression for energy efficiency and environmental sustainability the analysis or model can become more transparent and therefore easier to interpret and compare. Hence, a clear ruler and measuring technique can aid in the decision making and planning process towards a more sustainable energy system.
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The production of denim makes a significant contribution to the environmental impact of the textile industry. The use of mechanically recycled fibers is proven to lower this environmental impact. MUD jeans produce denim using a mixture of virgin and mechanically recycled fibers and has the goal to produce denim with 100% post-consumer textile by 2020. However, denim fabric with 100% mechanically recycled fibers has insufficient mechanical properties. The goal of this project is to investigate the possibilities to increase the content of recycled post-consumer textile fibers in denim products using innovative recycling process technologies.
Recycling of plastics plays an important role to reach a climate neutral industry. To come to a sustainable circular use of materials, it is important that recycled plastics can be used for comparable (or ugraded) applications as their original use. QuinLyte innovated a material that can reach this goal. SmartAgain® is a material that is obtained by recycling of high-barrier multilayer films and which maintains its properties after mechanical recycling. It opens the door for many applications, of which the production of a scoliosis brace is a typical example from the medical field. Scoliosis is a sideways curvature of the spine and wearing an orthopedic brace is the common non-invasive treatment to reduce the likelihood of spinal fusion surgery later. The traditional way to make such brace is inaccurate, messy, time- and money-consuming. Because of its nearly unlimited design freedom, 3D FDM-printing is regarded as the ultimate sustainable technique for producing such brace. From a materials point of view, SmartAgain® has the good fit with the mechanical property requirements of scoliosis braces. However, its fast crystallization rate often plays against the FDM-printing process, for example can cause poor layer-layer adhesion. Only when this problem is solved, a reliable brace which is strong, tough, and light weight could be printed via FDM-printing. Zuyd University of Applied Science has, in close collaboration with Maastricht University, built thorough knowledge on tuning crystallization kinetics with the temperature development during printing, resulting in printed products with improved layer-layer adhesion. Because of this knowledge and experience on developing materials for 3D printing, QuinLyte contacted Zuyd to develop a strategy for printing a wearable scoliosis brace of SmartAgain®. In the future a range of other tailor-made products can be envisioned. Thus, the project is in line with the GoChem-themes: raw materials from recycling, 3D printing and upcycling.
Currently, many novel innovative materials and manufacturing methods are developed in order to help businesses for improving their performance, developing new products, and also implement more sustainability into their current processes. For this purpose, additive manufacturing (AM) technology has been very successful in the fabrication of complex shape products, that cannot be manufactured by conventional approaches, and also using novel high-performance materials with more sustainable aspects. The application of bioplastics and biopolymers is growing fast in the 3D printing industry. Since they are good alternatives to petrochemical products that have negative impacts on environments, therefore, many research studies have been exploring and developing new biopolymers and 3D printing techniques for the fabrication of fully biobased products. In particular, 3D printing of smart biopolymers has attracted much attention due to the specific functionalities of the fabricated products. They have a unique ability to recover their original shape from a significant plastic deformation when a particular stimulus, like temperature, is applied. Therefore, the application of smart biopolymers in the 3D printing process gives an additional dimension (time) to this technology, called four-dimensional (4D) printing, and it highlights the promise for further development of 4D printing in the design and fabrication of smart structures and products. This performance in combination with specific complex designs, such as sandwich structures, allows the production of for example impact-resistant, stress-absorber panels, lightweight products for sporting goods, automotive, or many other applications. In this study, an experimental approach will be applied to fabricate a suitable biopolymer with a shape memory behavior and also investigate the impact of design and operational parameters on the functionality of 4D printed sandwich structures, especially, stress absorption rate and shape recovery behavior.
