Reassessing tin circularity and criticality

Tin is an important metal for society with a high risk of supply disruptions. It is, therefore, classified as a critical material in many parts of the world. An exception is the European Union, for which tin was classified as a non-critical material in 2023. However, there are many discrepancies in the literature regarding the definitions and...

A bottom-up ontology-based approach to monitor circular economy: Aligning user expectations, tools, data and theory

With circular economy being high on governmental agendas, there is an increasing request from governing bodies for circularity measurements. Yet, currently existing macro-level monitoring frameworks are widely criticized for not being able to inform the decision-making. The criticism includes, among others, a lack of consensus on...

Characterizing IT asset disposition flows for the circular economy: A case study on export for reuse from Ireland

Understanding flows of resource-rich electrical and electronic equipment throughout its life cycle is increasingly important in the development of global circular economies, reflected by heavy legislative focuses on waste prevention and resource use efficiency. This research facilitates broader material flow analysis by characterizing flows...

Toward a low-carbon and circular building sector: Building strategies and urbanization pathways for the Netherlands

Buildings are an important part of society's environmental impacts, both in the construction and in the use phase. As the energy performance of buildings improve, construction materials become more important as a cause of environmental impact. Less attention has been given to those materials. We explore, as an alternative for conventional...

Material intensity database for the Dutch building stock: Towards Big Data in material stock analysis

Re-use and recycling in the construction sector is essential to keep resource use in check. Data availability about the material contents of buildings is significant challenge for planning future re-use potentials. Compiling material intensity (MI) data is time and resource intensive. Often studies end up with only a handful of datapoints. In...

Towards an environmentally sound metric to evaluate post-consumer plastic packaging waste recycling: Towards an environmentally sound metric to evaluate post-consumer plastic packaging waste recycling

In the recent years, the circular economy (CE) has emerged as an alternative to current linear economic models with prospects of achieving the decoupling of environmental impacts from economic growth. To this end, CE models focus on the permanence of products, materials, and value in the economy, eliminating as much waste as possible. In waste...

Phosphorus recycling in the Dutch communal wastewater chain: Barriers to growth

The goal of this research is to identify barriers that hinder the development of phosphorus (P)<br/>recycling by the communal water chain. Insights into these barriers can lead to a better<br/>understanding of the situation and can lead to possible solutions to overcome the obstacles. The research shows that P recycling is a complex field with...

Mapping stocks and flows of neodymium: An assessment of neodymium production and consumption in the Netherlands in 2010 and 2030

The Master's programme Industrial Ecology is jointly organised by Leiden University and Delft University of Technology. Neodymium applications, especially the neodymium-iron-boron (NdFeB) permanent magnet, have substantially enabled continuous miniaturization in the electronics sector and have become increasingly vital to electric mobility and...

Circular economy in the City of the Loops: Modelling an urban utopia aware of resources scarcity

The master thesis treats the possibilities of applying circular economy principles into specific conditions of post-soviet city: Nowa Huta. The city faces complex problems of negative demographics, loss of heavy industry and socio-economic regress. The project proposes several strategies that focuses on dealing with problems internally, without...