Oral Presentation World Sustainable Built Environment Conference 2026

Pathways to repurpose Soil-Like Material(SLM) from mined dumpsites (132239)

Disha Arora 1 , Patricia Schneider-Marin 1 , Kevin Matar 2
  1. Department of Architecture and Technology, Norwegian University of Science and Technology, Trondheim, Norway
  2. Institute for Advanced Architecture of Catalonia, Barcelona, Spain

Due to urbanization in the past decades, the accumulation of large quantities of solid waste has resulted in open dumpsites in many countries, occupying tens of acres of land and reaching heights over 50 meters. These dumpsites contain millions of tons of legacy waste, posing significant environmental threats to the nearby settlements of waste pickers, including the emission of foul odors and gases, leachate, fires, and groundwater contamination. An opportunity to reduce the volumes of these waste dumps is landfill mining. Additionally, 18 % of global methane emissions can be mitigated by responsibly managing waste. However, landfill mining creates polluted land, and more than 60% of it is the toxic and disused ‘soil-like material’ (SLM), which has adverse effects on the environment, society and the economy. The research aims to assess the feasibility of the various remediation and use pathways for SLM. A range of remediation methods applied to SLM are compiled from literature and comparatively evaluated, with their respective GHG emissions quantified in a life cycle assessment, and economic and social implications qualitatively assessed. Thereafter, a set of potential pathways is established, outlining how SLM can be integrated into the built environment at various stages of its remediation lifecycle.  Phytoremediation emerges as the most cost-effective method, having the least GHG emissions to decontaminate SLM on an urban scale. However, it is the most time-consuming method and results in toxic biomass. Solidification is found to be the least time-consuming method, enabling the immediate use of SLM; however, it remains limited to small-scale use and poses the dangers of leaching. The outcome of the research aids the different stakeholders in achieving an overall regeneration of mined dumpsites, enabling them to make informed decisions for managing SLM. Future research is directed towards evaluation further environmental impacts, also from the resulting toxic waste.