Special Issue "Transitioning to a Circular Economy with Sustainable Waste Management"

A special issue of Sustainability (ISSN 2071-1050).

Deadline for manuscript submissions: 30 April 2021.

Special Issue Editor

Prof. Dr. Hiroshan Hettiarachchi
Website
Guest Editor
(formerly at) United Nations University (UNU-FLORES), 01067 Dresden, Germany
Interests: sustainability; circular economy; waste management; water recycling; environmental engineering; geotechnical engineering

Special Issue Information

Dear Colleagues,

Waste management often requires a landfill to bury waste or an incinerator to burn it. These are perhaps the most well-organized waste management options available today, if the objective is just to “manage”. However, burying and burning are certainly not sustainable options. Going one step further to design the same landfill to capture methane (bioreactor landfill) or the same incinerator to make energy (waste-to-energy), can make the process of waste management address all aspects of sustainability: the environment, the economy, and society. This would also provide socioeconomic benefits such as income creation, in addition to safeguarding the environment and public health. Examples go beyond energy, as there is much more that we already recover like paper, plastics, glass, etc. and even the organic fraction that contributes to nutrient recycling through composting.

In addition to all of the above, recycling and recovery can play an important role in the way we manage our natural resources: the more we recycle/recover, the less we must borrow from our limited natural resources. As shown in Figure 1, sustainable waste management has a large, yet untapped, potential to make our economy circular. This is particularly important with the rising demand in production to cater to the increasing population and the changing consumption habits. Unfortunately, the amounts we recycle/recover on a global scale, as of now, is very low. Not only is it low but it also has a decreasing trend currently: the circularity of the global economy has decreased from 9% in 2018 to 8.6% in 2020 [2, 3]. Sustainable waste management has improved a lot over the past 30–40 years. However, these numbers suggest that there is much more to be achieved. While science and engineering can help with technological solutions, their implementation depends heavily on contributions from the socioeconomic disciplines.

In this context, this Special Issue is particularly interested in capturing how sustainable waste management can be used to expedite our transition to a circular economy. You are invited to contribute with new technologies, their implementation, policy analysis/adaptation (including the Sustainable Development Goals), socioeconomic aspects, and, most importantly, case studies that cover one or combination of topics. While the main emphasis is on solid waste, circular economy applications arising from water recycling are also welcome.

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Figure 1. The material flow in the current economy that is only 9% circular [1].

References:

  1. Hettiarachchi, H. The Peak of Sustainable Waste Management Assures the Sustainability of Natural Resources, But Only in a Circular Economy. In Proceedings of the International Conference on Sustainability of Natural Resources, Qassim, Saudi Arabia, 5–6 November 2019. https://www.researchgate.net/publication/338867880_The_Peak_of_Sustainable_Waste_
    Management_Assures_the_Sustainability_of_Natural_Resources_But_Only_in_a_Circular_Economy
  2. Circle Economy. The Circularity Gap Report 2018; Circle Economy, 2018. https://www.circle-economy.com/insights/the-circularity-gap-report-our-world-is-only-9-circular
  3. Circle Economy. The Circularity Gap Report 2020; Circle Economy, 2020. https://www.circularity-gap.world/2020

Prof. Dr. Hiroshan Hettiarachchi
Guest Editor

Manuscript Submission Information

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Keywords

  • sustainability
  • waste management
  • environmental resources
  • circular economy
  • waste policy
  • recycling and recovery
  • sustainable development goals

Published Papers (1 paper)

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Research

Open AccessArticle
Upcycling Potential of Industrial Waste in Soil Stabilization: Use of Kiln Dust and Fly Ash to Improve Weak Pavement Subgrades Encountered in Michigan, USA
Sustainability 2020, 12(17), 7226; https://doi.org/10.3390/su12177226 - 03 Sep 2020
Abstract
The State of Michigan in the United States often encounters weak soil subgrades during its road construction and maintenance activities. Undercutting has been the usual solution, while a very few attempts of in-situ soil stabilization with cement or lime have been made. Compared [...] Read more.
The State of Michigan in the United States often encounters weak soil subgrades during its road construction and maintenance activities. Undercutting has been the usual solution, while a very few attempts of in-situ soil stabilization with cement or lime have been made. Compared to the large volume of weak soils that require improvement and the cost incurred on an annual basis, some locally available industrial byproducts present the potential to become effective soil subgrade stabilizers and a better solution from the sustainability perspective as well. The candidate industrial byproducts are Cement Kiln Dust (CKD), Lime Kiln Dust (LKD), and Fly Ash (FA), out of which only a fraction is currently used for any other secondary purposes while the rest is disposed of in Michigan landfills. This manuscript describes a laboratory investigation conducted on above industrial byproducts and/or their combinations to assess their suitability to be used as soil subgrade stabilizers in three selected weak soil types often found in Michigan. Results reveal that CKD or a combination of FA/LKD can be recommended for the long-term soil subgrade stabilization of all three soil types tested, while FA and LKD can be used in some soil types as a short-term soil stabilizer (for construction facilitation). A brief discussion is also presented at the end on the potential positive impact that can be made by the upcycling of CKD/LKD/FA on sustainability. Full article
(This article belongs to the Special Issue Transitioning to a Circular Economy with Sustainable Waste Management)
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