scholarly journals Closed-Loop Recycling of Polymers Using Solvents : Remaking plastics for a circular economy

2020 ◽  
Vol 64 (1) ◽  
pp. 4-15 ◽  
Author(s):  
James Sherwood

Recycling of plastic is an established technology contributing to a circular economy. A sustainable society requires recycling to produce high quality feedstocks from all types of reusable waste. New recycling technologies will help to improve waste management practices, for instance dissolving plastic waste in a solvent to purify and maintain its material properties. In solution it is also possible to depolymerise polymers into monomers that can be used to remake virgin-grade material. In this review the advantages and disadvantages of three solvent-based recycling processes will be considered: separation of cotton and polyester (polyethylene terephthalate (PET)) textiles, chemical recycling of polylactic acid (PLA) and dissolution-precipitation of polyvinylchloride (PVC). The current state of the art and future prospects are discussed, including a brief overview of how solvents are being used to process other types of plastic waste.

2021 ◽  
Vol 10 (11) ◽  
pp. 434
Author(s):  
Katrien Steenmans ◽  
Phillip Taylor ◽  
Ine Steenmans

Blockchain technology is emerging as a plausible disruptor of waste management practices that influence the governance of plastics. The interest among the waste management community in the potential and fundamental changes to complex resource management associated with blockchain adoption parallels recent research in other sectors, such as finance, health, public administration, etc. During any comparable period characterized by a step-change in positive coverage of an early-stage technology, it can be challenging for actors to access a grounded, evidence-based oversight of the current state of practice and make informed decisions about whether or how to adopt blockchain technology. The current absence of such a systematic overview of recent experiences with blockchain initiatives disrupting waste practices not only limits the visibility of these experimental efforts, but also limits the learning that can be shared across waste plastics researcher and practitioner communities. This paper contributes with a current overview of blockchain technology adoption in the waste management sector, giving particular attention to implications for the governance of plastics. Our study draws on both primary interview data and secondary documentation data to map the landscape of current blockchain initiatives in the global waste sector. We identify four areas of blockchain use that are beginning to change waste management practices (payment, recycling and reuse rewards, monitoring and tracking of waste, and smart contracts). We conclude by outlining five areas of significant blockchain uses, implications, and influences of relevance to the development of circular plastic waste governance in both research and practice.


Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1229
Author(s):  
Alberto Di Bartolo ◽  
Giulia Infurna ◽  
Nadka Tzankova Dintcheva

The European Union is working towards the 2050 net-zero emissions goal and tackling the ever-growing environmental and sustainability crisis by implementing the European Green Deal. The shift towards a more sustainable society is intertwined with the production, use, and disposal of plastic in the European economy. Emissions generated by plastic production, plastic waste, littering and leakage in nature, insufficient recycling, are some of the issues addressed by the European Commission. Adoption of bioplastics–plastics that are biodegradable, bio-based, or both–is under assessment as one way to decouple society from the use of fossil resources, and to mitigate specific environmental risks related to plastic waste. In this work, we aim at reviewing the field of bioplastics, including standards and life cycle assessment studies, and discuss some of the challenges that can be currently identified with the adoption of these materials.


2020 ◽  
Author(s):  
Megan Mohadjer Beromi ◽  
C. Rose Kennedy ◽  
Jarod M. Younker ◽  
Alex E. Carpenter ◽  
Sarah J. Mattler ◽  
...  

Closed-loop recycling offers the opportunity to help mitigate plastic waste through reversible polymer construction and deconstruction. While examples of the chemical recycling polymers are known, few have been applied to materials derived from abundant commodity olefinic monomers that are the building blocks of ubiquitous plastic resins. Here we describe a [2+2] cycloaddition oligomerization of 1,3-butadiene to yield a previously unrealized telechelic microstructure of (1,n’-divinyl)oligocyclobutane. This material is thermally stable, has stereoregular segments arising from chain-end control, and exhibits high crystallinity even at low molecular weight. Exposure of the oligocyclobutane to vacuum in the presence of the pyridine(diimine) iron precatalyst used to synthesize it resulted in deoligomerization to generate pristine butadiene, demonstrating a rare example of closed-loop chemical recycling of an oligomeric material derived from a commodity hydrocarbon feedstock.


2021 ◽  
Vol 13 (17) ◽  
pp. 9986
Author(s):  
Mark Anthony Camilleri

Although previous researchers have explored the circular economy practices of different businesses in various contexts, currently, there are still a few contributions that are focused on the sustainable preparation and consumption of food in the tourism and hospitality industry context. Hence, this paper sheds light on case studies from hotels, restaurants, and cafes that are located in urban tourist destinations. This research suggests that catering businesses can implement a number of responsible initiatives by introducing preventative measures and recycling practices to curb food loss and the generation of waste. In conclusion, this contribution implies that there is scope for regulatory authorities and policymakers to encourage hospitality practitioners to engage in circular economy approaches and to incentivize them to minimize food waste in tourism cities.


2020 ◽  
Vol 2 (1) ◽  
pp. 100066
Author(s):  
Sizwe M. Nxumalo ◽  
Sizwe D. Mabaso ◽  
Sipho F. Mamba ◽  
Saico S. Singwane

Author(s):  
Saravan Krishnamurthy ◽  
Geoffrey Fudurich ◽  
Prakash Rao

The stewardship of resources for the good of the people is an ancient concept in India, practiced by revered kingdoms. This chapter discusses the original ideals of stewardship and how colonization caused a deterioration of this philosophy in favor of materialistic wealth generation. Colonization followed by the development of an industrialized and capitalistic leaning in the economy brought wealth and increased consumption for Indian people and also created multiple waste-related issues. These issues require a drastic overhaul of waste management practices, with particular attention to industrial ecology. Modern stewardship by India's CSR community is essential to prevent further environmental degradation due to poor waste management practices. The circular economy holds promise as a new economic system and philosophy that can refocus society towards the values of stewardship espoused by the nation's ancestors, while transitioning to a circular economy.


Resources ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 40
Author(s):  
Aida Hosseinian ◽  
Jenni Ylä-Mella ◽  
Eva Pongrácz

Circular economy has emerged as a sustainable alternative to the traditional, linear, extract-produce-use-dump economy. The scientific society, practitioners, policymakers, and business sectors are all actively taking part in driving the transition toward circular economy in their own sectors. Every sector is striving to address the environmental issues of their own area, and to find solutions to the problem of resource scarcity. However, there is a lack of comprehensive studies on the general status of circular economy research and applied projects. Finland aims to be a global pioneer in this field, which is why there is a tremendous boost in research in various fields of sustainable materials management. Therefore, there is a need to have a better perspective of the research society’s efforts to accelerate the transition to circular economy. The objective of this paper is to review scientific research and practices of circular economy transition in Finland, in order to categorize and analyze them. The paper aims to give an insight into the current status and provide a comprehensive understanding of the trend changes during the past 20 years. The analysis shows that there is growing attention to circular economy in many research fields, researchers and practitioners in all fields have responded to the need of the society. However, the recycling-based ‘end-of-pipe’ interpretation of circular economy is still more dominant than developing and implementing strategies for circular product design, dematerializing society, and developing service-based business models. It is important to bear in mind that circular economy is about much more than improved resource flows and waste management practices. Achieving a circular economy needs the engagement of the society, it needs invention and innovation and it also requires the creation of new technologies, products, services, and business models. This study gives a comprehensive perspective at the national level and addresses the key actions and sectors which require more investment and attention from the scientific community to boost the transition toward circular economy. There are some limitation in this study derived from the method of data collection and selection of databases. Due to this, there may be valuable works that were not published, or only in the Finnish language and were, therefore, not identified in this study.


Zero Waste ◽  
2019 ◽  
pp. 105-113 ◽  
Author(s):  
Savita Sharma ◽  
Sharada Mallubhotla

2021 ◽  
pp. 0734242X2098878
Author(s):  
Ejder Ayçin ◽  
Sema Kayapinar Kaya

Zero waste has an important position in the circular economy model in terms of manufacturing recyclable products instead of products to be consumed quickly, reducing the amount of waste, developing and implementing recycling/reuse technologies, and thus ensuring resource efficiency. A zero-waste strategy is one of the basic steps to achieve the goal of the circular economy. The number of studies conducted on Turkey’s zero waste management strategies referring to the circular economy is quite limited. To fill this gap in the literature, this study aims to identify the potential barriers which have an important role in zero waste management practices in Turkey. Through a broad literature review and expert opinions, 12 key barriers for zero waste implementation in Turkey have been defined in view of circular economy principles. Then, fuzzy DEMATEL methodology is employed to examine which is the most influential barrier affecting zero waste management success and to identify the interdependence of these barriers. The results indicate that uncertainty of the goals and tactics relevant to the circular economy and lack of financial and economic aid are key causal barriers that affect Turkey’s zero waste management.


2021 ◽  
Vol 9 (1) ◽  
pp. 17
Author(s):  
Tetiana Vitenko ◽  
Nataliia Marynenko ◽  
Iryna Kramar

The development of the waste management system in the European Union is studied. The waste management practices in a range of the EU countries are analyzed. The main principles of solving the problem of managing waste in the EU are revealed. A comparison of indicators for waste management in the EU and Ukraine is provided. The dominant European trends among other areas of waste—“zero waste” and “circular economy”—are identified. The regulatory framework for waste management developed in Ukraine as a step towards international environmental safety standards is discussed.


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