Smart Sustainable Production and Distribution Network Model for City Multi-Floor Manufacturing Clusters

This study focuses on management ways within a city multi-floor manufacturing cluster (MFMC). The application of MFMC in megapolises is closely related to the problem of urban spatial development and the problem of matching transport and logistics services. The operation of the MFMC depends on the efficiency of production and transport management considering technical, economic, end environmental factors. Therefore, conditions affecting decision-making in the field of production planning by MFMCs and accompanying transports within the agglomeration area with the use of the production-service platform were presented. Assumptions were created for the decision model, allowing for the selection of partners within the MFMC to execute the production order. A simplified decision model using the Hungarian algorithm was proposed, which was verified with the use of test data. The model is universal for material flow analysis and is an assessments basis for smart sustainable supply chain decision-making and planning. Despite the narrowing of the scope of the analysis and the simplifications applied, the presented model using the Hungarian algorithm demonstrated its potential to solve the problem of partner selection for the execution of the contract by MFMC.

Waste in islands: a political ecology perspective on postcolonial metabolism

Islands are tightly connected to globalized material flows, with specific constraints and vulnerabilities. They are not closed metabolic loops of consumption, production, and waste, favorable to the circular economy. Small islands allow the observation of the material outcomes of circulation, from overflowing dumpsites to marine debris washing up on the shore. We argue that islands are key territories for better understanding the Capitalocene, precisely because of the ways in which they are connected to (rather than isolated from) globalized material flows. This article is a comparative geographical analysis of waste realities in three French/formerly French island territories: Ndzuwani (Comoros), Réunion, and New Caledonia. It builds on metabolism analysis and waste studies—in particular waste colonialism—to address the different perspectives that these approaches open up for the study of island territories. The long-term sociohistorical context of each island helps to explain contemporary waste management policies and practices. A material flow analysis makes it possible to sketch out metabolic profiles that show the contribution of prevailing mining and agricultural industries to waste generation. The comparison of current situations regarding household waste discourses and economies shows how these territories are characterized by waste accumulation.

Two sides of the same coin: increasing material extraction rates and social environmental conflicts in Mexico

This article seeks to explain the multiplication of social environmental conflicts in Mexico as a consequence of expanding and intensifying extractive activities. It examines how the Mexican state has provided private and foreign capital greater access to the country’s natural resources in the transition from state-led import-substituting industrialization to export-oriented market-led development. This, it argues, has led to accelerating material extraction rates in the context of rising global demand for primary commodities; while the negative environmental and social impacts have in turn led to a growing number of conflicts involving the inhabitants of directly affected rural communities, who organize to resist. Based on standardized procedures for material flow analysis, it presents the results of an investigation into the domestic extraction rates of minerals, metal ores, biomass, and fossil fuels from Mexico, between 1990 and 2018. It finds that domestic extraction rates increased significantly during this period, with the exception of fossil fuels, which peaked in 2006, declining thereafter due to the exhaustion of the country’s most important oil reserves. The evolution of domestic extraction rates is juxtaposed with the emergence of related social environmental conflicts by drawing on multiple databases of conflicts around extractive activities in Mexico.

Exploring Interactions Between Fruit and Vegetable Production in a Greenhouse and an Anaerobic Digestion Plant—Environmental Implications

Greenhouse fruit and vegetable production uses large amounts of energy and other resources, and finding ways of reducing its impact may increase sustainability. Outputs generated from solid-state anaerobic digestion (SS-AD) are suitable for use in greenhouses, which creates a need to investigate the consequences of the possible interactions between them. Connecting the fruit and vegetable production with the resource flows from an SS-AD process, e.g., biogas and digestate, could increase circularity while decreasing the total environmental impact. There are currently no studies where a comprehensive assessment of the material flows between greenhouses and SS-AD are analyzed in combination with evaluation of the environmental impact. In this study, material flow analysis is used to evaluate the effects of adding tomato related waste to the SS-AD, while also using life cycle assessment to study the environmental impact of the system, including production of tomatoes in a greenhouse and the interactions with the SS-AD. The results show that the environmental impact decreases for all evaluated impact categories as compared to a reference greenhouse that used inputs and outputs usually applied in a Swedish context. Using the tomato related waste as a feedstock for SS-AD caused a decrease of biomethane and an increase of carbon dioxide and digestate per ton of treated waste, compared to the digestion of mainly food waste. In conclusion, interactions between a greenhouse and an SS-AD plant can lead to better environmental performance by replacing some of the fertilizer and energy required by the greenhouse.

Testing the Applicability of the Safe-by-Design Concept: A Theoretical Case Study Using Polymer Nanoclay Composites for Coffee Capsules

The production and use of engineered nanomaterials and nano-enabled products is increasing, enabling innovations in many application areas, e.g., in the sector of food contact materials. However, nanosafety-relevant information for chemical risk assessment is still scarce, leading to a high level of uncertainty and making the early integration of safety to the innovation process indispensable. This study analyzed the strengths, weaknesses, and applicability of the nano-specific Safe-by-Design (SbD) concept using nanoclay-containing polymer coffee capsules as a theoretical case study. In addition, a material flow analysis was conducted to identify exposure pathways and potential risks, and a multi-stakeholder approach was applied to discursively discuss challenges when attempting to combine safety and innovation at an early stage. The results indicate that the SbD concept is generally welcomed by all stakeholders, but there is a lack of clear rules on the transfer of information between the actors involved. Furthermore, a voluntary, practical application usually requires in-depth knowledge of nanotechnology and often additional financial efforts. Therefore, incentives need to be created, as there is currently no obvious added value from a company’s point of view. The SbD concept should be further developed, standardized, and integrated into existing legal frameworks to be implemented effectively.

A Decision-support System for Recycling of Residents’ Waste Plastics in China Based on Material Flow Analysis and Life Cycle Assessment

Recycling waste plastics is one of the important ways to save petroleum resources and reduce carbon emissions. However, the current recycling rate of waste plastics is still low. Material flow analysis can help determine the flow of waste plastics, and life cycle assessment (LCA) can be used to quantify environmental impacts. The present study integrates these two methods into the model construction of the residents’ waste plastics recycling decision-support system. This model construction is followed by sensitivity analysis of the relevant parameters affecting the performance of the waste plastics recycling system. Finally, present study forecasts the recycling system’s performance and environmental impacts by setting four optimization scenarios based on sensitivity analysis. The results show that in 2019, A total of 8.39 million tons of high-end applications were recovered, carbon emissions during the recycling process were 34.9 million tons, and dioxin emissions were 316.11 g TEQ, with a total emission reduction of 24.47 million tons of CO2 compared to the original production. In the scenario of comprehensive improvement, in 2035, the recycling volume of high-end applications will rise to 33.96 million tons, the carbon emissions will rise to 64.73 million tons, the dioxin emissions will drop to 165.98 g TEQ, and the carbon emission reduction will rise to 99.06 million tons. This research has a certain guiding role for policy makers to formulate industry norms and related policies for waste plastic recycling.