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Dynamics of backfill compressive strength obtained from enrichment tails for the circular waste management 利用浓缩尾料获得的回填抗压强度动态变化,用于循环废物管理
IF 5.4 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-06-25 DOI: 10.1016/j.rcradv.2024.200224
Liqiang Ma , Yousef Ghorbani , Cheynesh B. Kongar-Syuryun , Marat M. Khayrutdinov , Roman V. Klyuev , Alexander Petenko , Vladimir Brigida

At the current stage of development, the transition to a circular economy is a single option to achieve sustainable mining. Purpose was to identify a direction for mining tailings usage based on the circular waste management. The novelty of the author's approach lies in regulation of mechanical treatment of slag to optimize the backfill composition. The methodology involved a study of mining waste (slag) obtained from major (eight) metallurgical plants in Russia. For mathematical processing primary data, smoothing and deterministic three-dimensional interpolation methods were used. As a result, for the first time it has been established that the ultimate uniaxial compressive strength after mechanical treatment of slag increases by logarithmic laws. As the curing time increases from 10 days to 90 days (with the addition of Ca or Si) the strength increases by 21 % (7 % and 23 %). The possibility of completely replacing the traditional cement binder with metallurgical slag in the backfill composite has been proven. It has been established that the use of activation treatment (both mechanical and chemical) makes it possible to increase the strength characteristics of backfill samples after their curing. The principle of organizing mining production has been implemented, which provides for the use of intermediate products (blast furnace granulated slag), previously classified as technogenic waste, in a closed production cycle. The introduction of this principle will eliminate (minimize) the formation of man-made waste. The scientific merit of replacing traditional cement binder with technogenic waste (blast furnace granulated slag) allows implementation of circular economy in mining.

在当前发展阶段,向循环经济转型是实现可持续采矿的唯一选择。目的是在循环废物管理的基础上确定采矿尾矿利用的方向。作者方法的新颖之处在于对矿渣进行机械处理,以优化回填成分。研究方法包括对俄罗斯主要(8 家)冶金厂的采矿废料(矿渣)进行研究。在对原始数据进行数学处理时,使用了平滑法和确定性三维插值法。结果,首次确定了矿渣经机械处理后的最终单轴抗压强度按对数规律增加。随着固化时间从 10 天增加到 90 天(添加 Ca 或 Si),强度增加了 21%(7% 和 23%)。在回填复合材料中用冶金矿渣完全取代传统水泥粘结剂的可能性已经得到证实。已经证实,使用活化处理(机械和化学)可以提高回填样品固化后的强度特性。采矿生产组织原则已经实施,该原则规定在封闭的生产循环中使用以前被归类为技术废物的中间产品(高炉粒化渣)。这一原则的引入将消除(尽量减少)人为废物的形成。用技术废料(高炉粒化矿渣)替代传统水泥粘合剂的科学价值使采矿业得以实施循环经济。
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引用次数: 0
Fueling circularity: A thorough review of circular practices in the aviation sector with sustainable fuel solutions 为循环性提供燃料:全面审查航空业采用可持续燃料解决方案的循环做法
IF 5.4 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-06-24 DOI: 10.1016/j.rcradv.2024.200223
Ridab Khalifa, Mohammad Alherbawi, Yusuf Bicer, Tareq Al-Ansari

Aviation plays a crucial role in global economic growth and can be influenced by events like COVID-19 and climate change. The aviation sector has a significant carbon footprint that can be correlated with extreme weather conditions, outlining challenges faced by airports and proposing strategies such as environmental management, advanced fuels, and retirement of older aircraft. This review analyzes 107 scientific papers and reports to explore the opportunities to integrate a circular economy (CE) within the aviation sector, emphasizing on waste management and circular aviation practices. It highlights the sector's initiatives on in-cabin waste reduction, waste tracking systems, and plastic-free flights. Moreover, it covers the industry's efforts to adopt circular economy principles to convert waste (in-cabin and end-of-use) into Sustainable Aviation Fuels (SAFs). It outlines diverse biofuel production methods, including alcohol upgrading, fermentation, gasification-Fischer Tropsch, and thermochemical processes. It also discusses innovative technologies such as microbial and enzymatic approaches and power-to-liquid (PtL). The review examines the global challenges and policies surrounding sustainable waste management in airports, emphasizing the disconnect between sustainability goals and rising waste output accompanying the need for more effective policies and research on emissions quotas and consumption patterns. Additionally, it addresses the need for collaboration and innovative technologies regarding waste-to-energy (WtE) conversion to achieve comprehensive and efficient airport waste management strategies. The integration of CE within airport vicinities is vital to mitigate the environmental impacts by emphasizing the importance of waste management strategies and utilizing aviation waste such as cabin waste and end-of-use waste as a valuable resource for SAFs production, which continues to face several challenges related to scalability, technological readiness, and economic viability.

航空业在全球经济增长中发挥着至关重要的作用,并可能受到 COVID-19 和气候变化等事件的影响。航空业的碳足迹很大,可能与极端天气条件相关,概述了机场面临的挑战,并提出了环境管理、先进燃料和老旧飞机退役等战略。本综述分析了 107 篇科学论文和报告,探讨了将循环经济(CE)融入航空业的机会,重点关注废物管理和循环航空实践。报告重点介绍了航空业在减少机舱内废弃物、废弃物跟踪系统和无塑料飞行方面的举措。此外,报告还介绍了航空业采用循环经济原则将废弃物(机舱内和使用终端)转化为可持续航空燃料(SAF)的努力。报告概述了各种生物燃料的生产方法,包括酒精升级、发酵、气化-费舍尔-特罗普什(Fischer Tropsch)和热化学工艺。报告还讨论了微生物和酶法以及动力液化(PtL)等创新技术。综述探讨了围绕机场可持续废物管理的全球挑战和政策,强调了可持续发展目标与不断增加的废物产出之间的脱节,以及对排放配额和消费模式进行更有效的政策和研究的必要性。此外,该报告还探讨了在废物转化为能源(WtE)方面开展合作和采用创新技术的必要性,以实现全面、高效的机场废物管理战略。通过强调废弃物管理策略的重要性,以及利用航空废弃物(如机舱废弃物和最终使用废弃物)作为生产 SAFs 的宝贵资源,在机场周边地区整合 CE 对减轻环境影响至关重要。
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引用次数: 0
From waste to resource: Exploring the recyclability and performance of gypsum-graphene nanofiber composites 从废物到资源:探索石膏-石墨烯纳米纤维复合材料的可回收性和性能
IF 5.4 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-06-14 DOI: 10.1016/j.rcradv.2024.200222
Alejandro Martinez Gordon, María Isabel Prieto Barrio, Alfonso Cobo Escamilla, Alberto Leal Matilla

Gypsum is a widely used building material with a variety of benefits, including good fire resistance, sound insulation, and environmental friendliness. However, gypsum disposal is commonly associated with significant environmental risks, including unhealthy gas emissions and land degradation. Gypsum recycling can help to reduce these impacts, but it can also lead to a decrease in the performance of the recycled gypsum products. This study investigated the effects of graphene nanofibers (GNFs) on the recyclability and properties of gypsum plasters. The results showed that test samples containing 1 % of GNFs exhibited improved mechanical response, with flexural and compressive strength exceeding those of neat gypsum by 30 % and 60 % respectively. This improvement is attributed to the retained functional properties of GNFs during the recycling process. Recycled gypsum pastes containing GNFs presented a more uniform and denser matrix with longer crystals, enhanced bonding, and reduced porosity. These findings suggest that GNFs can be used to facilitate the recycling of gypsum waste and to produce recycled gypsum components with improved properties. Overall, this study demonstrates the potential of GNFs to improve the sustainability and performance of recycled gypsum plasters.

石膏是一种广泛使用的建筑材料,具有多种优点,包括良好的耐火性、隔音性和环保性。然而,石膏的处理通常会带来巨大的环境风险,包括不健康气体的排放和土地退化。石膏回收有助于减少这些影响,但同时也会导致回收石膏产品的性能下降。本研究调查了石墨烯纳米纤维(GNF)对石膏抹灰的可回收性和性能的影响。结果表明,含有 1% GNFs 的测试样品显示出更好的机械响应,抗折强度和抗压强度分别比纯石膏高出 30% 和 60%。这种改善归功于 GNF 在回收过程中保留的功能特性。含有 GNF 的回收石膏浆料呈现出更均匀、更致密的基质,晶体更长,粘结力更强,孔隙率更低。这些研究结果表明,GNF 可用于促进石膏废料的回收利用,并生产出性能更好的回收石膏成分。总之,这项研究证明了 GNF 在改善再生石膏抹灰的可持续性和性能方面的潜力。
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引用次数: 0
Incorporating decentralized facilities into the food waste treatment infrastructure in Megacity: A locational optimization in Beijing 将分散式设施纳入特大城市餐厨垃圾处理基础设施:北京的选址优化
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-06-08 DOI: 10.1016/j.rcradv.2024.200221
Haoran Qiao , Xin Tong , Ling Han , Shengnan Wang

Food waste management has emerged as a pivotal issue with the acceleration of urbanization. Inappropriate treatment of food waste causes environmental contamination, resource squandering, and land occupation. This research explores optimal strategies in Beijing with an experimental case study on the bioconversion technology using black soldier fly larvae (BSFL), comparing centralized and decentralized approaches. We studied waste sorting behaviors influenced by community characteristics, employing an Agent-Based Model (ABM) and a mixed integer non-linear programming (MINLP). Results indicate that 29 % of Beijing's food waste could be suitably managed through decentralized methods with BSFL, particularly in outlying areas and densely populated suburbs. Decentralized treatment exhibits the potential to boost waste separation participation in medium-sized, close- knit communities. However, this approach encounters hurdles related to technological implementation, public perception, and urban planning. This study underscores the need for community-specific strategies and a concerted effort from communities, government, and the private sector in advancing sustainable urban food waste management.

随着城市化进程的加快,厨余垃圾管理已成为一个关键问题。餐厨垃圾的不当处理会造成环境污染、资源浪费和土地占用。本研究通过对利用黑背天蝇幼虫(BSFL)进行生物转化技术的实验案例研究,比较集中式和分散式方法,探索北京的最佳策略。我们采用基于代理的模型(ABM)和混合整数非线性编程(MINLP)研究了受社区特征影响的垃圾分类行为。结果表明,北京 29% 的厨余垃圾可通过 BSFL 分散方法进行适当管理,尤其是在偏远地区和人口稠密的郊区。分散式处理方法有可能提高中等规模、人口密集社区的垃圾分类参与率。然而,这种方法在技术实施、公众认知和城市规划方面遇到了障碍。这项研究强调,在推进可持续城市食物垃圾管理的过程中,社区、政府和私营部门需要制定针对具体社区的战略,并共同努力。
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引用次数: 0
Closing the loop of small WEEE – life cycle based approach for the evaluation of end-of-life strategies on the example of coffee machines 小型废弃电子电气设备的闭环--以咖啡机为例,采用基于生命周期的方法评估报废战略
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-06-06 DOI: 10.1016/j.rcradv.2024.200220
Malina Nikolic , Gianna Bergmann , Nora Schelte , Semih Severengiz

Waste of Electrical and Electronic Equipment (WEEE) is one of the fastest growing waste streams in Europe. Only 42.5 % of WEEE is collected and recycled with even lower rates for small WEEE, leading to significant environmental pressures. Applying end-of-life (EoL) strategies helps to ensure raw material availability, increases price resilience and reduces environmental impacts.

This study analyses greenhouse gas (GHG) and cost saving potentials of EoL strategies (recycling, component reuse, remanufacturing and reuse), performed by manufacturers with own take-back systems. A life cycle assessment (LCA), including production, transport and EoL, is conducted to measure the GHG emissions, followed by a unit cost calculation. The results are compared with current practices of WEEE disposal, including WEEE in centralised collection and recycling system (WEEE recycling). As a representative for small EEE, the use case is based on a coffee machine.

The LCA shows that manufacturers have great potential to reduce their products' emissions over the life cycle by taking back WEEE and implementing EoL strategies in-house. Thereby, GHG emissions can be reduced by 15–39 % over the life cycle compared to the WEEE recycling, whereby reuse and remanufacturing strategies have the highest reduction potential.

Moreover, all analysed EoL strategies have the potential to reduce unit costs compared to linear production of a new machine. While the recycling scenario has the lowest cost savings at 7.7 % (new machine with recycled content), the reuse scenario can reduce unit costs by 66.5 % (tested and cleaned only) compared to the status quo.

电气和电子设备废物 (WEEE) 是欧洲增长最快的废物流之一。只有 42.5% 的 WEEE 被收集和回收,小型 WEEE 的回收率甚至更低,这导致了巨大的环境压力。本研究分析了由拥有回收系统的制造商实施的生命周期策略(回收、部件再利用、再制造和再利用)的温室气体(GHG)和成本节约潜力。生命周期评估(LCA)包括生产、运输和 EoL,以测量温室气体排放量,然后计算单位成本。评估结果与当前的废弃电子电气设备处理方法进行了比较,包括集中收集和回收系统中的废弃电子电气设备(废弃电子电气设备回收)。生命周期分析表明,制造商通过回收废弃电子电气设备并在内部实施 EoL 战略,在减少其产品生命周期内的排放量方面具有巨大潜力。因此,与回收废旧电子电气设备相比,在整个生命周期内,温室气体排放量可减少 15-39%,其中再利用和再制造策略的减排潜力最大。此外,与线性生产新机器相比,所有分析的 EoL 策略都有可能降低单位成本。回收利用方案节省的成本最低,仅为 7.7%(含回收成分的新机器),而再利用方案与现状相比,可将单位成本降低 66.5%(仅经过测试和清洁)。
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引用次数: 0
A critical analysis of circular product attributes and limitations of product circularity assessment methods 对循环产品属性和产品循环性评估方法局限性的批判性分析
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-05-29 DOI: 10.1016/j.rcradv.2024.200219
Junwon Ko , Gisele Bortolaz Guedes , Fazleena Badurdeen , I.S. Jawahir , K.C. Morris , Vincenzo Ferrero , Buddhika Hapuwatte , Ryan Bradley , Ardeshir Raihanian

The Circular Economy (CE) has been proposed as a strategy to promote the efficient use of resources, maximizing the benefits derived from materials and products through value recovery strategies, and minimizing waste generation. However, ambiguity remains in defining what makes a product circular and its characteristics when adapting the CE concept for application at the product level. More clarity about the constitutive characteristics of Circular Products (CPs) is also vital to facilitate their design. To address this challenge, and with the intention to increase the adoption of CE concept within the industry, the descriptions and attributes of a Circular Product (CP) were examined through a scoped literature review and analysis. Findings were then synthesized to establish a preliminary framework of CP attributes. These attributes were used to review the existing product circularity assessment methods. The results highlight limitations in the coverage of CP attributes in the existing methods and research opportunities for their improvement. The findings from this study will contribute to the development of a comprehensive and accurate product circularity assessment method.

循环经济(CE)是作为一种战略提出的,旨在促进资源的有效利用,通过价值回收战略使材料和产品的效益最大化,并最大限度地减少废物的产生。然而,在将循环经济概念应用于产品层面时,在界定什么是循环产品及其特征方面仍然存在模糊性。进一步明确循环产品(CP)的构成特征对于促进其设计也至关重要。为了应对这一挑战,同时也为了在行业内更多地采用 CE 概念,我们通过范围广泛的文献综述和分析,对循环产品(CP)的描述和属性进行了研究。然后对研究结果进行综合,建立了一个初步的循环产品属性框架。这些属性被用于审查现有的产品循环性评估方法。研究结果强调了现有方法在覆盖氯化石蜡属性方面的局限性,以及改进这些方法的研究机会。这项研究的结果将有助于开发一种全面、准确的产品循环性评估方法。
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引用次数: 0
Clinker-free CaO-activated silica fume as a cementitious binder for pavement application 不含熟料的氧化钙活性硅灰作为水泥基粘结剂用于路面应用
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-05-15 DOI: 10.1016/j.rcradv.2024.200218
Shreyas Pranav , Mukund Lahoti , G. Muthukumar , En-Hua Yang

Ordinary Portland cement (OPC) production requires heating limestone up to 1450 °C and produces 0.5–0.9 kg of carbon dioxide for every 1 kg produced. Moreover, the massive volume of cement manufactured around the world every year adds to the urgent need to look for sustainable alternatives. This work proposes a novel calcium oxide (CaO)-activated high-volume silica fume mixture as a cementitious binder for pavement application that can address the sustainability concern with cement (because producing CaO requires a much lower calcination temperature than OPC, and that CaO is also used in low-volume in the binder). The combination of low-volume CaO and high-volume silica fume, particularly as a pavement binder has not been studied in the literature before. The compressive and flexural strength results showed that even by using a small fraction of CaO in the binder, it is possible to obtain acceptable strengths that satisfy ASTM pavement design guidelines, while OPC is unable to provide similar strengths at such low dosage. The mix having CaO content as 30 % of the silica fume content (CSF-30) shows the highest compressive strength (28d: 18.4 MPa) and flexural strength (28d: 4 MPa). In contrast, the maximum OPC-silica fume compressive and flexural strengths observed are 13.9 MPa and 2.9 MPa respectively at 28d From the microstructural results, it was seen that CaO–silica fume develops strength due to formation of calcite and calcium silicate hydrate. Almost all CaO–silica fume mixes exhibited lower porosity compared to their OPC-silica fume counterparts; CSF-30, the mix having the best mechanical performance showed the lowest porosity at 28d (2.8 %). A comparative sustainability analysis followed by a 5D analysis considering all the parameters studied in this work revealed that CSF-30 is the best binder alternative (overall score: 5.24). The results of this work will be useful for pavement users, designers, researchers, engineers, and relevant government officials, in having a sustainable clinker-free alternative pavement binder to OPC, particularly for low-volume roads, that satisfies the pavement design guidelines.

生产普通硅酸盐水泥(OPC)需要将石灰石加热至 1450 °C,每生产 1 公斤水泥会产生 0.5-0.9 公斤二氧化碳。此外,全世界每年生产的水泥量巨大,因此迫切需要寻找可持续的替代品。本研究提出了一种新型氧化钙(CaO)活化高容量硅灰混合物,作为水泥基粘结剂用于路面应用,可解决水泥的可持续性问题(因为生产 CaO 所需的煅烧温度比 OPC 低得多,而且 CaO 在粘结剂中的用量也较少)。以前的文献中还没有研究过将低用量的氧化钙和高用量的硅灰结合在一起,特别是作为路面粘结剂的情况。抗压和抗折强度结果表明,即使在粘结剂中使用少量 CaO,也能获得符合 ASTM 路面设计准则的可接受强度,而 OPC 在如此低的用量下无法提供类似的强度。CaO 含量为硅灰含量 30% 的混合料(CSF-30)显示出最高的抗压强度(28d:18.4 兆帕)和抗弯强度(28d:4 兆帕)。相比之下,28d 时观察到的 OPC-硅灰最高抗压强度和抗折强度分别为 13.9 MPa 和 2.9 MPa。从微观结构结果可以看出,CaO-硅灰由于形成方解石和硅酸钙水合物而产生强度。几乎所有氧化钙-硅灰混合物的孔隙率都低于 OPC-硅灰混合物;机械性能最好的 CSF-30 混合物在 28d 时孔隙率最低(2.8%)。比较可持续性分析和 5D 分析(考虑了本研究中的所有参数)显示,CSF-30 是最佳的粘结剂替代品(总分:5.24)。这项工作的结果将有助于路面使用者、设计师、研究人员、工程师和相关政府官员获得一种可持续的无熟料路面粘结剂,以替代 OPC,特别是用于小容量道路,并满足路面设计指南的要求。
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引用次数: 0
Environmental footprint analysis of domestic air source heat pumps 家用空气源热泵的环境足迹分析
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-05-03 DOI: 10.1016/j.rcradv.2024.200217
Sahil Ali Khan , Richard O‘Hegarty , Donal Finn , Oliver Kinnane

Air source heat pumps (ASHP) are increasingly being recognised as a low carbon alternative to traditional fossil fuel type heating systems for residential buildings, with many countries targeting their mass deployment to meet their emissions reduction goals. However, the environmental impacts of ASHPs throughout their entire life cycle to include manufacture and end-of-life, as well as operation, have not received comprehensive attention to date. This study addresses this gap by conducting a review of research quantifying the life cycle impact of domestic ASHPs, coupled with an examination of technology uptake and deployment. By analysing the entire life cycle, from production to end-of-life, the ASHP's global warming potential is estimated to be 35.8 t CO2 equivalent over the lifetime of 17 years identified by the study. Additionally, the study conducts a comparative analysis of the operational footprint of selected countries based on their electricity carbon footprint and the ratio of embodied to operational footprint, which ranges from 4 to 65, indicating potential for improvement. Furthermore, the study calculates the global warming potential using both the seasonal performance factor specified by a heat pump manufacturer and real-world field trial data. The findings unveil a significant disparity of 20 % between the two methodologies, underscoring the paramount importance of incorporating in-field heat pump performance data when evaluating their environmental impact.

空气源热泵(ASHP)越来越被视为住宅建筑传统化石燃料供热系统的低碳替代品,许多国家都将其大规模应用作为实现减排目标的目标。然而,迄今为止,ASHPs 在其整个生命周期(包括制造和报废以及运行)中对环境的影响尚未得到全面关注。本研究通过对量化家用空调热水器(ASHPs)生命周期影响的研究进行回顾,并结合对技术吸收和部署的研究,弥补了这一空白。通过分析从生产到报废的整个生命周期,ASHP 在研究确定的 17 年生命周期内的全球升温潜能值估计为 35.8 吨二氧化碳当量。此外,该研究还根据选定国家的电力碳足迹和体现足迹与运行足迹之比,对这些国家的运行足迹进行了比较分析。此外,研究还利用热泵制造商指定的季节性性能系数和实际现场试验数据计算了全球变暖潜势。研究结果表明,两种方法之间存在 20% 的显著差异,这突出表明,在评估热泵对环境的影响时,纳入现场热泵性能数据至关重要。
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引用次数: 0
An evaluation of the environmental impact and energy efficiency of producing geopolymer mortar with plastic aggregates 使用塑料骨料生产土工聚合物砂浆的环境影响和能源效率评估
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-04-12 DOI: 10.1016/j.rcradv.2024.200216
Georgy Lazorenko , Ekaterina Kravchenko , Anton Kasprzhitskii , Elham H. Fini

The imperative to mitigate carbon emissions and seek sustainable alternatives to cementitious materials has driven the advancement of geopolymer binders, which are inorganic binders of aluminosilicate industrial-waste materials activated by alkaline agents. The use of geopolymers carries the potential for significant reductions in greenhouse gas emission. Furthermore, the incorporation of plastic waste as aggregates addresses not only resource conservation but also environmental sustainability. This study conducted a comprehensive life-cycle assessment of the use of geopolymers from fly ash as a precursor with polyethylene terephthalate (PET) waste as a substitute for natural aggregates. It was observed that when replacing natural aggregates with PET waste to the maximum extent, the global warming potential (GWP) in the category of emissions related to aggregate preparation increased by 16.7 %. This increase was attributed to significant emissions generated during PET processing, including activities such as washing and grinding. The total GWP to produce one cubic meter of geopolymer mixture was 643.55 kgCO2-e without PET aggregates and 667.86 kgCO2-e with maximum use of PET aggregates. The optimization of energy-intensive PET preparation processes led to a remarkable reduction of 19.63 % for production of geopolymer mixture with maximum use of PET aggregates. These findings show the potential for improved sustainability in the production of geopolymer mixtures and emphasize the critical role of optimizing the production processes in mitigating their environmental impact.

减少碳排放和寻求水泥基材料的可持续替代品势在必行,这推动了土工聚合物粘结剂的发展。使用土工聚合物有可能显著减少温室气体排放。此外,将塑料废弃物作为骨料不仅能节约资源,还能实现环境的可持续发展。本研究对以粉煤灰为前体、聚对苯二甲酸乙二酯(PET)废料为天然骨料替代物的土工聚合物的使用进行了全面的生命周期评估。据观察,当最大限度地用 PET 废弃物替代天然集料时,与集料制备相关的排放类别中的全球升温潜能值(GWP)增加了 16.7%。这一增加归因于 PET 加工过程中产生的大量排放,包括清洗和研磨等活动。在不使用 PET 骨料的情况下,生产一立方米土工聚合物混合物的全球升温潜能值为 643.55 kgCO2-e,在最大程度使用 PET 骨料的情况下为 667.86 kgCO2-e。通过优化能源密集型 PET 制备工艺,在最大限度使用 PET 骨料的情况下,生产土工聚合物混合物的全球升温潜能值显著降低了 19.63%。这些研究结果表明,土工聚合物混合物的生产具有改善可持续性的潜力,并强调了优化生产工艺在减轻其环境影响方面的关键作用。
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引用次数: 0
Quantitative impact analysis of cross-border tourism on global food greenhouse gas emissions 跨境旅游对全球食品温室气体排放的定量影响分析
Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-04-12 DOI: 10.1016/j.rcradv.2024.200215
Xingyu Zhao , Jingyu Zhu , Ke Yin , Guoyu Ding , Chao He

Globalization has fueled the rapid expansion of international tourism, significantly impacting global food systems. This study aims to quantitatively evaluate the influence of tourism on global food greenhouse gas (GHG) emissions. By integrating the Food and Agriculture Organization Statistical Database and the World Tourism Organization Tourism Statistics database, we analyze regional differences in dietary choices among cross-border tourists and connect them to detailed national-level food supply inventories, enabling us to estimate the GHG emissions associated with cross-border tourism. Additionally, we employ the modified Regional Integrated model of Climate and the Economy (RICE) model to project future trends in tourism-related GHG emissions across regions and countries. Our findings indicate that tourism has resulted in a reduction of 620 Mt CO2e in global food system emissions between 2001 and 2019. Taking into account tourism development trajectories and regional economic growth, our projection suggests that GHG emissions reduction from the global food system resulting from tourism could reach a substantial 96 Mt CO2e per year by 2100. The analysis shows that strengthening the national economy and increasing the labor force, and taking reasonable measures to change the social diet pattern in different regions can further reduce tourism embodied food GHG emissions. This study highlights the significant role of tourism in mitigating global food system emissions and underscores the potential for further emission reductions in the future.

全球化推动了国际旅游业的快速发展,对全球粮食系统产生了重大影响。本研究旨在定量评估旅游业对全球粮食温室气体(GHG)排放的影响。通过整合粮食及农业组织统计数据库和世界旅游组织旅游统计数据库,我们分析了跨境游客饮食选择的地区差异,并将其与详细的国家级粮食供应清单联系起来,从而估算出与跨境旅游相关的温室气体排放量。此外,我们还采用修改后的气候与经济区域综合模型(RICE)来预测与旅游业相关的温室气体排放在不同地区和国家的未来趋势。我们的研究结果表明,从 2001 年到 2019 年,旅游业使全球粮食系统的二氧化碳排放量减少了 6.2 亿吨。考虑到旅游业的发展轨迹和地区经济增长,我们的预测表明,到 2100 年,旅游业带来的全球粮食系统温室气体减排量将达到每年 9,600 万二氧化碳当量。分析表明,加强国民经济和增加劳动力,并采取合理措施改变不同地区的社会饮食模式,可以进一步减少旅游体现的食物温室气体排放。这项研究强调了旅游业在减缓全球粮食系统排放方面的重要作用,并强调了未来进一步减排的潜力。
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Resources, conservation & recycling advances
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