Resources, conservation & recycling advances最新文献_第2页

Cutting-edge techniques and environmental insights in recycled concrete aggregate production: A comprehensive review

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-14 DOI: 10.1016/j.rcradv.2024.200241

Ram Prasad Neupane , Ningombam Reena Devi , Thanongsak Imjai , Abhishek Rajput , Takafumi Noguchi

The rapid growth of urban infrastructure has led to a substantial rise in construction and demolition waste (C&DW), causing environmental issues like overflowing landfills and depletion of natural resources. Recycled concrete aggregates (RCA) offer a sustainable alternative to natural aggregates (NA), helping reduce landfill use and energy consumption by up to 85 % and lowering CO₂ emissions by 90 %, providing significant environmental and economic benefits. However, untreated RCA exhibits lower strength and durability due to adhered mortar and impurities. This review delves into novel and advanced RCA treatment methods and production techniques that enhance RCA's properties. These methods achieve up to 42 % improvement in compressive strength and a 27 % reduction in water absorption. Researchers have found that impact crushers produce higher-quality aggregates compared to jaw or cone crushers. Treatments like acid washing and carbonation enhance particle density and reduce water absorption by 17.5 %. Recycled aggregate concrete (RAC) produced from treated RCA can reach 87 % of the compressive strength of natural aggregate concrete (NAC), with certain combined treatments achieving results close to NAC. Inconsistencies in RCA properties due to various treatments emphasise the need for standardised production and testing guidelines. This review underscores RCA's role in promoting sustainable construction and its potential to significantly mitigate CO₂ emissions, encouraging further research to refine these methods for long-term environmental gains.

{"title":"Cutting-edge techniques and environmental insights in recycled concrete aggregate production: A comprehensive review","authors":"Ram Prasad Neupane , Ningombam Reena Devi , Thanongsak Imjai , Abhishek Rajput , Takafumi Noguchi","doi":"10.1016/j.rcradv.2024.200241","DOIUrl":"10.1016/j.rcradv.2024.200241","url":null,"abstract":"<div><div>The rapid growth of urban infrastructure has led to a substantial rise in construction and demolition waste (C&DW), causing environmental issues like overflowing landfills and depletion of natural resources. Recycled concrete aggregates (RCA) offer a sustainable alternative to natural aggregates (NA), helping reduce landfill use and energy consumption by up to 85 % and lowering CO<sub>2</sub> emissions by 90 %, providing significant environmental and economic benefits. However, untreated RCA exhibits lower strength and durability due to adhered mortar and impurities. This review delves into novel and advanced RCA treatment methods and production techniques that enhance RCA's properties. These methods achieve up to 42 % improvement in compressive strength and a 27 % reduction in water absorption. Researchers have found that impact crushers produce higher-quality aggregates compared to jaw or cone crushers. Treatments like acid washing and carbonation enhance particle density and reduce water absorption by 17.5 %. Recycled aggregate concrete (RAC) produced from treated RCA can reach 87 % of the compressive strength of natural aggregate concrete (NAC), with certain combined treatments achieving results close to NAC. Inconsistencies in RCA properties due to various treatments emphasise the need for standardised production and testing guidelines. This review underscores RCA's role in promoting sustainable construction and its potential to significantly mitigate CO<sub>2</sub> emissions, encouraging further research to refine these methods for long-term environmental gains.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"25 ","pages":"Article 200241"},"PeriodicalIF":5.4,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143090606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Valorisation of gypsum boards with polyurethane waste to promote their circular economy

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-13 DOI: 10.1016/j.rcradv.2024.200240

Alba Rodrigo-Bravo , Sara Pavía , Verónica Calderón Carpintero , Lourdes Alameda Cuenca-Romero , Sara Gutiérrez-González

The new European environmental policies for construction focus on sustainability, promoting energy efficiency, recyclable materials and circularity, with an emphasis on waste management. This study enhances gypsum board circularity by recycling polyurethane gypsum ceiling tiles waste into a new precast material for suspended and demountable ceilings. The process treats the waste as a whole, without separating the original raw materials: gypsum, polyurethane foam waste and fiberglass. The objective is to determine a gypsum mixture, incorporating the maximum amount of waste, with suitable mechanical properties, workability and consistency for industrial replication. The research studies the physical and mechanical properties of the new products. During the manufacturing phase of the new plasters, it is reported that citric acid needs to be added to the mixtures to ensure good workability and to delay the setting time. Without pre-calcination, gypsum mortars with recycled ceiling tile show a 7 to 10 % reduction in bulk density, compared to the reference plaster. Only two of the four samples tested meet the mechanical requirements, with strengths 35 and 60 % lower than those of the control mixture. Finally, the thermal conductivity of the innovative mortars is on average 16 % lower, improving the insulating properties of the material. The results conclude the feasibility of valorising polyurethane gypsum boards waste, promoting sustainable recycling practices.

{"title":"Valorisation of gypsum boards with polyurethane waste to promote their circular economy","authors":"Alba Rodrigo-Bravo , Sara Pavía , Verónica Calderón Carpintero , Lourdes Alameda Cuenca-Romero , Sara Gutiérrez-González","doi":"10.1016/j.rcradv.2024.200240","DOIUrl":"10.1016/j.rcradv.2024.200240","url":null,"abstract":"<div><div>The new European environmental policies for construction focus on sustainability, promoting energy efficiency, recyclable materials and circularity, with an emphasis on waste management. This study enhances gypsum board circularity by recycling polyurethane gypsum ceiling tiles waste into a new precast material for suspended and demountable ceilings. The process treats the waste as a whole, without separating the original raw materials: gypsum, polyurethane foam waste and fiberglass. The objective is to determine a gypsum mixture, incorporating the maximum amount of waste, with suitable mechanical properties, workability and consistency for industrial replication. The research studies the physical and mechanical properties of the new products. During the manufacturing phase of the new plasters, it is reported that citric acid needs to be added to the mixtures to ensure good workability and to delay the setting time. Without pre-calcination, gypsum mortars with recycled ceiling tile show a 7 to 10 % reduction in bulk density, compared to the reference plaster. Only two of the four samples tested meet the mechanical requirements, with strengths 35 and 60 % lower than those of the control mixture. Finally, the thermal conductivity of the innovative mortars is on average 16 % lower, improving the insulating properties of the material. The results conclude the feasibility of valorising polyurethane gypsum boards waste, promoting sustainable recycling practices.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"25 ","pages":"Article 200240"},"PeriodicalIF":5.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143091889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Environmental benefits of airport waste classification and recycling strategies: An analysis of behavior in multi-agent systems

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-11 DOI: 10.1016/j.rcradv.2024.200239

Zixin Bian, Zhibo Zhao, Xinrui Guo, Yifan Gu, Yi Yi, Yuxian Hong, Mingxuan Tuo, Yihan Li, Yufeng Wu

The classification and recycling of airport waste has become a key point in developing green airports. However, airport waste classification involves a large number of stakeholders. The influence factors are complex, and the interactions between the stakeholders are not clear. Based on the agent-based model, we sort out the behaviors and driving factors of the three main stakeholders, namely passengers, collectors, and managers, and construct a multi-agent system of airport waste classification and recycling with the coupling of the waste generation subsystem, the recycling subsystem and the strategy formulation subsystem. By the complex system, we analyze the comprehensive effects of different policy strategies. Using the life cycle assessment method, an environmental benefit assessment model for airport waste classification and recycling is established to analyze the environmental benefits of different strategies and find the best strategy for the airport. The results show that implementing policy strategies can significantly change passengers’ waste disposal behavior and more than double their willingness to use green products. The combined strategy of the full-factor change scenario demonstrates a significant effect in optimizing the waste metabolism structure and recyclables disposal structure at the airport, with a 76.9 % increase in the use of green products relative to the BAU scenario. Through the implementation of the combined strategy, recyclable waste recycling can reduce 10.6 t CO₂e and 15.6 % of photochemical oxidant emissions, which is a significant environmental benefit.

{"title":"Environmental benefits of airport waste classification and recycling strategies: An analysis of behavior in multi-agent systems","authors":"Zixin Bian, Zhibo Zhao, Xinrui Guo, Yifan Gu, Yi Yi, Yuxian Hong, Mingxuan Tuo, Yihan Li, Yufeng Wu","doi":"10.1016/j.rcradv.2024.200239","DOIUrl":"10.1016/j.rcradv.2024.200239","url":null,"abstract":"<div><div>The classification and recycling of airport waste has become a key point in developing green airports. However, airport waste classification involves a large number of stakeholders. The influence factors are complex, and the interactions between the stakeholders are not clear. Based on the agent-based model, we sort out the behaviors and driving factors of the three main stakeholders, namely passengers, collectors, and managers, and construct a multi-agent system of airport waste classification and recycling with the coupling of the waste generation subsystem, the recycling subsystem and the strategy formulation subsystem. By the complex system, we analyze the comprehensive effects of different policy strategies. Using the life cycle assessment method, an environmental benefit assessment model for airport waste classification and recycling is established to analyze the environmental benefits of different strategies and find the best strategy for the airport. The results show that implementing policy strategies can significantly change passengers’ waste disposal behavior and more than double their willingness to use green products. The combined strategy of the full-factor change scenario demonstrates a significant effect in optimizing the waste metabolism structure and recyclables disposal structure at the airport, with a 76.9 % increase in the use of green products relative to the BAU scenario. Through the implementation of the combined strategy, recyclable waste recycling can reduce 10.6 t CO<sub>2</sub>e and 15.6 % of photochemical oxidant emissions, which is a significant environmental benefit.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"25 ","pages":"Article 200239"},"PeriodicalIF":5.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On statistical entropy measures in material flow analysis and their common framework 论物料流分析中的统计熵量及其通用框架

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-01 DOI: 10.1016/j.rcradv.2024.200237

Oliver Cencic, Helmut Rechberger

Statistical entropy (SE) is a method to quantify distributions of any metric. In material flow analysis, SE was initially applied to examine the distribution of a single chemical element over a set of material flows. This made it possible to quantify the entropy change caused by a process with respect to a single substance. However, using Shannon's SE equation in another way, SE can also be applied to the distribution of all substances within one specific material flow. This paper presents how these two approaches are actually connected and how the first can be derived from the second in a mathematically sound, straightforward way. Finally, we show how to compute the combined SE for a set of material flows with respect to several selected substances.

统计熵（SE）是一种量化任何指标分布的方法。在物料流分析中，统计熵最初被用于研究单一化学元素在一组物料流中的分布。这使得量化单一物质的过程所引起的熵变成为可能。然而，以另一种方式使用香农 SE 方程，SE 也可以应用于特定物质流中所有物质的分布。本文介绍了这两种方法之间的实际联系，以及如何以一种数学上合理、简单的方式从第二种方法推导出第一种方法。最后，我们还展示了如何计算一组物料流中几种选定物质的综合 SE。

引用次数: 0

Unraveling economic-environmental coupling in China's petrochemical industry towards carbon peaking 中国石化行业走向碳峰值的经济环境耦合分析

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-01 DOI: 10.1016/j.rcradv.2024.200236

Yingjie Liu , Hanbo Gao , Haoge Xu , Jinping Tian , Lyujun Chen

The petrochemical industry is a (key pillar) of chemical production and has relatively stable product demand in a long term, but it faces great decarbonization challenges due to the high energy consumption and complex industrial structure. To tackle this, a flow-land-infrastructure-petrochemical (FLIP) multi-factor model is developed with integration of material and energy flow analysis and decoupling assessment, targeting industrial carbon peaking via industrial structure upgrading and production efficiency improvement of four-digit level petrochemical sub-sectors. A nationally leading petrochemical industrial park was then selected to validate the model's effectiveness and robustness. Through the model optimization, the park could achieve 19 % and 30 % of CO₂e emission reductions in 2025 and 2030 respectively, compared with emissions in the scenario without intervention. The overall carbon productivity could rise by 89 % with a decoupling index of -0.15 between economic growth and carbon emissions during 2020–2030, showing a feasible carbon peaking pathway. Infrastructure with lock-in emissions needs energy system transformation and adjacent industrial symbiosis from a regional perspective, while promotion targets and entry thresholds of carbon productivity should be individually tailored for each stock and incremental manufacturing sub-industry. The model could be extended to other petrochemical clusters and emission-intensive industries, synergistically addressing the effects of structure upgrading and efficiency progress to support practical and economically sustainable carbon peaking pathway formulation.

石化行业是化工生产的（重点支柱），长期具有相对稳定的产品需求，但由于能耗高，产业结构复杂，面临着很大的脱碳挑战。为此，结合物能流分析和解耦评估，构建了流-陆-基建-石化（FLIP）多因素模型，以四位数石化细分行业为目标，通过产业结构升级和生产效率提升实现工业碳峰值。然后选取一个全国领先的石化工业园区来验证模型的有效性和稳健性。通过模型优化，与不干预情景相比，2025年和2030年，园区的二氧化碳排放量可分别减少19%和30%。2020-2030年，经济增长与碳排放的脱钩指数为-0.15，总体碳生产率可提高89%，显示出一条可行的碳峰值路径。碳排放锁定型基础设施需要从区域角度进行能源系统转型和相邻产业共生，碳生产率的提升目标和进入门槛应针对存量和增量制造子产业进行个性化定制。该模型可以推广到其他石化产业集群和排放密集型产业，协同解决结构升级和效率提升的影响，为制定切实可行、经济可持续的碳调峰路径提供支持。

{"title":"Unraveling economic-environmental coupling in China's petrochemical industry towards carbon peaking","authors":"Yingjie Liu , Hanbo Gao , Haoge Xu , Jinping Tian , Lyujun Chen","doi":"10.1016/j.rcradv.2024.200236","DOIUrl":"10.1016/j.rcradv.2024.200236","url":null,"abstract":"<div><div>The petrochemical industry is a (key pillar) of chemical production and has relatively stable product demand in a long term, but it faces great decarbonization challenges due to the high energy consumption and complex industrial structure. To tackle this, a flow-land-infrastructure-petrochemical (FLIP) multi-factor model is developed with integration of material and energy flow analysis and decoupling assessment, targeting industrial carbon peaking via industrial structure upgrading and production efficiency improvement of four-digit level petrochemical sub-sectors. A nationally leading petrochemical industrial park was then selected to validate the model's effectiveness and robustness. Through the model optimization, the park could achieve 19 % and 30 % of CO<sub>2</sub>e emission reductions in 2025 and 2030 respectively, compared with emissions in the scenario without intervention. The overall carbon productivity could rise by 89 % with a decoupling index of -0.15 between economic growth and carbon emissions during 2020–2030, showing a feasible carbon peaking pathway. Infrastructure with lock-in emissions needs energy system transformation and adjacent industrial symbiosis from a regional perspective, while promotion targets and entry thresholds of carbon productivity should be individually tailored for each stock and incremental manufacturing sub-industry. The model could be extended to other petrochemical clusters and emission-intensive industries, synergistically addressing the effects of structure upgrading and efficiency progress to support practical and economically sustainable carbon peaking pathway formulation.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"24 ","pages":"Article 200236"},"PeriodicalIF":5.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the recycling of plastic parts in household appliances–a review

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-01 DOI: 10.1016/j.rcradv.2024.200235

Jule Jeschonowski-Papstein , Lukas Gast , Markus Binding , Martin Faulstich

Household appliances account for a large proportion of the e-waste generated worldwide each year. Up to 75 % of this waste is currently incinerated or landfilled. The recycling industry focuses on harvesting valuable parts, like metals; however, household appliances are not only made of metals, but also recyclable plastics. This article reviews how the recycling of these plastics has developed since 2014 and which new approaches, such as ecodesign, currently are being pursued to promote the recycling of (plastic parts in) household appliances in the future. The findings of the present review paper show that the consideration of recycling is extending to the life cycle of products over time; however, a holistic approach is still lacking, and although problems such as the recycling of plastics containing flame retardants are known, the latter are still not being considered in the product development phase. Other challenges, which already existed 10 years ago, such as those posed by the illegal sector, are still in focus today. Conversely, there are many ideas, like material tracking, incentive systems or microfactory treatment, on how the recycling of (plastic from) household appliances can be improved in the future, which necessitate further research.

{"title":"Improving the recycling of plastic parts in household appliances–a review","authors":"Jule Jeschonowski-Papstein , Lukas Gast , Markus Binding , Martin Faulstich","doi":"10.1016/j.rcradv.2024.200235","DOIUrl":"10.1016/j.rcradv.2024.200235","url":null,"abstract":"<div><div>Household appliances account for a large proportion of the e-waste generated worldwide each year. Up to 75 % of this waste is currently incinerated or landfilled. The recycling industry focuses on harvesting valuable parts, like metals; however, household appliances are not only made of metals, but also recyclable plastics. This article reviews how the recycling of these plastics has developed since 2014 and which new approaches, such as ecodesign, currently are being pursued to promote the recycling of (plastic parts in) household appliances in the future. The findings of the present review paper show that the consideration of recycling is extending to the life cycle of products over time; however, a holistic approach is still lacking, and although problems such as the recycling of plastics containing flame retardants are known, the latter are still not being considered in the product development phase. Other challenges, which already existed 10 years ago, such as those posed by the illegal sector, are still in focus today. Conversely, there are many ideas, like material tracking, incentive systems or microfactory treatment, on how the recycling of (plastic from) household appliances can be improved in the future, which necessitate further research.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"24 ","pages":"Article 200235"},"PeriodicalIF":5.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Building sustainable community: Insight from successful waste management initiative

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-12-01 DOI: 10.1016/j.rcradv.2024.200238

Unruan Leknoi , Pisut Painmanakul , Nattawin Chawaloesphonsiya , Wuthiwong Wimolsakcharoen , Chadalak Samritthinanta , Annop Yiengthaisong

The global waste situation presents a significant challenge worldwide, especially in developing countries experiencing rapid economic development and urban growth. Waste separation for recycling is a recognized sustainable management method that overcomes budget limitations and the lack of advanced technology. However, promoting waste separation remains a challenging issue that requires learning from successful lessons to advance this agenda. This study examines a successful waste management initiative started by a community in response to a significant waste issue. It's a case study of a low-income community near Bangkok, Thailand. The study uses the theory of change to understand the community's success and the sustainable development goals (SDGs) to evaluate the sustainability of the waste management efforts. The study highlights how the community effectively addressed a significant waste problem that was negatively impacting water sources and causing pollution. The leadership of the community leader played a crucial role in implementing successful strategies, including developing diverse participation approaches to meet the needs of various community members. The community utilized the PDCA (Plan Do Check Act) cycle to drive progress, and the task force operated on a foundation of equality, fostering horizontal relationships, and distribute of incentives. The process of effecting change was described in line with the theory of change, resulting in a successful outcome. Ultimately, this study will offer valuable insights for low-income communities worldwide, empowering them to tackle waste issues and foster sustainability within their neighborhoods.

{"title":"Building sustainable community: Insight from successful waste management initiative","authors":"Unruan Leknoi , Pisut Painmanakul , Nattawin Chawaloesphonsiya , Wuthiwong Wimolsakcharoen , Chadalak Samritthinanta , Annop Yiengthaisong","doi":"10.1016/j.rcradv.2024.200238","DOIUrl":"10.1016/j.rcradv.2024.200238","url":null,"abstract":"<div><div>The global waste situation presents a significant challenge worldwide, especially in developing countries experiencing rapid economic development and urban growth. Waste separation for recycling is a recognized sustainable management method that overcomes budget limitations and the lack of advanced technology. However, promoting waste separation remains a challenging issue that requires learning from successful lessons to advance this agenda. This study examines a successful waste management initiative started by a community in response to a significant waste issue. It's a case study of a low-income community near Bangkok, Thailand. The study uses the theory of change to understand the community's success and the sustainable development goals (SDGs) to evaluate the sustainability of the waste management efforts. The study highlights how the community effectively addressed a significant waste problem that was negatively impacting water sources and causing pollution. The leadership of the community leader played a crucial role in implementing successful strategies, including developing diverse participation approaches to meet the needs of various community members. The community utilized the PDCA (Plan Do Check Act) cycle to drive progress, and the task force operated on a foundation of equality, fostering horizontal relationships, and distribute of incentives. The process of effecting change was described in line with the theory of change, resulting in a successful outcome. Ultimately, this study will offer valuable insights for low-income communities worldwide, empowering them to tackle waste issues and foster sustainability within their neighborhoods.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"24 ","pages":"Article 200238"},"PeriodicalIF":5.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Attitudes and preferences of the Chinese public towards products made from recycled materials: A text mining approach 中国公众对再生材料产品的态度和偏好：文本挖掘方法

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-10-20 DOI: 10.1016/j.rcradv.2024.200234

Heng Xu, Chong Tian

Products made from recycled materials, as an environmentally friendly option, have attracted public attention. Understanding public attitudes and preferences towards such products is crucial for their market development. In order to explore the Chinese residents’ attitude and emotional tendency, we analyzed public discussions and topics on products made from recycled materials from Sina Weibo. Meanwhile, LDA and BERT deep learning models were employed to assess the level of public attention, hot topics, and sentiment tendencies in China. Results show a significant upward trend in public interest in products made from recycled materials. Although the fact that most people have a positive attitude towards the environmental concept of products made from recycled materials and support such products, there is not a significant demand for products made from recycled materials, i.e., there is a green attitude-behaviour gap. Results further reveal that factors such as the price of products made from recycled materials, branding, and public skepticism about the sustainability of the products are the main reasons for the gap between environmental awareness and consumer behaviour. By analyzing the public's cognitive structure and psychological characteristics regarding products made from recycled materials through social media data, this paper can help recycling manufacturers understand consumers' needs and expectations, as well as assist policymakers in formulating better circular economy policies.

回收材料制成的产品作为一种环保选择，已经引起了公众的关注。了解公众对这类产品的态度和偏好对其市场发展至关重要。为了探究中国居民的态度和情感倾向，我们分析了新浪微博中关于再生材料产品的公众讨论和话题。同时，采用 LDA 和 BERT 深度学习模型来评估中国公众的关注程度、热点话题和情感倾向。结果显示，公众对再生材料产品的关注度呈明显上升趋势。虽然大多数人对再生材料制成的产品的环保理念持积极态度，并对此类产品表示支持，但对再生材料制成的产品的需求并不明显，即存在绿色态度-行为差距。研究结果进一步揭示，回收材料制成的产品的价格、品牌以及公众对产品可持续性的怀疑等因素是造成环保意识与消费者行为之间差距的主要原因。本文通过社交媒体数据分析了公众对回收材料制成的产品的认知结构和心理特征，有助于回收制造商了解消费者的需求和期望，也有助于政策制定者制定更好的循环经济政策。

{"title":"Attitudes and preferences of the Chinese public towards products made from recycled materials: A text mining approach","authors":"Heng Xu, Chong Tian","doi":"10.1016/j.rcradv.2024.200234","DOIUrl":"10.1016/j.rcradv.2024.200234","url":null,"abstract":"<div><div>Products made from recycled materials, as an environmentally friendly option, have attracted public attention. Understanding public attitudes and preferences towards such products is crucial for their market development. In order to explore the Chinese residents’ attitude and emotional tendency, we analyzed public discussions and topics on products made from recycled materials from Sina Weibo. Meanwhile, LDA and BERT deep learning models were employed to assess the level of public attention, hot topics, and sentiment tendencies in China. Results show a significant upward trend in public interest in products made from recycled materials. Although the fact that most people have a positive attitude towards the environmental concept of products made from recycled materials and support such products, there is not a significant demand for products made from recycled materials, i.e., there is a green attitude-behaviour gap. Results further reveal that factors such as the price of products made from recycled materials, branding, and public skepticism about the sustainability of the products are the main reasons for the gap between environmental awareness and consumer behaviour. By analyzing the public's cognitive structure and psychological characteristics regarding products made from recycled materials through social media data, this paper can help recycling manufacturers understand consumers' needs and expectations, as well as assist policymakers in formulating better circular economy policies.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"24 ","pages":"Article 200234"},"PeriodicalIF":5.4,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding sustainable consumption behavior: A systematic review of theories and models and provision of a guidance framework 解码可持续消费行为：对理论和模型的系统审查以及提供指导框架

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-10-10 DOI: 10.1016/j.rcradv.2024.200232

Shayaan Syed , Adolf Acquaye , Malik Mansoor Khalfan , Theresa Obuobisa-Darko , Fred Amofa Yamoah

Sustainable consumption behavior (SCB) has gained increasing importance in addressing global challenges such as climate change and resource depletion. This paper presents a systematic review of theories and models applied to understanding SCB. A total of 64 studies, published between 2012 and 2022, were analyzed, utilizing 14 theories, models and subjects to identify key drivers of SCB. Among the theories, the Theory of Planned Behavior (TPB) was the most frequently employed, with 29 studies, highlighting the influence of attitudes, subjective norms, and perceived behavioral control on sustainable consumption. Other prominent frameworks include Social Cognitive Theory (SCT), used in 5 studies, and the Value-Belief-Norm (VBN) Theory, applied in 4 studies. The review identified a trend toward expanding TPB to include factors such as altruism and environmental concern to better capture SCB's complexity. Moreover, models like the Diffusion of Innovation Theory (used in 4 studies) emphasize the role of innovation adoption in promoting sustainability. Key findings also suggest that while internal motivations (e.g., personal values, attitudes) strongly influence SCB, external factors like social norms and policy interventions also play a crucial role. A notable challenge is the gap between intention and actual behavior, with several studies emphasizing the need for multi-dimensional approaches that integrate psychological, social, and contextual factors. This review consolidates diverse approaches into a guiding framework for future SCB studies, emphasizing the importance of contextual nuances and interdisciplinary collaboration to foster sustainable consumer behaviors across various domains.

可持续消费行为（SCB）在应对气候变化和资源枯竭等全球性挑战方面的重要性与日俱增。本文对用于理解可持续消费行为的理论和模型进行了系统回顾。本文共分析了 2012 年至 2022 年间发表的 64 项研究，利用 14 种理论、模型和研究对象来确定 SCB 的关键驱动因素。在这些理论中，计划行为理论（TPB）最常用，共有 29 项研究，强调了态度、主观规范和感知行为控制对可持续消费的影响。其他著名的框架包括社会认知理论（Social Cognitive Theory，SCT）（5 项研究采用）和价值-信念-规范理论（Value-Belief-Norm，VBN）（4 项研究采用）。综述发现了一种趋势，即扩展 TPB，纳入利他主义和环境关注等因素，以更好地捕捉 SCB 的复杂性。此外，创新扩散理论（有 4 项研究采用）等模型强调了采用创新在促进可持续发展中的作用。主要研究结果还表明，虽然内部动机（如个人价值观、态度）对可持续发展委员会有很大影响，但社会规范和政策干预等外部因素也起着至关重要的作用。一个值得注意的挑战是意向与实际行为之间的差距，有几项研究强调需要综合心理、社会和环境因素的多维方法。本综述将各种不同的方法整合成一个指导框架，供未来的可持续消费行为研究使用，并强调了背景细微差别和跨学科合作对促进各领域可持续消费行为的重要性。

{"title":"Decoding sustainable consumption behavior: A systematic review of theories and models and provision of a guidance framework","authors":"Shayaan Syed , Adolf Acquaye , Malik Mansoor Khalfan , Theresa Obuobisa-Darko , Fred Amofa Yamoah","doi":"10.1016/j.rcradv.2024.200232","DOIUrl":"10.1016/j.rcradv.2024.200232","url":null,"abstract":"<div><div>Sustainable consumption behavior (SCB) has gained increasing importance in addressing global challenges such as climate change and resource depletion. This paper presents a systematic review of theories and models applied to understanding SCB. A total of 64 studies, published between 2012 and 2022, were analyzed, utilizing 14 theories, models and subjects to identify key drivers of SCB. Among the theories, the Theory of Planned Behavior (TPB) was the most frequently employed, with 29 studies, highlighting the influence of attitudes, subjective norms, and perceived behavioral control on sustainable consumption. Other prominent frameworks include Social Cognitive Theory (SCT), used in 5 studies, and the Value-Belief-Norm (VBN) Theory, applied in 4 studies. The review identified a trend toward expanding TPB to include factors such as altruism and environmental concern to better capture SCB's complexity. Moreover, models like the Diffusion of Innovation Theory (used in 4 studies) emphasize the role of innovation adoption in promoting sustainability. Key findings also suggest that while internal motivations (e.g., personal values, attitudes) strongly influence SCB, external factors like social norms and policy interventions also play a crucial role. A notable challenge is the gap between intention and actual behavior, with several studies emphasizing the need for multi-dimensional approaches that integrate psychological, social, and contextual factors. This review consolidates diverse approaches into a guiding framework for future SCB studies, emphasizing the importance of contextual nuances and interdisciplinary collaboration to foster sustainable consumer behaviors across various domains.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"23 ","pages":"Article 200232"},"PeriodicalIF":5.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A two-step approach to recycling hydroponics waste nutrient solutions using fertiliser drawn forward osmosis and chemical precipitation 利用肥料正向渗透法和化学沉淀法回收水培废弃营养液的两步法

IF 5.4 Q1 ENVIRONMENTAL SCIENCES

Resources, conservation & recycling advances

Pub Date : 2024-10-05 DOI: 10.1016/j.rcradv.2024.200233

Suhaib Malkawi , Dharmappa Hagare , Basant Maheshwari

Hydroponic waste nutrient solutions (HWNS) present significant environmental and economic challenges due to their high phosphorus content and potential for eutrophication. Addressing these issues requires innovative approaches that mitigate environmental impacts and recover valuable resources. This study introduces a novel two-step approach that combines Fertiliser Drawn Forward Osmosis (FDFO) and chemical precipitation to recycle HWNS effectively.

In the first phase, FDFO was employed to concentrate HWNS using a commercial hydroponic fertiliser as the draw solution. This process resulted in a diluted fertiliser solution (potentially suitable for reuse in hydroponics irrigation) and a concentrated HWNS rich in phosphorus. The concentrated HWNS was then subjected to chemical precipitation in the second phase, where phosphorus was recovered as calcium phosphate by adding sodium hydroxide at an optimised pH of 9.5.

Bench-scale experiments demonstrated a 93% water recovery rate using FDFO and an impressive 99.5% phosphorus removal efficiency through chemical precipitation. These results indicate that the combined FDFO and chemical precipitation processes effectively recover water and phosphorus from HWNS and reduce reliance on synthetic fertilisers and freshwater in hydroponic systems.

The findings of this study demonstrate that the two-step approach not only enhances water and phosphorus recovery but also improves the efficiency of the chemical precipitation process by achieving higher recovery rates resulting in more sustainable hydroponic systems.

水耕废料营养液（HWNS）由于含磷量高并可能造成富营养化，给环境和经济带来了巨大挑战。要解决这些问题，就必须采用创新方法，减轻对环境的影响并回收宝贵的资源。本研究介绍了一种新颖的两步法，该方法结合了肥料牵引正向渗透（FDFO）和化学沉淀法，可有效回收利用 HWNS。这一过程产生了稀释的肥料溶液（可能适合在水培灌溉中重复使用）和富含磷的浓缩 HWNS。然后，浓缩的 HWNS 在第二阶段进行化学沉淀，在最佳 pH 值为 9.5 的条件下加入氢氧化钠，以磷酸钙的形式回收磷。基准规模实验表明，使用 FDFO 的水回收率为 93%，通过化学沉淀的除磷效率为 99.5%，令人印象深刻。这些结果表明，FDFO 和化学沉淀相结合的工艺能有效回收 HWNS 中的水和磷，减少水培系统对合成肥料和淡水的依赖。这项研究的结果表明，两步法不仅能提高水和磷的回收率，还能提高化学沉淀工艺的效率，达到更高的回收率，从而实现更可持续的水培系统。

{"title":"A two-step approach to recycling hydroponics waste nutrient solutions using fertiliser drawn forward osmosis and chemical precipitation","authors":"Suhaib Malkawi , Dharmappa Hagare , Basant Maheshwari","doi":"10.1016/j.rcradv.2024.200233","DOIUrl":"10.1016/j.rcradv.2024.200233","url":null,"abstract":"<div><div>Hydroponic waste nutrient solutions (HWNS) present significant environmental and economic challenges due to their high phosphorus content and potential for eutrophication. Addressing these issues requires innovative approaches that mitigate environmental impacts and recover valuable resources. This study introduces a novel two-step approach that combines Fertiliser Drawn Forward Osmosis (FDFO) and chemical precipitation to recycle HWNS effectively.</div><div>In the first phase, FDFO was employed to concentrate HWNS using a commercial hydroponic fertiliser as the draw solution. This process resulted in a diluted fertiliser solution (potentially suitable for reuse in hydroponics irrigation) and a concentrated HWNS rich in phosphorus. The concentrated HWNS was then subjected to chemical precipitation in the second phase, where phosphorus was recovered as calcium phosphate by adding sodium hydroxide at an optimised pH of 9.5.</div><div>Bench-scale experiments demonstrated a 93% water recovery rate using FDFO and an impressive 99.5% phosphorus removal efficiency through chemical precipitation. These results indicate that the combined FDFO and chemical precipitation processes effectively recover water and phosphorus from HWNS and reduce reliance on synthetic fertilisers and freshwater in hydroponic systems.</div><div>The findings of this study demonstrate that the two-step approach not only enhances water and phosphorus recovery but also improves the efficiency of the chemical precipitation process by achieving higher recovery rates resulting in more sustainable hydroponic systems.</div></div>","PeriodicalId":74689,"journal":{"name":"Resources, conservation & recycling advances","volume":"23 ","pages":"Article 200233"},"PeriodicalIF":5.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0