Cleaner Waste Systems最新文献

英文中文

Experimental evaluation on the cyclic behavior of reclaimed asphalt pavement (RAP) as railway tracks subballast

Cleaner Waste Systems

Pub Date : 2025-02-19 DOI: 10.1016/j.clwas.2025.100240

Seyed Elyas Hashemian , Fereidoon MoghadasNejad , Morteza Esmaeili

The repetitive loading in railway tracks and the passage of high-speed trains lead to amplifying structural and vibrational effects at different levels of the railway structure. The damaging compound effects on the ballast and subgrade have motivated the use of suitable and beneficial materials in the railway structure. Reclaimed asphalt pavement (RAP) mixtures are sustainable materials that could address the mentioned issues when used in railway tracks. This study investigated the reclaimed asphalt pavement (RAP) mixtures cyclic behavioral as railway tracks subballast. For this purpose, RAP100 % materials (one layer consisting of 100 % recycled asphalt materials`) were utilized. To determine the optimum subballast layer thickness, 5, 10, 15, and 20 cm thicknesses were examined using the ballast box test (BBT) under 100 thousands cycles of vertical loading. To account for the effects of ballast feature on the subballast, two ballast gradations (fine and coarse) were used in sample preparation. Comparison of settlement, stiffness, and damping of the arrangements showed that the best performance was related to the structure with fine ballast and 20 cm thick RAP100 % subballast, which decreased the track settlement by about 70 % and increased the ballast layer stiffness and damping by 138 % and 233 %, respectively. Although extensive non-structural aspects could be investigated in this issue, it seems that this layer with the mentioned thicknesses could be used as a straightforward constant strategy to enhance track stiffness and vibrational performance of railway tracks, especially high-speed tracks in comparison to common subballast granular layer.

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引用次数: 0

Recent advances in urban mining technology: A focus on electronic waste recycling potential in Indonesia

Cleaner Waste Systems

Pub Date : 2025-02-18 DOI: 10.1016/j.clwas.2025.100239

Mochamad Lutfi Firmansyah , Intan Nurul Rizki , Nisar Ullah

The rapid rise in electronic device production and the insufficiency of current recycling systems have led to generation of electronic waste (e-waste) that is considered a pressing global problem. This article reviews the advancements in urban mining technology and the prospects of e-waste recycling in Indonesia. It highlights the potential of urban mining as cost-effective and environmentally friendly alternatives to traditional mining, potentially reducing production costs for certain metals by up to 13-fold. These methods can undeniably produce metals like aluminum, copper, and gold at competitive costs as compared to conventional mining. Recent progress in biohydrometallurgy exploits the power of microorganisms to extract metals from e-waste, further enhancing the sustainability of recycling processes. Despite the challenges in e-waste management, it is indisputable that Indonesia has the potential to recover metals valued at up to 4.8 billion USD by 2025. As Indonesia experiences rapid urbanization, there's unwavering potential for urban mining to recycle and extract valuable elements, such as rare earth elements, from e-waste. Moreover, for a successful implementation of urban mining in Indonesia, it is necessary to make substantial investments in research, expand infrastructure, enhance capacity building, and establish supportive policies and regulations specifically designed for this developing industry. It is undeniable that advancing technology and tailored urban mining strategies can improve e-waste management, thereby unquestionably contributing to environmental sustainability and economic growth.

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引用次数: 0

Assessing the combustion behaviors and kinetics of municipal solid waste in Malang City, Indonesia: Parametric analysis for sustainable energy nexus

Cleaner Waste Systems

Pub Date : 2025-02-18 DOI: 10.1016/j.clwas.2025.100237

Sukarni Sukarni , Lina Bachrotul Hidayah , Ahmad Yusril Aminullah , Muhammad Shahbaz

This study investigated the essential combustion behavior of Malang City’s municipal solid waste (MSW) and its kinetic parameters. The effect of non-isothermal heating on the mass loss was investigated using a thermal analyzer at 10, 20, 30, and 40 °C/min heating rates. The apparent activation energies were examined using the isoconversional method of Flynn-Wall-Ozawa (FWO) and Vyazovkin, and the reaction order was determined using the Avrami theory. The results indicated that the MSW decomposed in three stages during non-isothermal heating, and the overall temperature for initial decomposition, the temperature at which the maximum mass loss rate occurs, and the temperature of burnout all increased with an escalating heating rate. The mean activation energies calculated by FWO and Vyazovkin for the second stage were 165.50 and 164.52 kJ/mol, respectively. In that order for the third stage, the mean activation energies were 127.76 and 122.46 kJ/mol. These findings have substantial significance in the effort to provide sustainable energy, considering the large amount of MSW that remains untapped. They will also be helpful in the development of a power generation reactor design through MSW that is better suited to the thermal characteristics of the samples, given that the MSW combustion process involves a complex reaction mechanism.

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引用次数: 0

Optimizing Green Lean Six Sigma using Industry 5.0 technologies

Cleaner Waste Systems

Pub Date : 2025-02-17 DOI: 10.1016/j.clwas.2025.100234

Imane Boumsisse, Mariam Benhadou, Abdellah Haddout

In a context where environmental sustainability and operational excellence are strategic imperatives, this study investigates the concrete integration of Industry 5.0 technologies into the Green Lean Six Sigma (GLSS) DMAIC cycle to improve the sustainability and efficiency of production processes. A structured theoretical framework is proposed, systematically mapping the application of Industry 5.0 technologies across the DMAIC phases (Define, Measure, Analyze, Improve, and Control). While primarily theoretical, the study discusses practical implications for manufacturing practices and identifies pathways for future empirical validation through case studies and pilot implementations. This innovative framework bridges advanced technologies with Green Lean Six Sigma methodologies to achieve sustainable operational excellence.

引用次数: 0

Multifunctional carbonaceous materials derived from tea waste: Towards sustainable solutions for wastewater treatment and hydrogen evolution

Cleaner Waste Systems

Pub Date : 2025-02-16 DOI: 10.1016/j.clwas.2025.100233

Amrutha Thomas , Nisha T. Padmanabhan , E.J. Jelmy , Pramod Gopinath , Honey John

The depletion of conventional energy sources and the alarming rise in water contamination underscore the urgent need for advanced materials that can simultaneously address wastewater treatment and hydrogen evolution reactions (HER). While existing materials offer solutions to either wastewater treatment or HER, multifunctional materials have been developed to address both challenges concurrently. Biomass-derived carbonaceous materials, particularly from abundant and sustainable sources like tea waste, present an environmentally friendly, cost-effective solution. This study presents novel, multifunctional nanomaterials derived from tea waste via facile synthesis method including KOH activation of tea waste ashes (GCW), microwave-assisted carbonization (GCOM), and hydrothermal modification (GCOH) of GCW to create materials capable of efficient dye adsorption and excellent HER activity. The FESEM, TEM, XRD, FTIR, Raman spectroscopy, TGA, BET, the XPS techniques were employed to thoroughly examine the morphological and structural properties of the materials. Among the synthesized materials, hydrothermally treated one (GCOH) after KOH activation of tea waste ashes demonstrated the highest adsorption capacity. Specifically, it showed values of 48 mg/g for the cationic dye Methylene Blue (MB) and 43 mg/g for the anionic dye Methyl Orange (MO). Additionally, GCOH exhibited excellent HER activity in an acidic medium, with an onset overpotential of 349 mV (466 mV at 50 mA cm⁻²) and a lower Tafel slope of 128 mV dec⁻¹. These findings suggest that biomass-derived carbonaceous materials, particularly from tea waste, can serve as dual-functional agents, offering a sustainable approach to addressing critical environmental and energy challenges.

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引用次数: 0

Correlation between global warming mitigation knowledge, attitudes, and community behavior in mangrove forests in Langsa City, Indonesia

Cleaner Waste Systems

Pub Date : 2025-02-15 DOI: 10.1016/j.clwas.2025.100238

Fitria Mustika , Dwiyono Hari Utomo , I.Komang Astina , Singgih Susilo

Mangrove forest destruction in Langsa City is caused by land conversion into ponds and illegal logging for charcoal production. Knowledge of global warming mitigation through mangrove conservation and rehabilitation is important for the community to have a positive and environmentally friendly attitude. The study aims to: (1) evaluate community knowledge about global warming mitigation through mangrove conservation and rehabilitation, (2) analyze the relationship between the attitudes and behavior of people living near mangrove forests, and (3) examine the relationship between knowledge, attitudes, and behavior of people living near mangrove forests. The study was conducted in Cinta Raja and Kuala Langsa Villages using a quantitative correlational design approach. The research population was the entire local community; samples were taken by purposive sampling based on data collection activities through structured interviews, observations, and documentation. The results of the study showed that the variable of community attitudes towards mangrove forests was in the good category (77 %), while mitigation knowledge (69 %) and conservative behavior (67 %) were in the moderate category. Positive attitudes were strongly correlated with conservative behavior and had a significant effect, while knowledge played a role in shaping attitudes but did not directly influence behavior. Therefore, increasing knowledge is a strategic step to strengthen mangrove conservation efforts.

Contribution

Increasing knowledge of global warming mitigation can strengthen positive attitudes and encourage conservative behavior among people in mangrove forests. It is recommended to increase education, socialization, support from local organizations, and mangrove conservation and rehabilitation practices to support global warming mitigation.

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引用次数: 0

An overview of residential food waste recycling initiatives in Japan

Cleaner Waste Systems

Pub Date : 2025-02-15 DOI: 10.1016/j.clwas.2025.100232

Ana Catarina Morais , Akira Ishida

Climate change mitigation has become a focal point in governmental agendas across the world, including in Japan. As the amount of food waste produced is a big concern of Japanese authorities, this paper presents an overview of the local initiatives currently existing in Japan to foster household food waste recovery systems, highlighting their main differences and similarities in terms of system design and marketing strategy. Additionally, a Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis on compost return systems, that are an endemic Japanese food recovering cycle is done. Japanese municipalities seem to always have some kind of residential food waste recycling system being advertised to their residents, being that a centralised, a decentralised, or a hybrid compost return system. Centralised segregation schemes are a rarer approach, with only few municipalities offering this type of food recycling setup. On the other hand, more than a half of the municipalities subsidises the households’ purchase of a composting technology. Hybrid solutions in which consumers compost and return the final output can be a compromise solution between centralised and decentralised schemes with possible positive spillover effects in other consumers’ pro-environmental behaviours.

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引用次数: 0

Ensemble machine learning algorithms for efficient prediction of compressive strength of concrete containing tyre rubber and brick powder

Cleaner Waste Systems

Pub Date : 2025-02-14 DOI: 10.1016/j.clwas.2025.100236

David Sinkhonde , Tajebe Bezabih , Derrick Mirindi , Destine Mashava , Frederic Mirindi

In order to increase the efficiency of predicting concrete compressive strength, ensemble machine learning (ML) algorithms are required. Considering that each ML algorithm continuously varies in methodology, one ML algorithm cannot generate exhaustive prediction results since limited parameters are available to tune. This research serves as a beginning step towards predicting the compressive strength of concrete containing waste tyre rubber (WTR) and clay brick powder (CBP) using artificial neural network (ANN), random forest (RF), decision tree (DT) and support vector machine (SVM) algorithms. Taylor diagram model analysis shows that when the four algorithms are compared, the SVM (train) model demonstrates the highest performance in predicting the compressive strength of concrete containing CBP and WTR. The R² values ranging from 0.60 – 0.97 imply that all the models fairly predict the compressive strength of concrete containing CBP and WTR. The same predictive abilities are demonstrated by the clustering of the data points for train and test models around the y = x line. It is shown that the majority of the data points lie within the error lines range of −20 and + 20 %. The SHapley Additive exPlanations (SHAP) analysis reveals that WTR has the highest impact on model predictions with a mean SHAP value of 3.83, while cement shows a moderate influence with a mean SHAP value of 0.77. Moreover, these findings suggest that WTR content is the most critical factor in controlling the concrete's compressive strength, while cement content plays a supporting role in the mixture design. Since the prediction behaviour of concrete using ML models is governed by the replacement levels of CBP and WTR, the models used in this study can be extended to the concrete mixes containing other waste materials.

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引用次数: 0

Methane hotspots in landfills: A systematic review on transboundary dispersion and impacts on heatwaves in South Asia

Cleaner Waste Systems

Pub Date : 2025-02-14 DOI: 10.1016/j.clwas.2025.100235

Mohammad Toha , Tasrif Nur Ariyan , Mahbub Alam

Sudden changes in heatwave patterns have become a significant health concern for the inhabitants of South Asian Countries (SACs) since 2020. While this abnormal phenomenon indicates a rapidly increasing trend of greenhouse gases (GHGs), awareness and understanding of the issue remain limited in most SACs. This systematic review aims to identify potential methane hotspots in landfill sites across SACs and assess the impact of methane emissions on regional heatwaves. Based on existing research, 44 potential methane hotspots were identified in landfill sites across SACs, with most sites located in India, Pakistan, and Bangladesh. The observed methane emissions ranged from 41.41 to 1.48 Gg/year in India, 55.93–0.27 Gg/year in Pakistan, and 25.95–24.97 Gg/year in Bangladesh. This study also revealed that a significant volume of methane is dispersed transboundary, affecting Afghanistan, Nepal, and Bhutan due to emissions originating from neighboring countries, including Pakistan, Iran, Turkmenistan, India, and China. Notably, a positive correlation (p < 0.05, R² = 0.77) was found between methane concentrations in SACs (India, Pakistan, and Bangladesh) and rising heatwave temperatures. Lastly, given the significant energy potential of landfill sites in SACs, this study recommends implementing waste-to-energy plant technology as a strategic approach to achieve Sustainable Development Goal 7 (SDG-7).

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引用次数: 0

Prospects of warm mix asphalt in maximizing reclaimed asphalt pavement utilization: Review on mix design and performance

Cleaner Waste Systems

Pub Date : 2025-02-13 DOI: 10.1016/j.clwas.2025.100229

K.M. Arun Sagar , Veena Venudharan , Gourab Saha

Over the last decade, pavement engineers have been in search of technology to incorporate a maximum percentage of Reclaimed Asphalt Pavement (RAP) into the mix. The production of Warm Mix Asphalt (WMA) at a lower temperature than Hot Mix Asphalt (HMA) gained the popularity of WMA-RAP technology due to its workability and reduced cost of construction. Although both WMA and RAP possess certain limitations as standalone technologies, their integration into WMA-RAP technology presents the possibility of mitigating the drawbacks associated with each when utilized jointly, particularly enhancing the performance of the WMA-RAP technology. The objective of this manuscript is to review and organize the information related to the high RAP incorporation in WMA technologies. The scope of the review is to understand the behavior of the WMA-RAP mixes and their performance all over the world. The laboratory and field evaluation of WMA-RAP mixes summarizes positive feedback on using high RAP in WMA. However, the possibility of utilizing a higher percentage of RAP content in the field and batch plant-level studies needs to be conducted to accurately assess the suitability. This manuscript is expected to aid pavement engineers in the development of WMA-RAP mixes with higher quantities of RAP content.

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引用次数: 0

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