Cleaner Waste Systems最新文献

{"title":"“Waste-to-Products” for the sustainability transformation of megacities: Case analysis of impacts of public knowledge and perception on chemical recycling deployment in Singapore","authors":"Roh Pin Lee ,&nbsp;Jochen Reb","doi":"10.1016/j.clwas.2025.100359","DOIUrl":"10.1016/j.clwas.2025.100359","url":null,"abstract":"<div><div>Megacities generate significant amounts of unsorted domestic waste. Rather than being landfilled/incinerated, this could be used to substitute fossil resources for chemical production via chemical recycling (CR). CR thus represents an opportunity for a parallel achievement of multiple sustainability goals from resource efficiency, decarbonization to circularity and sustainable waste management. However, as an emerging technology, its potential contributions to a nation’s sustainability transformation remain debated. While extant literature in the fields of waste management and CR have predominantly focused on waste sorting/segregation/collection as well as techno-economical-ecological feasibility of CR technologies respectively, insights into human factors which could hinder CR deployment in the forms of pyrolysis and gasification for the sustainable waste management in megacities remain lacking. To address this gap, this study implemented a representative online survey in Singapore – a megacity in Southeast Asia aiming to transit towards circularity and zero-waste by 2030 – and enabled first and novel insights into factors in the human dimension which would (1) influence proper waste separation/recycling behaviors – a prerequisite for the successful implementation of waste pyrolysis, and (2) impact societal support for using domestic waste for chemical production via waste gasification rather than for energy production via waste incineration – the dominant waste management approach in Singapore. Study insights regarding the impacts of the human factor and the identified opportunities for CR integration in a nation’s waste system – besides extending extant waste management and CR literature – furthermore act as a blueprint for sustainable waste management and green chemistry for the sustainability transformation of other megacities.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100359"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144702611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kiwi peel waste enhances manure protein degradation: Statistical optimization using Box-Behnken design and response surface methodology","authors":"Noori M. Cata Saady,&nbsp;Tasnia Hasan Nazifa","doi":"10.1016/j.clwas.2025.100382","DOIUrl":"10.1016/j.clwas.2025.100382","url":null,"abstract":"<div><div>Anaerobic digestion (AD) of protein-rich waste is challenged by ammonia accumulation. This study explores the potential of Kiwi peel waste (KPW)-derived proteases (actinidin) to enhance manure protein degradation. It used Box–Behnken response surface design to optimize the protein quantity and ammonia reduction in batch experiments. It studied the individual and interactive effects of the manure degradation parameters (manure dosage, KPW dosage, and time). The optimal manure protein quantity reduction (39 ± 0.54 %) was obtained at manure dosages of 4 g VS L⁻¹, KPW dosage of 7.5 g VS L⁻¹, and 48 h. However, the optimum conditions for reducing ammonia by 64 ± 0.65 % are manure dosage of 9 g VS L⁻¹, KPW dosage of 7.5 g VS L⁻¹, and 48 h. A highly predictive second-order polynomial model predicted reduction consistent with those observed experimentally (<em>R</em>² = 0.99). Change and decrease in FTIR peak intensity from 3200 to 3400 cm⁻¹ confirmed the disturbance of hydrogen bonds and the breaking of amide or N-H bonds within side chains in the hydrolyzed manure sample. The tests characterizing the hydrolyzed substrate and the statistical model data affirm that employing KPW for manure degradation is a feasible strategy to tackle ammonia buildup. This approach can potentially enhance protein degradation in manure and increase methane yield in AD. Future studies may explore the effects of using different types of manure or other slaughterhouse waste to understand the model’s viability on various protein-rich wastes. The stability of actinidin needs to be investigated under different environmental conditions, such as temperature, pH, nutrients, etc.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100382"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physico-mechanical characterization of recycled LDPE blended with EPS as a sustainable rigid alternative to polypropylene","authors":"F.S. Hassan ,&nbsp;W.U. Eze ,&nbsp;R. Umunakwe ,&nbsp;T. Oyegoke ,&nbsp;M.I. Uzochukwu","doi":"10.1016/j.clwas.2025.100383","DOIUrl":"10.1016/j.clwas.2025.100383","url":null,"abstract":"<div><div>The accumulation of plastic waste, particularly low-density polyethylene (LDPE) and expanded polystyrene (EPS or Styrofoam), presents a growing environmental challenge due to their widespread use and limited biodegradability. In resource-constrained regions like Nigeria, uncompatibilized recycling of LDPE/EPS waste offers a low-cost path to valorize plastic pollution. Addressing this issue requires innovative recycling strategies that can transform waste into valuable materials. This study developed an uncompatibilized sustainable polymer blend from post-consumer waste and investigated the physical and mechanical properties of recycled LDPE blended with EPS under resource-constrained conditions as a sustainable rigid alternative to polypropylene (PP) for static applications, though trade-offs in impact resistance were observed. In achieving this, triplicate samples were statistically validated (ANOVA, p &lt; 0.05), LDPE/EPS blends were prepared in varying weight ratios (80/20, 75/25, 70/30, 65/35, and 60/40) using a two-roll mill and compression molding. A series of tests; density, tensile strength, elongation at break, tensile modulus, flexural strength, hardness, and impact resistance; were conducted on triplicate samples, with results expressed as mean ± standard deviation. In the study, the 60/40 blend achieved a tensile modulus of 202 MPa (surpassing PP's 179 MPa) but exhibited 39 % lower impact strength than PP (0.20 vs. 0.33 J/mm²). However, increasing EPS content reduced elongation at break, indicating increased brittleness due to EPS's rigidity, though flexural strength (23.77 MPa) remains 56 % lower than PP (53.59 MPa), restricting load-bearing use. Findings validated suitability for rigid, static applications. Beyond performance, the blend contributes to plastic waste reduction and supports circular economy initiatives by transforming problematic waste materials into functional products.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100383"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of cement paste properties using seawater: Early-age behavior, mechanical and microstructural analysis","authors":"Shekhar Saxena,&nbsp;Mohammad H. Baghban","doi":"10.1016/j.clwas.2025.100407","DOIUrl":"10.1016/j.clwas.2025.100407","url":null,"abstract":"<div><div>Freshwater scarcity is an increasing challenge for the construction industry, which uses large volumes of potable water for concrete production. This study evaluates seawater as a sustainable alternative to tap water in cement paste, focusing on fresh properties, mechanical performance, and microstructural characteristics. Results showed that seawater accelerated hydration, with the peak heat flow reaching 3.42 mW/g at 9 h compared to 2.45 mW/g at 11 h for tap water, and reduced initial setting time by ∼60 min. Early-age strengths improved substantially, with compressive and flexural strengths increasing by 49.6 % and 46.4 % at 1 day, respectively, although 28-day strengths declined (-2.3 % compressive, −22.4 % flexural). XRD confirmed Friedel’s salt formation in seawater specimens, while SEM-EDS revealed higher chloride-bound phase and a greater presence of micropores in seawater paste. CT scanning quantified a higher void volume fraction in seawater paste (1.16 %) than in tap water paste (0.67 %). The integration of quantitative setting time and heat of hydration data with strength measurements, and their linkage to porosity characteristics derived from SEM–EDS and the relatively less explored CT analysis in this context, establishes a coherent microstructure-to-property framework. This combined approach paves the way for sustainable and time-efficient construction, with challenges in workability and durability mitigated by careful scheduling and admixture use.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100407"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable solutions with AHP, reliability, and HAN-fuzzy sensitivity analysis for landfills in Saudi Arabia","authors":"Saidur Rahman Chowdhury ,&nbsp;Zainab H.A. Alnaser ,&nbsp;Ikrema Hassan ,&nbsp;Sani I. Abba","doi":"10.1016/j.clwas.2025.100419","DOIUrl":"10.1016/j.clwas.2025.100419","url":null,"abstract":"<div><div>Landfills in arid and hot regions pose unique challenges due to accelerated decomposition rates and heightened risks of environmental contamination. This study explores the processes, treatment methods, and design considerations critical for managing waste in such extreme environments. Focusing on Saudi Arabia as a case study, the analysis highlights the need for climate-specific solutions to improve the design and operational efficiency of landfills. To identify key sustainability drivers, a hybrid sensitivity framework combining the Analytic Hierarchy Process (AHP) and a Hybrid Adaptive Neuro-Fuzzy Inference System (HAN-Fuzzy) was employed. AHP-derived weights ranged from 0.07 to 0.43, reflecting expert prioritization of variables such as resource reservoir (RR), design, construction &amp; maintenance costs (DS and M&amp;O), and site selection (SS). In contrast, HAN-Fuzzy revealed that RR was the most influential variable (RMSE = 3.29 × 10⁻⁶), followed by DS and M&amp;O (RMSE = 2.20 × 10⁻⁵) and SS (RMSE = 3.28 × 10⁻⁵), illustrating a notable divergence between expert perception and data-driven impact. The findings underscore the importance of aligning strategic planning with both stakeholder input and empirical sensitivity outputs. The study offers actionable insights for policymakers, landfill operators, and environmental engineers seeking to optimize waste management in arid regions. Future directions include incorporating predictive modeling, advanced biodegradation technologies, and stakeholder engagement frameworks, all in alignment with Saudi Arabia’s Vision 2030 goals for sustainable resource use and environmental resilience.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100419"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145265146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel zero-waste baselining for mine water wastage quantification","authors":"Marco le Roux,&nbsp;Jean van Laar,&nbsp;Deon Arndt,&nbsp;Corne Schutte","doi":"10.1016/j.clwas.2025.100358","DOIUrl":"10.1016/j.clwas.2025.100358","url":null,"abstract":"<div><div>Deep-level mines require complex chilled water reticulation systems to maintain regulated underground temperatures. These systems are energy-intensive and prone to wastage. Several methods exist for identifying and quantifying this wastage, although these methods often underrepresent the wastage present. Zero-waste baselining is a technique that can identify a system's complete scope of wastage. Currently, the methods used to develop zero-waste baselines are simplistic, resulting in wastage not being identified and not accounting for operational downtime of the considered equipment. A need exists for a zero-waste baselining method to establish the zero-waste demand more accurately. A novel zero-waste baselining method is proposed to address this need. The proposed method develops novel equations for determining flow demand during the drilling and cleaning shifts. The proposed method was applied to a case study, which identified a wastage of 54 L/s (32 % of the total flow). In comparison, the current zero-waste baselines overestimated the demand and identified only 28 L/s of wastage which is 48 % less than the proposed novel method. Further studies could incorporate the missing person locator system to scale water usage more granularly.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100358"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A brief review of earth materials stabilization","authors":"Imane Bouchefra ,&nbsp;Hafida Er-rradi ,&nbsp;Fatima Zohra El Wardi ,&nbsp;Hassan Chehouani ,&nbsp;Brahim Benhamou","doi":"10.1016/j.clwas.2025.100345","DOIUrl":"10.1016/j.clwas.2025.100345","url":null,"abstract":"<div><div>Over the past few years, there has been a significant increase in demand for ecological building materials aimed at minimizing environmental footprints and requiring low energy. In this context, earth construction materials have received a growing attention for their low environmental impact and availability. For thousands of years, fibers and chemical stabilizers have reinforced earth materials to improve their properties, although scientific investigations into this practice only began recently. The present study provides a comprehensive assessment of the latest investigations on the effect of incorporating fibers and stabilizers on the properties of earth building materials such as adobe, rammed earth and compressed earth bricks. The effect of cement, lime and alternative mineral bender additions on the mechanical and thermophysical properties of earth building materials was studied. Moreover, the impact of type, length and treatment of fibers was also studied. This paper offered a comprehensive analysis of the most recent studies regarding how the addiction of fibers and stabilizers affects the properties of earth bricks. The ultimate goal is to support scientists and practitioners in producing earth building materials with high performance.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100345"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Valorization of oil palm fiber waste into mesoporous silica for selective removal of heavy metals from industrial wastewater","authors":"Siti Salamah ,&nbsp;Totok Eka Suharto ,&nbsp;Ilham Mufandi ,&nbsp;Zian Prizki Utama ,&nbsp;Muhammad Hikmal Firdausya","doi":"10.1016/j.clwas.2025.100401","DOIUrl":"10.1016/j.clwas.2025.100401","url":null,"abstract":"<div><div>The increasing need for sustainable waste management and circular material use has encouraged research into converting agricultural residues into high-value functional materials. This study explores the valorization of oil palm fiber (OPF) waste for the production of mesoporous silica through sequential acid-alkali treatment and thermal calcination at 500 °C and 600 °C. The optimized silica synthesized at 600 °C exhibited a surface area of 138.3 m²/g and a pore diameter of 16.4 nm, indicating a mesoporous structure favorable for adsorption. Characterization using FTIR and XRF confirmed the presence of silanol and siloxane groups with low impurity levels. Adsorption performance was evaluated using industrial wastewater from silver processing, targeting copper (Cu²⁺) and silver (Ag⁺) removal. Results demonstrated high selectivity for Ag⁺, achieving 99.8 % removal, while Cu²⁺ showed limited uptake. SEM–EDX mapping confirmed the presence and distribution of metal ions on the silica surface. This study highlights the potential of OPF-derived silica as a low-cost, eco-friendly adsorbent, contributing to both waste valorization and heavy metal remediation within a cleaner production framework.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100401"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144931788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The recycling chain of post-consumer glass in the coal region of southern Brazil and the behavior of all stakeholders","authors":"Gláucia Cardoso de Souza-Dal Bó ,&nbsp;Viviane Kraieski Assunção ,&nbsp;Adriano Michael Bernardin","doi":"10.1016/j.clwas.2025.100350","DOIUrl":"10.1016/j.clwas.2025.100350","url":null,"abstract":"<div><div>In Brazil, 66.6 million t/year of municipal solid waste (MSW) are collected, and 48.2 million t/year are disposed of in landfills. The distance between the generating sources and the recycling centers makes it challenging to establish reverse routes, particularly for glass waste, which is a fragile material with low apparent density. Of the 37 % of the Brazilian MSW that are recycled, the recycling rate of glass waste is only 47 %, compared to 50 % worldwide. This work is a case study aimed at understanding the flow of vitreous waste and the behavior of the interested parties in South Brazilian cities, considering the informality of the recycling chain in developing countries. The data collection was made by interviews, complemented with bibliographic data from municipal agencies. Twenty-two players were identified in the recycling chain, and ten were interviewed. The glass chain shows a small number of members, and the reuse of post-consumer glass in the region has two destinations: ceramic industries at a regional level and the production of packaging at a national level. The discarded glass is collected by individual collectors, who sell it at a negligible price to intermediaries. The small collectors promote the reuse and recycling of glass waste. The problems pointed out regarding the recycling of glass waste are the low profitability of this material and the monopoly established between the intermediaries and the recycling companies. As a result, the circularity of the glass waste in developing countries requires the organization and regulation of the activities of the small collectors. Local companies can use recycled glass waste as secondary inputs in their products, effectively optimizing the recycling routes. In the case of the south region of the Santa Catarina state, Brazil, the ceramic tile industry proved to be a viable alternative for post-consumer glass disposal.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100350"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Social learning, public participation and community engagement in waste management: A bibliometric analysis of trends and gaps","authors":"Rony Sandra Yofa Zebua ,&nbsp;Sunarti ,&nbsp;Andi Wahyudi ,&nbsp;Istiana Hermawati ,&nbsp;Wisber Wiryanto ,&nbsp;Asmadi Adnan ,&nbsp;Caecilia Suprapti Dwi Takariani ,&nbsp;Alhadi Saputra ,&nbsp;Zaenal Abidin","doi":"10.1016/j.clwas.2025.100411","DOIUrl":"10.1016/j.clwas.2025.100411","url":null,"abstract":"<div><div>Public participation is a key to a successful municipal waste management (MWM) system, but making it sustainable remains challenging. Social learning is one potential solution to improve and sustain public participation, as it encourages the community to become more engaged in the program through a collaborative process involving diverse actors. However, previous studies paid little attention to this topic. This study aimed to provide evidence on the development of studies on public participation and community engagement in waste management, and to further investigate the studies on social learning within collaborative systems for the public participation. It employed bibliometric analysis, utilizing the public participation ladder by Arnstein, social learning theory, and the collaborative governance model as the analytical framework. Using two tools, Visualization of Similarities viewer (VOSviewer) and Biblioshiny, this study mapped the metadata and analyzed 140 selected documents through a systematic search of the Scopus database. This study revealed some insights. First, public acceptance and identification of behavioral determinant factors have been a consistent main topic of studies, especially in developing countries, indicating a low level of participation as the focus of prior studies. In contrast, an active partnership with the government and other stakeholders throughout the planning and decision-making processes is expected to be the primary focus. Second, only a limited number of studies on waste management have analyzed the collaborative dynamic interaction and social learning process more closely in developed country contexts. Studies on other crucial aspects of collaborative governance, such as organizational design and facilitative leadership, are also lacking, despite their importance for social learning in collaborative governance. More comprehensive studies were required to be explored in future studies, including the starting conditions as an enabler of the collaborative process. This study is a novel investigation that employs a bibliometric analysis to visualize the growth of studies in the public participation context of waste management. The findings contribute, both theoretically and practically, in waste management field by providing future research directions and offering insights for policymakers, NGOs, and other relevant stakeholders to develop collaborative strategies that enhance public participation sustainability.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"12 ","pages":"Article 100411"},"PeriodicalIF":3.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}