Cleaner Waste Systems最新文献

{"title":"Food waste separation intention among the residential students: Moderation role of university support","authors":"Kelvin Yong Ming Lee ,&nbsp;Pick-Soon Ling ,&nbsp;Liing-Sing Ling ,&nbsp;Yi Shen ,&nbsp;Gwendolyn Huei Ming Chiu ,&nbsp;Xiao-Yan Phang","doi":"10.1016/j.clwas.2024.100174","DOIUrl":"10.1016/j.clwas.2024.100174","url":null,"abstract":"<div><div>The university has made efforts to promote campus sustainability by encouraging food waste separation among residential students. However, the effect of university support on students' behavioural intentions in this context remains understudied. Moreover, the evidence regarding residential students’ food waste separation intention is relatively deficient compared to other study contexts. To address these gaps, this study aims to achieve two objectives: (1) to investigate the constructs affecting residential students to separate food waste, and (2) to study the moderating effect of university support on the proposed relationships. A novel research framework which integrates environmental knowledge and moral norms into the theory of planned behaviour model, together with the university support as moderator, has been proposed. Primary data from 191 residential students in Malaysia were collected through purposive sampling and analysed using partial least squares structural equation modelling. The study’s findings revealed that students’ intentions to separate food waste are influenced by attitude, subjective norms, perceived behavioural control, and moral norms. Besides, the moderation analysis confirmed that university support significantly strengthen the relationship between attitude and intention to separate food waste in the university context. This finding offered valuable theoretical contributions regarding the moderation role of university support and provides practical implications for promote positive food waste behaviours among residential students.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100174"},"PeriodicalIF":0.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532600","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}

{"title":"Adding barium sulfate (BaSO4) to fly ash geopolymer increases its compressive strength as X-ray shielding for medical imaging applications","authors":"Ammar A. Oglat ,&nbsp;Sabri M. Shalbi ,&nbsp;Mohammed Suhimi","doi":"10.1016/j.clwas.2024.100175","DOIUrl":"10.1016/j.clwas.2024.100175","url":null,"abstract":"<div><h3>Background</h3><div>Geopolymers, a novel cementitious material, have the potential for reducing carbon dioxide wastes resulting from the manufacture of cement.</div></div><div><h3>Purpose</h3><div>This study presents an experimental inquiry conducted to produce a fly ash geopolymer mortar with a good of compressive strength of the batch.</div></div><div><h3>Methods</h3><div>Activation of the mortar is accomplished through the use of sodium hydroxide and sodium silicate. The mortar is created from a mixture of fly ash and sand. In order to determine the maximum load that a material is capable of bearing before experiencing failure, the compressive strength test was utilized.</div></div><div><h3>Results</h3><div>According on the findings of the compressive strength testing device, the fly ash geopolymer with 15 % barium sulfate (BaSO4) demonstrates the highest compressive strength, which is measured at 56 MPa. When compared to the results obtained from cement mortar, this one is twice as high, which indicates that the strength improvement factor is 2. This study's findings highlighted the necessity of employing fly ash geopolymer that contains 15 % BaSO4 for the purpose of providing shielding protection. Conclusion: Therefore, in terms of its performance, fly ash geopolymer is superior to cement mortar. This is due to the fact that it is manufactured with a high compressive strength.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100175"},"PeriodicalIF":0.0,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445374","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}

{"title":"Different aspects of biochar addition on semi-dry anaerobic digestion of organic fraction of municipal solid waste in continuous mode","authors":"Ahmad Reza Salehiyoun ,&nbsp;Hamid Zilouei ,&nbsp;Omid Norouzi ,&nbsp;Francesco Di Maria ,&nbsp;Saeid Mofatteh ,&nbsp;Mohammad Safari","doi":"10.1016/j.clwas.2024.100171","DOIUrl":"10.1016/j.clwas.2024.100171","url":null,"abstract":"<div><div>This study investigated the use of biochar, derived from a wood gasifier, in semi-dry anaerobic digestion of organic fraction of municipal solid waste (OFMSW). The experiment was conducted in three phases, without biochar and changing the hydraulic retention time (HRT) from 50 to 15 days until first acidification condition (on pH = 6.5), with biochar at an optimal concentration of 30 g/L in HRT= 20–10 day. Also, countermeasures for the acidified reactor with biochar during the dormancy period were investigated. The results demonstrated that adding biochar led to a rapid recovery of the acidified reactor, improved stability parameters, and removed foaming as a disturbance. Biochar addition (30 g/L) enhanced the organic loading rate (OLR) up to 11 kgVS/m3.day with an HRT of 20 days leading to specific methane production of 383 L/kgVS and a volumetric production increase of biomethane by 85 %. However, at higher OLRs with HRT of 10 days, acidification condition resurfaced leading to homogeneous foaming. Excess adding of biochar did not have significant treatment effects but necessitated a no-feeding period (about 45 days) and gentle stirring with long intervals for stable conditions. Overall, the use of biochar along with the OFMSW biogas plant was demonstrated to enhance production efficiency.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100171"},"PeriodicalIF":0.0,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445373","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}

{"title":"Bridging the gap: Transforming waste management awareness into action","authors":"Emma Etim","doi":"10.1016/j.clwas.2024.100173","DOIUrl":"10.1016/j.clwas.2024.100173","url":null,"abstract":"<div><div>This cross-sectional study investigated the awareness and attitudes towards municipal solid waste management (MSWM) among 400 households across three states in Southwestern Nigeria. Using binary logistic regression and the theory of planned behaviour, the research revealed a significant gap between self-reported awareness and the actual implementation of effective MSWM practices. Only 35 % of respondents adhered to the top tier approaches of the waste management hierarchy (avoidance, reduction, and reuse). Awareness of specific MSWM policies was the strongest predictor of positive attitudes, making individuals six times more likely to engage in supportive behaviours. Gender differences were notable, with males demonstrating higher awareness and more positive attitudes than females. The study emphasizes the need for targeted educational campaigns to bridge the gap between general awareness and effective practices. The willingness to pay for MSWM services was high across different income segments, reflecting huge opportunities for public-private partnership and entrepreneurship. This study concluded that in order to transform waste management awareness into action, pertinent issues such as comprehensive education, robust policies, strategic investments and payment for waste management services must be taken into account.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100173"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423589","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}

{"title":"Influence of enzymatic hydrolysis conditions on antimicrobial activities and peptide profiles of milk protein-derived hydrolysates from white wastewater","authors":"Diala Damen ,&nbsp;Jacinthe Thibodeau ,&nbsp;Sami Gaaloul ,&nbsp;Ismail Fliss ,&nbsp;Steve Labrie ,&nbsp;Safia Hamoudi ,&nbsp;Laurent Bazinet","doi":"10.1016/j.clwas.2024.100172","DOIUrl":"10.1016/j.clwas.2024.100172","url":null,"abstract":"<div><div>The focus of our investigation lies in the hydrolysis of milk proteins found in the substantial wastewater generated by the dairy industry, particularly in the white and cleaning wastewater resulting from rinsing and cleaning-in-place processes in order to enhance the value of dairy constituents by producing a diverse population of peptides, including potential antimicrobial peptides generated by 4 different enzymes: pepsin, trypsin, pronase E, and thermolysin. The protein/peptide content was influenced by the degree of hydrolysis values ranging from 2 % to 13 %, and UPLC-MS/MS characterization reveals distinct peptide sequences in enzymatic hydrolysates. The impact of hydrolysis time was also examined, revealing significant differences between 30 minutes and 240 minutes, with 555 peptides identified at 30 minutes, increasing to 693 at 240 minutes. After 4 hours, grouping showed variations: 181 peptides (thermolysin), 153 (pepsin), 126 (trypsin), and 83 (pronase E). A comparative analysis of the characterized sequences with antimicrobial peptides databases identified 17 antimicrobial peptides after 240 minutes pronase E and thermolysin hydrolysis, though they were insufficient to inhibit strains like <em>Clostridium tyrobutyricum</em> and <em>Pseudomonas aeruginosa</em>. Antimicrobial assays also revealed that peptides from Pronase T30, Pronase T240, and Thermolysine T240 exhibited antifungal activity against <em>Mucor racemosus</em> (MIC 2.5 mg/mL), but none against <em>Penicillium commune</em>. The effet of enzymatic hydrolysis demonstrated in this study highlights, for the first time, the potential for valorizing dairy white wastewater within the context of a circular economy framework.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100172"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441129","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}

{"title":"Development and assessment of eco- and user-friendly geopolymeric stabilizers for sustainable soil improvement","authors":"Mukhtar Hamid Abed ,&nbsp;Israa Sabbar Abbas","doi":"10.1016/j.clwas.2024.100170","DOIUrl":"10.1016/j.clwas.2024.100170","url":null,"abstract":"<div><div>This paper presents an innovative approach to address inherent limitations in traditional geopolymerization methods by focusing on producing eco and user-friendly mechano-chemically activated geopolymeric (M-GP) stabilizers for soil stabilization applications. A comparative analysis is conducted to benchmark the effectiveness of these stabilizers against conventionally activated geopolymer (C-GP) stabilizers. The study also investigates the influence of ground granulated blast furnace slag (GGBFS) amount on the mechanical and durability characteristics of stabilized soil specimens. Furthermore, the effect of activation techniques on the efficacy and strength of soil after sulfuric acid (H₂SO₄) exposure was investigated. The durability performance was evaluated by submerging the samples in a 1 % H₂SO₄ solution for a period of 60 and 120 days. The evaluation addresses various aspects such as visual appearance, mass changes, unconfined compressive strength (UCS), ultrasonic pulse velocity (UPV) and the Fourier transform infrared spectroscopy (FTIR) of geopolymer-stabilized soil samples. Results indicate that the UCS of M-GP samples surpassed C-GP-stabilized soil by 12–45 %. Moreover, the geopolymer-stabilized soil exhibited a significant increase in strength, with improvements of 114 %, 247 %, and 361 % observed at GGBFS content levels of 50 %, 75 %, and 100 % by weight, respectively. After exposure to the H₂SO₄ solution, M-GP-stabilized soil demonstrated superior resistance to sulfuric acid compared to C-GP-stabilized soil. The residual ultimate compressive strength (UCS) for M-GP and C-GP specimens was 80 % and 76 % respectively after being subjected to the H₂SO₄ solution for 60 days. However, these values further declined to 53 % and 48 % after 120 days of exposure. In addition, the result showed that geopolymer-stabilized soil containing 75 % slag exhibited superior resistance to H₂SO₄ compared to other stabilized soil samples.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100170"},"PeriodicalIF":0.0,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423588","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}

{"title":"The limitations of an informational campaign to reduce household food waste at the community scale","authors":"Maggie Bain ,&nbsp;Das Soligo ,&nbsp;Paul van der Werf ,&nbsp;Kate Parizeau","doi":"10.1016/j.clwas.2024.100167","DOIUrl":"10.1016/j.clwas.2024.100167","url":null,"abstract":"<div><p>In this study, we designed and tested a household food waste intervention in the County of Wellington, Canada. This small study compared control households (n = 20) to those receiving an intervention package (n = 32). Food waste generation rates and composition were observed through waste composition audits before and after the intervention, and participants’ feedback on the intervention was received through a survey (n = 7). We found that although the informational campaign was generally not successful in reducing food waste generation at the community scale (possibly due to intention-behavior gaps), there is potential for such interventions to encourage a sub-set of individuals toward reduction behaviors when appropriately targeted and delivered.</p></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100167"},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277291252400040X/pdfft?md5=c6768f949e6e93ad2055f59f2eb04745&pid=1-s2.0-S277291252400040X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274878","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}

{"title":"Influence of moral reasoning and environmental concern on sustainable food consumption behaviors: A gender comparison among university students","authors":"Gustavo Barrera-Verdugo ,&nbsp;Daniel Durán-Sandoval","doi":"10.1016/j.clwas.2024.100164","DOIUrl":"10.1016/j.clwas.2024.100164","url":null,"abstract":"<div><p>Currently, South American countries face social and environmental challenges that can be addressed through the transformation of food purchasing and preparation patterns. This study aims to enhance comprehension regarding personal factors influencing sustainable food consumption, by examining the impact of moral reasoning and environmental concern on this behavior. The responses of 233 Chilean university students to an online self-report survey were analyzed using Partial Least Squares Structural Equation Modeling. The results have shown that moral reasoning and environmental concern positively impact sustainable food consumption behaviors, such as opting for food with minimal packaging, conserving energy during cooking, and repurposing food waste. Additionally, significant gender differences in these effects were observed. These novel findings provide further evidence supporting the necessity of bolstering moral education and environmental consciousness to foster the adoption of sustainable food consumption practices among university students in developing South American nations. Furthermore, the results underscore the importance of considering gender distinctions in education, particularly in light of entrenched family and societal roles.</p></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100164"},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772912524000368/pdfft?md5=bdbadfa4aecf1f33c1fb10bee66210b2&pid=1-s2.0-S2772912524000368-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274877","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}

{"title":"Indigenous traditional knowledge for cleaner waste systems and sustainable waste management system in Ghana","authors":"Kwame Anokye,&nbsp;Asaah Sumaila Mohammed","doi":"10.1016/j.clwas.2024.100165","DOIUrl":"10.1016/j.clwas.2024.100165","url":null,"abstract":"<div><p>Ghana has been experiencing a lot of challenges in waste management mainly due to the effects from the growth of its population and their incrementing demand for urban infrastructure. This paper examines the effectiveness of incorporating Indigenous Traditional Knowledge (ITK) for the improvement of waste management in Ghana. With the given situation of current waste management problems like low rates of proper utilization of waste bins and uncollected waste burning, this review has come up with serious concerns. Using a narrative approach to conducting this research, the review of literature was sourced from academic databases to assess the ITK contribution to cleaner waste systems. Key facts identified concurred with previous empirical evidence indicating the sustainability of traditional approaches regarding waste management and community participation. Recommendations call for the incorporation of ITK into national policies by highlighting key features of community participation and government support. Therefore, despite various limitations such as relatively scarce empirical evidence and differences in regional practices, integrating ITK opens up new opportunities for the long-term, environmentally friendly waste management in Ghana as part of the global environmental protection effort.</p></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100165"},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277291252400037X/pdfft?md5=823719c9985d1ecd85efb989f25a3d26&pid=1-s2.0-S277291252400037X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142163279","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}

{"title":"Urban mining of e-waste management globally: Literature review","authors":"Omar Ouro-Salim","doi":"10.1016/j.clwas.2024.100162","DOIUrl":"10.1016/j.clwas.2024.100162","url":null,"abstract":"<div><p>The global generation of electronic waste (e-waste) has been increasing alarmingly, posing significant environmental and health risks. Urban mining, which involves extracting valuable resources from e-waste, has emerged as a promising solution to address these challenges and promote sustainable resource management. This study explores urban mining as a transformative practice for e-waste management, examining its alignment with sustainable development goals (SDGs) and identifying the associated challenges and opportunities. It underscores the critical importance of comprehensive regulations in effectively managing e-waste. The study aims to achieve the following specific objectives: 1) Scrutinize the state of the art of e-waste and urban mining practices, as documented in the literature; 2) Assess the relation between urban mining and circular economy; 3) Explore what kind of wastes are more explored in urban mining; 4) Examine the different case studies on urban mining; 5) Analyze data from collected documents and 6) propose a research agenda. The review synthesized 124 studies to gain insights into the effectiveness of urban mining and its potential contribution to sustainability. The findings reveal that urban mining is more frequently emphasized in the e-waste sector than in the construction sector, representing this study's essential contribution. Furthermore, the study highlights the technologies and research areas currently capturing the attention of researchers, as well as the gaps that need to be addressed in future studies. However, challenges remain, including adequate regulations, extended producer responsibility, and the inclusive participation of consumers and informal workers in urban mining. While urban mining holds significant potential to revolutionize e-waste management and contribute to sustainable resource management, realizing this potential will require robust regulatory support.</p></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100162"},"PeriodicalIF":0.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772912524000344/pdfft?md5=020727ff86803dbc8e27254ac7377fc8&pid=1-s2.0-S2772912524000344-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158009","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}