Cleaner Waste Systems最新文献

{"title":"Transforming waste into strength: Evaluating properties of concrete with waste glass substitution","authors":"Kushal Rana Bhat ,&nbsp;Ghanshyam Dumre ,&nbsp;Tek Raj Gyawali","doi":"10.1016/j.clwas.2024.100179","DOIUrl":"10.1016/j.clwas.2024.100179","url":null,"abstract":"<div><div>Waste glass (WG) poses a significant environmental challenge due to its non-biodegradability and prevalence in landfills. This paper investigates the effects of using WG as a replacement for coarse aggregate (CA), fine aggregate (FA), and cement in concrete, utilizing WG coarse aggregate (WGCA), WG fine aggregate (WGFA), and WG powder (WGP), respectively. WG was mechanically crushed and sieved to obtain WGCA, WGFA, and WGP. The use of whole crushed waste glass (WG) particles, without any residue, introduces a novel aspect to this work. The study examined these replacements in a control concrete mix with a water-cement ratio of 0.38 and a mix proportion of cement, FA, and CA of 1:1.717:2.560 by weight. Replacement levels were set at 0 %, 5 %, 10 %, 15 %, 20 %, and 25 % by weight of the respective ingredient. Results showed that incorporating WG improved the slump value of the concrete while slightly decreasing its density. The optimum replacement levels were identified as 15 % for both WGCA and WGFA, and 10 % for WGP, which enhanced the 28-day compressive strength by 22.1 %, 20.1 %, and 13.1 %, respectively. At 20 % replacement for CA and FA, and 15 % for C, the compressive strength was comparable to that of the control concrete. The elastic modulus followed a similar trend to the compressive strength. However, at these optimum WG replacement levels, flexural strength decreased to 6.04 MPa, 5.89 MPa, and 6.14 MPa, respectively, from 6.32 MPa in the control concrete. Splitting tensile strength decreased to 2.97 MPa, 3.07 MPa, and 3.23 MPa, respectively, from 3.35 MPa. Water absorption also reduced to 3.83 %, 4.23 %, and 4.41 %, respectively, from 4.61 %. Empirical models were developed and compared with those from previous studies. Further research to strengthen the interfacial transition zone and ascertain detailed durability properties is necessary before implementing this sustainable concrete in real-world applications. The implementation of the results from this research may not only minimize glass waste but also contribute to the production of sustainable concrete, reducing CO₂ emissions and mitigating environmental degradation by lowering the consumption of cement and aggregates. Furthermore, this work plays a significant role in global efforts to reduce solid waste and combat environmental pollution.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100179"},"PeriodicalIF":0.0,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538064","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":"Stripping down sustainability assessments for easier comparison of innovative recycling options","authors":"Erik Dekker ,&nbsp;Joris T.K. Quik ,&nbsp;Michelle A. Steenmeijer ,&nbsp;Johannes P.A. Lijzen","doi":"10.1016/j.clwas.2024.100178","DOIUrl":"10.1016/j.clwas.2024.100178","url":null,"abstract":"<div><div>In this short communication we propose a screening approach for assessing the sustainability of new recycling options. Before performing a full comparative LCA it is useful to perform a simplified LCA because of the lower data intensity. The impact categories are limited to greenhouse gas emissions and land use. As an example car tire recycling is shown. This screening approach is already useful for decision makers and can be used by stakeholders to compare innovative with the baseline technology.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100178"},"PeriodicalIF":0.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537062","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":"Quantification and characterization of municipal solid waste at aler dumpsite, Lira City, Uganda: Assessing pollution levels and health risks","authors":"Ogwang Nickson ,&nbsp;Zubeda Ukundimana ,&nbsp;Fwangmun B. Wamyil ,&nbsp;Abdulfatah Abdu Yusuf ,&nbsp;Mutuyimana Jean Pierre ,&nbsp;Abdou Safari Kagabo ,&nbsp;Theogene Rizinde","doi":"10.1016/j.clwas.2024.100177","DOIUrl":"10.1016/j.clwas.2024.100177","url":null,"abstract":"<div><div>Managing municipal solid waste (MSW) in urban areas of developing countries is a significant challenge due to rapid urbanization and inadequate infrastructure. This study aims to quantify the MSW at Aler dumpsite in Lira City, Uganda, and assess the associated environmental and health risks. Our findings revealed a daily dumping rate of 7.38 tons, predominantly organic waste. Leachate from the site exceeded WHO limits for nutrients and heavy metals, with exceptionally high amounts of cadmium (Cd) found in soil (4.8 mg/kg) and vegetables. The water quality in nearby streams was poor, rendering it unfit for consumption due to elevated ion and nutrient levels. Health risk assessments indicated significant non-carcinogenic risks from heavy metal ingestion, with a hazard index (HI) of 4.6 for adults and 9.6 for children. While dermal exposure risks were generally low, children were at risk from stream 1 (HQderm = 1.165). Vegetable analysis revealed levels of lead (Pb), cadmium (Cd), zinc (Zn), and nickel (Ni) above safe doses, posing significant non-carcinogenic risks. To address these issues, we recommend increasing public awareness to avoid consuming water and vegetables from areas around the dump site. Additionally, we suggest that the responsible authorities improve MSW management by constructing sanitary landfills to minimize water, soil, and plant pollution from landfill leachate.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100177"},"PeriodicalIF":0.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532601","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":"Enhancing performance of construction waste management: Factor analysis from the building contractors’ perspectives","authors":"Vuthea Min ,&nbsp;Kriengsak Panuwatwanich ,&nbsp;Koji Matsumoto","doi":"10.1016/j.clwas.2024.100176","DOIUrl":"10.1016/j.clwas.2024.100176","url":null,"abstract":"<div><div>With the rapid growth of urbanization, construction projects have surged, increasing construction waste (CW). Effective construction waste management (CWM) is crucial to mitigate the adverse effects of CW on the environment, society, and the economy. This study aimed to identify critical attributes and factors that enhance CWM in building construction. Attributes were initially identified through a literature review and verified by 32 experts. Subsequently, a questionnaire based on the retained attributes was developed, and a survey was conducted with 304 construction professionals from the building construction sector in Cambodia and Thailand. Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) were sequentially conducted and further revealed five factors with a total of 27 attributes, namely Governance and policies (8 attributes), Materials and equipment (8 attributes), Requirements and specifications (4 attributes), Construction information systems (4 attributes), and Waste collection facilities (3 attributes). This study identified and confirmed the critical attributes and factors in enhancing the contractors’ CWM performance in building construction that are specifically within the 2 R strategy (reduce and reuse) that contractors can fully control on their construction sites. The findings provide empirical evidence to guide contractors in improving CWM in building construction projects. By enhancing all attributes across the five key factors, contractors can minimize CW and reduce the negative impact of construction activities on the environment and society, thereby contributing to sustainable construction practices.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"9 ","pages":"Article 100176"},"PeriodicalIF":0.0,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537938","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":"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}