Cleaner Waste Systems最新文献_第6页

Study on polymer-containing oily sludge as a potential fuel by combustion thermochemistry 含聚合物含油污泥作为潜在燃料的燃烧热化学研究

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100182

Yuhao Cao , Mulin Zou , Aohan Ran , Peiying Zong , Zhaowei He , Xiang Gou

The environmental and resource issues posed by oil sludge have sparked a renewed interest in cleaner and more efficient oil production. The investigation on the combustion process of polymer-containing oily sludge (POS) is expected to open up new markets for POS as an alternative fuel. TGA was used to examine the combustion behaviour, kinetics, and thermodynamics of POS, and X-ray fluorescence (XRF) was used to measure the chemical composition of POS ash to predict ash fouling and slagging. Based on the TG-DTG curves, the mass loss of POS in combustion studies was split into four major areas. The combined calculation method of model-free methods, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS), was applied to determine the activation energies from stage 1 to stage 4, which were 47.89 kJ/mol, 66.09 kJ/mol, 190.55 kJ/mol, and 98.37 kJ/mol, respectively. A four-stage kinetic model (D4→D2→D3→R2) was established to describe the combustion process of POS. Compared to other conventional sludges, POS has a relatively low activation energy and is more susceptible to thermochemical transformations. The difference between the enthalpy change (Δ

H

) and activation energy (

E

) indicated that the reactions benefit the formation of the activated complex. Meanwhile, the change in entropy (Δ

S

) implied the thermodynamic disequilibrium in the 3rd stage of POS and completion of the thermal conversion at the end of the reaction. The change in Gibbs free energy (ΔG) increased in a stepwise manner and its lower average value reflected the greater reaction favourability of combustion for POS. The composition of POS ash was mainly metal oxides, with the slagging index, fouling index, and slagging viscosity index of 1.0, 9.1, and 32.0, respectively. POS ash has high fouling and slagging, with special attention in the combustion application.

油泥所带来的环境和资源问题引发了人们对更清洁、更高效的石油生产的新兴趣。含聚合物含油污泥燃烧过程的研究有望为含油污泥作为替代燃料开辟新的市场。利用热重分析（TGA）研究了POS的燃烧行为、动力学和热力学，并利用x射线荧光（XRF）测量了POS灰的化学成分，以预测灰结垢和结渣。根据TG-DTG曲线，将燃烧研究中POS的质量损失分为四个主要区域。采用无模型法的Flynn-Wall-Ozawa （FWO）和Kissinger-Akahira-Sunose （KAS）联合计算方法确定了第1 ~ 4阶段的活化能，分别为47.89 kJ/mol、66.09 kJ/mol、190.55 kJ/mol和98.37 kJ/mol。建立了四阶段动力学模型（D4→D2→D3→R2）来描述POS的燃烧过程。与其他常规污泥相比，POS的活化能相对较低，更容易发生热化学转化。焓变（ΔH）和活化能(E)的差值表明反应有利于活性配合物的形成。同时，熵的变化（ΔS）表明在POS的第三阶段热力学不平衡，在反应结束时完成了热转化。Gibbs自由能（ΔG）的变化呈逐步增大的趋势，其平均值越低，表明POS的燃烧反应越有利。POS灰分的组成以金属氧化物为主，结渣指数为1.0，结垢指数为9.1，结渣粘度指数为32.0。POS灰具有高结垢和结渣的特点，在燃烧应用中应特别注意。

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引用次数: 0

The future of waste management in Ghana: Assessing the feasibility and scalability of smart waste solutions amidst key adoption challenges 加纳废物管理的未来：在关键采用挑战中评估智能废物解决方案的可行性和可扩展性

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100183

Kwame Anokye , Ohene Boansi Apea , Abigail Okyere Darko , Luther Adjei Kwabi

This study explores the potential of smart waste management systems to transform waste disposal practices in Ghana, a nation grappling with significant waste management challenges. The research reveals a stark contrast between the limited infrastructure and traditional waste disposal methods prevalent in rural areas and the more developed, yet still imperfect, systems in urban centers. The study highlights the feasibility of integrating smart technologies—such as sensor-equipped bins, GPS tracking, and data analytics—into Ghana’s waste management landscape, despite the considerable economic, infrastructural, and social barriers. A key finding is the need for foundational improvements in waste infrastructure before advanced smart systems can be effectively introduced, particularly in rural areas. The study also throws more light on the importance of public-private partnerships and targeted public education campaigns to overcome these barriers and foster broader adoption of smart technologies. Along offering practical recommendations and drawing comparisons with similar efforts in other low-income countries, this research provides valuable insights for policymakers and stakeholders aiming to enhance waste management practices in Ghana. This study is novel in its focus on applying smart waste management solutions in the context of a developing country like Ghana. While much existing research centers on developed nations, this study uniquely addresses the intersection of socio-economic and technological factors specific to Ghana, offering a well-designed practicable and actionable approach to implementing advanced waste management technologies in a challenging environment.

本研究探讨了智能废物管理系统在加纳改变废物处理实践的潜力，加纳正在努力应对重大的废物管理挑战。这项研究揭示了农村地区普遍存在的有限的基础设施和传统的废物处理方法与城市中心更发达但仍不完善的系统之间的鲜明对比。该研究强调了将智能技术（如配备传感器的垃圾箱、GPS跟踪和数据分析）整合到加纳废物管理领域的可行性，尽管存在相当大的经济、基础设施和社会障碍。一个重要的发现是，在有效引入先进的智能系统之前，特别是在农村地区，需要从根本上改善废物基础设施。该研究还进一步阐明了公私伙伴关系和有针对性的公共教育活动的重要性，以克服这些障碍，促进更广泛地采用智能技术。除了提出切实可行的建议并与其他低收入国家的类似努力进行比较外，本研究还为旨在加强加纳废物管理实践的政策制定者和利益相关者提供了宝贵的见解。这项研究的新颖之处在于，它侧重于在加纳这样的发展中国家应用智能废物管理解决方案。虽然现有的许多研究都集中在发达国家，但本研究独特地解决了加纳特有的社会经济和技术因素的交叉点，为在充满挑战的环境中实施先进的废物管理技术提供了一个精心设计的可行和可操作的方法。

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引用次数: 0

Development and field test of Red mud-Fly Ash Geopolymer pile (RFP)

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100184

Nie Qingke , Zhang Haiqing , Yang Haipeng , Jia Xiangxin , Zhang Rihua

Red mud is an industrial solid waste obtained from the extraction of alumina from bauxite. In order to study the resource utilization of red mud and improve its comprehensive utilization rate, based on the principle of geological polymers, red mud based geological polymers are prepared using raw materials such as red mud, fly ash, blast furnace slag powder, sand, stone, and alkaline solution as pile materials. Through lab experiments, the ratio of red mud and fly ash geopolymer mixtures that can be used for underwater injection and pumping has been obtained; Through on-site experiments, the complete construction process and the bearing characteristics of red mud-fly ash geopolymer piles (RFP) was studied. Environmental impact assessments were conducted by monitoring the changes in water quality around the RFP. The research results laid the foundation for the engineering application of RFP piles. It was found that: (1) At a liquid-solid ratio of 0.55, the geopolymer mixture of red mud: fly ash: sand: crushed stone: GGBS=(1:2:2:4.94:0.1) has good workability. The geopolymer with this mix ratio can meet the performance requirements of pumping and underwater perfusion, the slump can be controlled between 220 and 225 mm, and the strength after 28 days of room temperature curing is 13.9 MPa. (2) Developed a complete set of construction techniques for RFP, including drying, grinding and sieving of red mud, preparation of alkaline activator solution, sequence of material mixing, and related processes for pile drilling, placement of conduits, and conduit method grouting. (3) The load test results show that in a silty clay foundation, the ultimate vertical compressive bearing capacity of a single RFP with a pile length of 10.0 m and a pile diameter of 520 mm is 753 kN. When the pile spacing is 1.5 m, the bearing capacity of single-pile composite foundation is 240kPa. The Q-S curve and the stress distribution curve of the pile indicate that its load transfer characteristics are consistent with those of ordinary concrete piles. The results of the core sampling test on the pile body show that the core sample taken from the 10 m pile is relatively complete, the rate of core recovery reaches over 99 %,it shows that the pile body is intact. The compressive strength experiment shows that the strength of core samples at different depths is above 10 MPa,and up to 19.5 MPa. (4) The continuous water quality monitoring results for 5 months indicate that the implementation of RFP has not cause significant adverse effects on the quality of surrounding water bodies.

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引用次数: 0

Public perceptions of waste-to-energy technology in developing countries: A case study of tamale, Ghana

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100192

Abdul-Wahab Tahiru , Samuel Jerry Cobbina , Wilhemina Asare

While Waste-to-Energy (WtE) holds promise for addressing waste management challenges in Ghana, its social acceptance remains a hurdle. To understand the public's perspective, this research employed a questionnaire survey. With a remarkable response rate of 85.9 %, 460 questionnaires were distributed and 395 were returned, providing a robust dataset for analysis. This high participation level demonstrates the public's interest in the issue, setting the stage for a deeper exploration of their perceptions and concerns regarding WtE technology. The results show heightened environmental awareness and resource shortage concerns among residents. While acknowledging WtE benefits, a lack of technical understanding fuels anxieties about odor and health risks, manifesting as a "Not-In-My-Backyard" (NIMBY) syndrome. Age, education, and proximity to WtE plants influence awareness and acceptance, with higher levels observed in urban residents, older age groups, and those closer to existing WtE plants. While perceived environmental awareness and recognition of WtE doesn't directly impact attitudes, perceived risks and benefits, especially risks, significantly influence public attitude and acceptance of WtE. To promote WtE development, targeted education campaigns, standardized waste management, and robust environmental regulations are crucial. This study offers insights for navigating the complex interplay of awareness, risk perception, and acceptance for sustainable WtE implementation in Ghana.

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引用次数: 0

Investigating behavior, attitude and intention towards waste segregation in tier II cities of India using theory of planned behavior

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100188

Maheshchandra Babu Jampala , Tina Shivnani

India's rapid urbanisation and waste rise make sustainable waste management challenging. Present study utilizes theory of planned behavior (TPB) to identify issues related to behavioral adaptations in waste segregation among the households’ procedures in Jaipur and Indore cities of India. 448 respondents from each city were selected using convenience sampling. A self-designed questionnaire containing 30 items corresponding to attitude (AT), Perceived Behaviour Control (PBC), Subjective norms (SN) and Intention (IN) was used. The demographic profile of the respondents was also collected, and its analysis revealed nearly uniform distribution of the sample population. No significant effect of any of the demographic parameter was noted on either of the attributes. Respondent’s city showed significant influence on all the 4 attributes due to drastic variations recorded in the responses for each determinant. SN had the biggest impact on IN, although all three hypotheses were validated and showed significantly beneficial impacts. The proposed model was a very good fit. Further, comparison of model for both cities revealed that only 2 attributes i.e. AT & SN in case of Jaipur and AT & PBC in case of Indore had significant positive effect on waste sorting intentions. The findings of this study provide a comprehensive comparison between two distinct cities, emphasizing how various behavioral factors contribute to changes in intention within diverse contexts. The key concerns that are highlighted based on the responses of residents from different cities could be used to prepare a roadmap for improving sensitivity towards waste segregation among Indian population.

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引用次数: 0

Corrigendum regarding previously published articles

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100166

引用次数: 0

Mitigating landfill emissions strategies for effective waste management in tabuk 减低堆填区排放的策略，以达致有效的废物管理

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100187

Abderrahim Lakhouit

This study investigates the environmental impacts associated with solid waste management in the Tabuk region of Saudi Arabia, specifically focusing on the implications of landfill emissions. With the population of Tabuk projected to increase from 887,536 in 2023–928,036 by 2050, the quantity of waste generated is expected to rise significantly, reaching an estimated 575,846,338 kg annually. This research highlights the critical relationship between increasing waste generation, greenhouse gas emissions, and environmental degradation, emphasizing the production of methane and carbon dioxide—potent contributors to global warming and air pollution. Utilizing the LandGEM model, emissions associated with rising waste volumes are quantified, revealing alarming trends in soil and groundwater contamination that adversely affect local ecosystems and biodiversity. Furthermore, the analysis indicates that the potential for biogas production from waste could yield substantial energy output, with projections showing an increase in biogas collection from 99,741 m³ in 2024 to approximately 1,514,931 m³ by 2050, translating into over 15 million kWh of renewable energy. The findings underscore the urgent need for effective waste management strategies in Tabuk, advocating for enhanced waste segregation and investment in waste-to-energy technologies as viable solutions. Ultimately, this research lays the groundwork for developing sustainable waste disposal practices that align with Saudi Arabia’s Vision 2030, fostering environmental sustainability and public health in the region.

本研究调查了沙特阿拉伯Tabuk地区与固体废物管理相关的环境影响，特别关注垃圾填埋场排放的影响。Tabuk的人口预计将从2023年的887,536人增加到2050年的928,036人，预计产生的废物量将大幅增加，预计每年将达到575,846,338 公斤。这项研究强调了不断增加的废物产生、温室气体排放和环境退化之间的关键关系，强调了甲烷和二氧化碳的产生，这是导致全球变暖和空气污染的有力因素。利用LandGEM模型，量化了与废物量增加相关的排放，揭示了土壤和地下水污染的惊人趋势，这些趋势对当地生态系统和生物多样性产生了不利影响。此外，分析表明，利用废物生产沼气的潜力可以产生大量的能源产出，预测显示沼气收集量将从2024年的99,741 m³增加到2050年的约1,514,931 m³，转化为超过1500万千瓦时的可再生能源。调查结果强调了Tabuk迫切需要有效的废物管理战略，提倡加强废物分类和投资废物转化为能源的技术，作为可行的解决办法。最终，这项研究为制定符合沙特阿拉伯《2030年愿景》的可持续废物处理做法奠定了基础，促进了该地区的环境可持续性和公共卫生。

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引用次数: 0

Predicting waste management behaviors using an extended theory of reasoned action model

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100193

Alvin Patrick M. Valentin, Phoemela Bianca S.D. Bonifacio, Sofia Isabel Corinne O. Castro, Jerica Charity A. Ruiz, Talisha Isabella L. Sy, Elmer Lewis O. Trinidad

Rapid urbanization has resulted in a significant increase in the amount of waste generated, which threatens the health and safety of millions of people worldwide. For our cities to become environmentally sustainable, proper waste management has become essential. A major source of pollution resulting from improper waste management are developing countries, such as the Philippines which is a top contributor to plastic wastes in oceans. Existing studies in this context focus on the effectiveness of specific waste management programs, and there is an opportunity to extend theories to improve our understanding of the waste management behaviors of households. Using an extended theory of reasoned action model that includes attitudes toward urban environmental sustainability, knowledge of urban environmental sustainability, and knowledge of waste management, this study predicted people’s waste management behaviors and their behavioral change factors in the study area. Results of regression analyses showed that attitudes and knowledge toward urban environmental sustainability predicted attitudes toward waste management. Results also showed that knowledge of urban environmental sustainability predicted knowledge of waste management. Moreover, attitudes toward waste management, subjective norms, and knowledge of waste management predicted intentions toward waste management. Finally, intentions toward waste management predicted waste management behavior. These findings empirically support the extended model, showing that the inclusion of urban environmental sustainability and knowledge-related factors can improve the prediction of waste management behaviors using the theory of reasoned action. These findings inform policymakers in crafting policies that will promote waste management behaviors to combat the negative consequences of urbanization.

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引用次数: 0

Synthesis and characterization of nano-Plaster of Paris from Babylonia japonica, Oliva sayana, and Conasprella bermudensis 以紫菜、野橄榄和红豆为原料制备纳米巴黎石膏及其表征

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100189

Md. Kawsar , Md. Sahadat Hossain , Sumaiya Akter , Newaz Mohammed Bahadur , Samina Ahmed

In this study, Plaster of Paris (POP, CaSO₄.0.5H₂O) was successfully synthesized from the shells of marine mollusks, specifically Conasprella bermudensis, Babylonia japonica, and Oliva sayana, highlighting the potential of utilizing marine resources for material production. The synthesis process was accelerated through a chemical reaction between the mollusk shells and sulfuric acid, which provided calcium and sulfate ions, respectively. Various model equations were employed to assess the crystallite size, which was less than 200 nm; notably, all models except the Halder-Wagner technique yielded significant estimations for the synthesized products. The calculated energy density ranged from 1.32×10² to 2.38×10³ J/m³, with stress values between 5.02×10⁵ and 2×10⁶ and strain values from 5×10⁻⁴ to 1.7×10⁻³. The preferred growth calculation indicated that the (200), (400), and (020) planes are the most thermodynamically stable for the synthesized POP. Additionally, FTIR analysis confirmed the presence of sulfate and hydroxyl functional groups in the products. This research advances the understanding of nano-Plaster of Paris (POP) derived from marine sources, promotes sustainable practices in material synthesis, and explores new applications in construction and biomedical fields.

本研究成功地利用海洋软体动物Conasprella berberensis、Babylonia japonica和Oliva sayana的贝壳合成了Plaster of Paris (POP, CaSO4.0.5H2O)，突出了利用海洋资源生产材料的潜力。通过软体动物壳与硫酸的化学反应加速了合成过程，硫酸分别提供钙离子和硫酸盐离子。采用多种模型方程对微晶尺寸进行了评估，微晶尺寸小于200 nm；值得注意的是，除了Halder-Wagner技术外，所有模型都对合成产物产生了显著的估计。计算出的能量密度范围从1.32×10²到2.38×10³J/m³，应力值在5.02×10和2×10⁶之间，应变值在5×10⁻到1.7×10⁻。优选生长计算表明（200）、（400）和（020）平面是合成的POP最稳定的热力学面。此外，FTIR分析证实产物中存在硫酸盐和羟基官能团。这项研究促进了对海洋来源的纳米巴黎石膏（POP）的理解，促进了材料合成的可持续实践，并探索了在建筑和生物医学领域的新应用。

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引用次数: 0

Improving household waste management in Indonesia: A mixed-methods approach for waste Sorting

Cleaner Waste Systems

Pub Date : 2024-12-01 DOI: 10.1016/j.clwas.2024.100185

Emenda Sembiring , Rakotoarisoa Maminirina Fenitra , Aisya Rahmania Dangkua , Zayinatun Biladiyah Al Khoeriyah , Anouk Zeeuw Van Der Laan , Yueyun Fan , Fabrizio Ceschin , Susan Jobling

This study explores effective interventions that improve household waste sorting and tests how labels, captions, and intervention campaigns enhance waste-sorting knowledge and improve waste-sorting practices. This study used a mixed–method approach using data collected from 29 households. The results from the survey were tested using a t-test comparison, the data obtained from the observation during the lab experiment were described, and the information from the interview was interpreted. The results show that the two interventions used in the study improved knowledge about waste and sorting practices. The results show significant differences between the groups before and after intervention exposure. Moreover, the findings highlighted that labels and captions do not help to reduce household waste generation. However, an intervention campaign was crucial in reducing the amount of waste produced by households.

引用次数: 0