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Efficient ibuprofen removal using enzymatic activated ZIF-8-PVDF membranes 利用酶活化 ZIF-8-PVDF 膜高效去除布洛芬
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-22 DOI: 10.1016/j.clet.2024.100824
Ayat Hassan , Shadi W. Hasan , Bart Van der Bruggen , Sulaiman Al-Zuhair
This study investigated the development of poly(vinylidene fluoride) (PVDF) hybrid ultrafiltration membranes, where ZIF-8 nanocrystals are synthesized in situ within the membrane pores. These ZIF-8 embedded membranes are specifically designed for the treatment of emerging pollutants, such as ibuprofen. The optimized membrane, characterized by a higher concentration of ZIF-8 and greater surface coverage, exhibited significantly enhanced performance and improved properties, including increased hydrophobicity and mechanical strength. By increasing the zinc concentration from 0.2 to 0.3 M during the preparation of the ZIF-8 coated membrane, hydrophobicity was enhanced, as indicated by an increase in the contact angle from 60.3° to 87.2°, along with improved porosity from 41.3% to 60.5%. Further performance enhancements were achieved by encapsulating enzymes, specifically laccase and peroxidase, within the ZIF-8 coated membrane. A comparison of ibuprofen removal by these enzymes showed that peroxidase was slightly more effective, reaching a maximum removal efficiency of approximately 45% within 2 h. The biocatalytic membranes demonstrated a high stability and reusability, underscoring their potential for efficient ibuprofen removal. These findings highlight the efficacy of ZIF-8-coated PVDF membranes as advanced tools for water purification, offering significant improvements in both purification efficiency and membrane stability.
本研究调查了聚偏二氟乙烯(PVDF)混合超滤膜的开发情况,在膜孔内原位合成了 ZIF-8 纳米晶体。这些 ZIF-8 嵌入膜专门用于处理布洛芬等新出现的污染物。优化后的膜具有更高的 ZIF-8 浓度和更大的表面覆盖率,性能显著提高,性能也得到改善,包括疏水性和机械强度增加。在制备 ZIF-8 涂层膜的过程中将锌浓度从 0.2 M 提高到 0.3 M,疏水性得到增强,这体现在接触角从 60.3°增加到 87.2°,孔隙率从 41.3% 提高到 60.5%。通过在 ZIF-8 涂层膜中封装酶,特别是漆酶和过氧化物酶,进一步提高了性能。对这些酶去除布洛芬的效果进行比较后发现,过氧化物酶的效果稍好,在 2 小时内达到约 45% 的最大去除效率。这些发现凸显了 ZIF-8 涂层 PVDF 膜作为水净化先进工具的功效,在净化效率和膜稳定性方面都有显著提高。
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引用次数: 0
The potential effects of window configuration and interior layout on natural ventilation buildings: A comprehensive review 窗户配置和室内布局对自然通风建筑的潜在影响:全面回顾
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-22 DOI: 10.1016/j.clet.2024.100830
Xin Yin , Mohammed W. Muhieldeen , Ruzaimah Razman , Jonathan Yong Chung Ee , Meng Choung Chiong
Natural ventilation is an eco-friendly and renewable energy source that enhances thermal comfort and energy efficiency. The window is the most traditional method of introducing natural ventilation into the built environment, but its full potential has been slow to be explored. The indoor arrangement of naturally ventilated buildings must be effectively managed to ensure indoor thermal comfort and ventilation efficiency. Although the windows offer a number of advantages for natural ventilation, they can be challenging to implement in real occupied conditions due to the integrated design between façade and interior arrangement. A comprehensive review aims to investigate the potential factors that influence the performance of natural window ventilation. The overall findings show that wind-driven cross-ventilation and single-sided ventilation are the most extensively studied natural window ventilation strategies. However, the topics of corner ventilation and buoyancy-driven ventilation do not receive much attention. The findings highlight that appropriate window designs, including factors such as window geometry, opening ratio, number of openings, location, type, orientation, and shading systems, can maintain thermal comfort, reduce cooling loads, extend ventilation period, and improve indoor air quality. In addition, it has been discovered that the geometric and thermal properties of indoor obstructions determine the advantages and limitations of local thermal comfort and airflow patterns in different scenarios. The necessity for further studies on the effects of interior conditions on natural window ventilation is argued, as it is a crucial issue for ensuring accurate results. The review of recent literature contributes to categorizing the influential factors and identifying the important aspects to be considered in natural window ventilation. Through this literature review, further research is encouraged to fully exploit the potential for integrating interior factors and window characteristics in the design of low-energy buildings.
自然通风是一种环保的可再生能源,可提高热舒适度和能源效率。窗户是将自然通风引入建筑环境的最传统方法,但其潜力却迟迟未得到充分挖掘。自然通风建筑的室内布置必须得到有效管理,以确保室内热舒适度和通风效率。虽然窗户为自然通风提供了许多优势,但由于外墙和室内布置之间的一体化设计,在实际占用条件下实施起来可能具有挑战性。一项综合研究旨在调查影响窗户自然通风性能的潜在因素。总体研究结果表明,风力驱动的交叉通风和单面通风是研究最为广泛的自然窗通风策略。然而,转角通风和浮力驱动通风的主题并没有得到太多关注。研究结果表明,适当的窗户设计,包括窗户的几何形状、开口率、开口数量、位置、类型、朝向和遮阳系统等因素,可以保持热舒适度、降低制冷负荷、延长通风时间并改善室内空气质量。此外,人们还发现,室内障碍物的几何和热特性决定了不同情况下局部热舒适度和气流模式的优势和局限性。因此,有必要进一步研究室内条件对窗户自然通风的影响,因为这是确保获得准确结果的关键问题。对近期文献的回顾有助于对影响因素进行分类,并确定自然窗通风需要考虑的重要方面。通过本次文献综述,鼓励进一步研究如何在低能耗建筑设计中充分利用室内因素和窗户特性的潜力。
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引用次数: 0
Transforming waste into valuable resources: Recycled nitrile-butadiene rubber scraps filled with electric arc furnace slag 变废为宝回收的丁腈橡胶废料填充电弧炉炉渣
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-18 DOI: 10.1016/j.clet.2024.100823
Anna Gobetti , Giovanna Cornacchia , Giorgio Ramorino
This study investigates the valorization of two industrial waste streams - nitrile butadiene rubber (NBR) scraps and electric arc furnace (EAF) slag – in the development of recycled NBR compounds filled with EAF slag as filler. A new recycling method for NBR scraps is employed via calendering at room temperature without the need for curatives, chemical agents, or pre-grinding. The resulting recycled NBR is then used as a matrix for EAF slag particles to produce sustainable rubber compounds that are entirely recycled. Characterization reveals that incorporating EAF slag enhances the devulcanization process of recycled NBR during recycling. The filler grain size affects composite properties like hardness, crosslink density, and tensile modulus, with finer slag particles (<50 μm) exhibiting improved reinforcement due to increased interaction surface with the rubber matrix. Dynamic mechanical analysis indicates that recycled NBR filled with EAF slag exhibits a more significant Payne effect compared to unfilled recycled NBR, due to filler-matrix interactions. Interestingly, EAF slag facilitates the rapid fractional recovery of the low-strain storage modulus after experiencing high-amplitude strain, ascribed to the formation of a rigid rubber layer around the slag particles.
Overall, the findings highlight the potential to valorize these two waste materials effectively by producing functional recycled NBR/EAF slag composites with desirable properties through a simple, industrially viable recycling method without capital-intensive equipment. This represents both environmental and economic benefits through waste valorization and industrial symbiosis.
本研究调查了丁腈橡胶(NBR)下脚料和电弧炉(EAF)炉渣这两种工业废料在开发以电弧炉炉渣为填料的再生丁腈橡胶化合物过程中的应用。采用了一种新的回收丁腈橡胶废料的方法,在室温下进行压延,无需使用固化剂、化学制剂或预研磨。回收的丁腈橡胶可用作 EAF 矿渣颗粒的基质,生产出完全可回收的可持续橡胶化合物。特性分析表明,在回收过程中,加入 EAF 矿渣可增强回收丁腈橡胶的脱硫化过程。填料粒度会影响硬度、交联密度和拉伸模量等复合材料性能,更细的矿渣颗粒(50 μm)会增加与橡胶基体的相互作用面,从而提高补强效果。动态机械分析表明,与未填充的再生丁腈橡胶相比,填充了 EAF 矿渣的再生丁腈橡胶由于填料与基体之间的相互作用而表现出更显著的佩恩效应。总之,研究结果凸显了有效利用这两种废弃材料的潜力,即通过简单、工业上可行的回收方法,无需资本密集型设备,即可生产出具有理想性能的功能性回收丁腈橡胶/高炉矿渣复合材料。这体现了通过废物价值化和工业共生带来的环境和经济效益。
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引用次数: 0
Enhanced methylene blue degradation and miniralization through activated persulfate coupled with magnetic field 通过磁场耦合活化过硫酸盐增强亚甲基蓝降解和微螺旋化作用
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-16 DOI: 10.1016/j.clet.2024.100822
Hossein Abdipour , Ghorban Asgari
In this work, for the first time, the effectiveness of the degradation and mineralization process of methylene blue) MB) was investigated using activated persulfate (PS) with a magnetic field. The effect of various operating parameters, including pH, PS (5–20 mg/L), intensity of the magnetic field (1–4 A), initial concentration of methylene blue dye (25–100 mg/L), and contact time (30–120 min), was evaluated. Process optimization was conducted via the Taguchi model, and the optimal values of these factors were found to be pH = 5, PS = 10 mg/L, MFs = 4 A, reaction time = 30 min, and the initial concentration of methylene blue dye = 50 mg/L. Under optimal conditions, the methylene blue removal efficiency and TOC destruction efficiency reached 91.8% and 88%, respectively. The kinetics of the process followed pseudo-second order (R2 = 0.9723). According to the promising results of the research, the efficiency of dye purification using a magnetic field has increased by about three times compared to the state without this factor. It can be suggested that this system be used as a wastewater treatment process for the textile industry to reduce the toxicity of wastewater and total organic carbon (TOC).
本研究首次利用磁场下的活性过硫酸盐(PS)研究了亚甲基蓝(MB)降解和矿化过程的有效性。研究评估了各种操作参数的影响,包括 pH 值、PS(5-20 mg/L)、磁场强度(1-4 A)、亚甲基蓝染料的初始浓度(25-100 mg/L)和接触时间(30-120 分钟)。通过田口模型对工艺进行了优化,发现这些因素的最佳值为 pH = 5、PS = 10 mg/L、MFs = 4 A、反应时间 = 30 分钟和亚甲基蓝染料的初始浓度 = 50 mg/L。在最佳条件下,亚甲基蓝去除率和 TOC 破坏率分别达到 91.8% 和 88%。该过程的动力学遵循假二阶(R2 = 0.9723)。研究结果表明,使用磁场净化染料的效率比不使用磁场时提高了约三倍。建议将该系统用作纺织工业的废水处理工艺,以降低废水的毒性和总有机碳(TOC)。
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引用次数: 0
Recent advances in harnessing biolubricants to enhance tribological performance and environmental responsibility – Bibliometric review (2015–2024) 利用生物润滑剂提高摩擦学性能和环境责任方面的最新进展--文献计量学综述(2015-2024年)
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-16 DOI: 10.1016/j.clet.2024.100821
Agus Nugroho , Muhammad Kozin , Zhang Bo , Rizalman Mamat , Mohd Fairusham Ghazali , Muhammad Prisla Kamil , Prabowo Puranto , Diah Ayu Fitriani , Siti Amalina Azahra , Kusuma Putri Suwondo , Putri Sayyida Ashfiya
The necessity of conducting research on biolubricants arises from the urgent need to develop sustainable alternatives to conventional petroleum-based lubricants, which contribute to environmental degradation and carbon emissions. As biolubricants offer eco-friendly lubrication solutions, exploring their development and performance is essential to advancing sustainable technologies and achieving global net zero emissions targets. This paper aims to comprehensively plot scientific research outputs on biolubricant manufacturing and recent developments using a quantitative review technique known as bibliometric analysis. The 1000 publications were extracted from the Web of Science database and evaluated with the VOSviewer software. The study examines biolubricants' ability to support sustainability efforts, particularly through their lubrication properties, alignment with Sustainable Development Goals (SDGs), and enhancement with nanomaterials. It also identifies future trends and addresses biolubricants' limitations. The research highlights the significance of the field, with leading journals such as Industrial Crops and Products (34 articles), Tribology International (31 articles), and the Journal of Cleaner Production (29 articles) contributing extensively. The citations and document correlations analysis reveals 742 articles, grouped into 182 publication clusters, showcasing a robust network of influential research. Ongoing bibliometric evaluation is critical for identifying key developments, gaps, and opportunities in sustainable lubrication technologies.
对生物润滑剂进行研究的必要性源于开发传统石油基润滑剂可持续替代品的迫切需要,因为传统石油基润滑剂会导致环境退化和碳排放。由于生物润滑剂可提供生态友好型润滑解决方案,因此探索其开发和性能对于推进可持续技术和实现全球净零排放目标至关重要。本文旨在利用一种称为文献计量分析的定量综述技术,全面描绘有关生物润滑剂制造和最新发展的科研成果。研究从科学网数据库中提取了1000篇论文,并使用VOSviewer软件进行了评估。本研究探讨了生物润滑剂支持可持续发展的能力,特别是通过其润滑特性、与可持续发展目标(SDGs)的一致性以及纳米材料的增强等方面。研究还确定了未来趋势,并探讨了生物润滑剂的局限性。研究强调了这一领域的重要性,《工业作物与产品》(34 篇文章)、《国际摩擦学》(31 篇文章)和《清洁生产期刊》(29 篇文章)等知名期刊对研究做出了广泛贡献。引文和文献相关性分析显示共有 742 篇文章,分为 182 个出版集群,展示了一个强大的有影响力的研究网络。持续的文献计量学评估对于确定可持续润滑技术的关键发展、差距和机遇至关重要。
{"title":"Recent advances in harnessing biolubricants to enhance tribological performance and environmental responsibility – Bibliometric review (2015–2024)","authors":"Agus Nugroho ,&nbsp;Muhammad Kozin ,&nbsp;Zhang Bo ,&nbsp;Rizalman Mamat ,&nbsp;Mohd Fairusham Ghazali ,&nbsp;Muhammad Prisla Kamil ,&nbsp;Prabowo Puranto ,&nbsp;Diah Ayu Fitriani ,&nbsp;Siti Amalina Azahra ,&nbsp;Kusuma Putri Suwondo ,&nbsp;Putri Sayyida Ashfiya","doi":"10.1016/j.clet.2024.100821","DOIUrl":"10.1016/j.clet.2024.100821","url":null,"abstract":"<div><div>The necessity of conducting research on biolubricants arises from the urgent need to develop sustainable alternatives to conventional petroleum-based lubricants, which contribute to environmental degradation and carbon emissions. As biolubricants offer eco-friendly lubrication solutions, exploring their development and performance is essential to advancing sustainable technologies and achieving global net zero emissions targets. This paper aims to comprehensively plot scientific research outputs on biolubricant manufacturing and recent developments using a quantitative review technique known as bibliometric analysis. The 1000 publications were extracted from the Web of Science database and evaluated with the VOSviewer software. The study examines biolubricants' ability to support sustainability efforts, particularly through their lubrication properties, alignment with Sustainable Development Goals (SDGs), and enhancement with nanomaterials. It also identifies future trends and addresses biolubricants' limitations. The research highlights the significance of the field, with leading journals such as Industrial Crops and Products (34 articles), Tribology International (31 articles), and the Journal of Cleaner Production (29 articles) contributing extensively. The citations and document correlations analysis reveals 742 articles, grouped into 182 publication clusters, showcasing a robust network of influential research. Ongoing bibliometric evaluation is critical for identifying key developments, gaps, and opportunities in sustainable lubrication technologies.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100821"},"PeriodicalIF":5.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527328","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}
引用次数: 0
Mechanical behavior of bio-based concrete under various loadings and factors affecting its mechanical properties at the composite scale: A state-of-the-art review 生物基混凝土在各种荷载下的力学行为以及在复合尺度上影响其力学性能的因素:最新综述
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-13 DOI: 10.1016/j.clet.2024.100819
Rafik Bardouh , Evelyne Toussaint , Sofiane Amziane , Sandrine Marceau
The utilization of environmentally friendly materials derived from agricultural sources is becoming more prevalent in the construction industry. Many studies have already been conducted on various agro-resources, providing a variety of information on the characteristics of botanical aggregates and bio-based concrete. However, the prediction of the mechanical behavior of bio-based concrete remains complex owing to the various factors that influence its properties. Hence, it is crucial to collect a multitude of diverse information scattered throughout the literature regarding the mechanical response of bio-based materials under different loading conditions.
This paper review aims to evaluate the mechanical behavior law and mechanical properties of bio-based concrete under various loadings (compression, flexion, and shear) in accordance with multi-plant-aggregates and different mineral binders. The literature has provided around 120 papers listing a compilation of 18 plant aggregates sourced from various origins that are utilized in plant-based concrete. On the other side, a few types of aggregates and binders were introduced in the literature regarding the mechanical behavior of bio-based concrete. Several factors can affect the mechanical properties of bio-based concrete at the composite scale such as the formulation, the casting process (energy), the curing conditions, the morphology of the aggregates, the density, the porosity, the mineral matrix properties, and particles/binder physicochemical interactions. Hence, this paper elaborates on a conceptual understanding that focuses on the mechanical response of bio-based concrete in relation to the various influencing factors up to the application of these materials in building sector.
在建筑业中,利用从农业资源中提取的环保材料正变得越来越普遍。针对各种农业资源已经开展了许多研究,提供了有关植物骨料和生物基混凝土特性的各种信息。然而,由于影响生物基混凝土特性的因素多种多样,对其力学行为的预测仍然十分复杂。因此,收集散见于文献中有关生物基材料在不同荷载条件下的力学响应的各种信息至关重要。本文综述的目的是评估生物基混凝土在不同荷载(压缩、弯曲和剪切)条件下与多植物骨料和不同矿物粘结剂相适应的力学行为规律和力学性能。文献提供了约 120 篇论文,列出了 18 种植物骨料的汇编,这些骨料来自不同的产地,可用于植物基混凝土。另一方面,关于生物基混凝土的力学性能,文献中也介绍了几种骨料和粘结剂。在复合尺度上,有多种因素会影响生物基混凝土的力学性能,如配方、浇注过程(能量)、养护条件、集料形态、密度、孔隙率、矿物基质性能以及颗粒/粘结剂的物理化学相互作用。因此,本文阐述了一种概念性理解,重点是生物基混凝土的机械响应与这些材料在建筑领域应用之前的各种影响因素的关系。
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引用次数: 0
Summer period analysis of the rotary desiccant - hybrid cooling system combined with solid oxide fuel cells using human waste fuel 利用人类废料燃料的旋转干燥器--与固体氧化物燃料电池相结合的混合冷却系统的夏季分析
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-11 DOI: 10.1016/j.clet.2024.100818
Kamil Neyfel Çerçi , Ivo Rafael Oliveira Silva , Önder Kaşka , Kamel Hooman
This paper proposes and simulates a desiccant air cooling system integrated with a vapor compression cooling unit and a heat recovery unit for an office building in Çanakkale, Turkey, during the summer season. The required electrical energy for equipment of the proposed system is supplied by an Solid Oxide Fuel Cells (SOFC) unit using human waste as fuel. Moreover, some of the waste heat generated by the SOFC is used to regenerate the desiccant wheel. The simulation also includes the effects of three different refrigerants for the vapor compression cooling unit. Among the refrigerants, the highest electrical COP was obtained for the system using R1234ze(Z), which is 3.14% and 2.40% higher than the systems using R717 and R1233zd(E), respectively. Additionally, the system using R1234ze(Z) achieved electrical savings of 9.97% and 9.23% compared to the other systems. These electrical savings resulted in fuel savings of 1.19% and 0.90% for R1234ze(Z) compared to R717 and R1233zd(E), respectively. During the summer season, the electricity production from the existing SOFC unit met 82.00% of the total electricity consumption of the desiccant hybrid cooling system. Furthermore, a difference of 3984.56 kWh in primary energy consumption was identified between the desiccant hybrid cooling systems operating with the SOFC and without the SOFC during the summer season.
本文为土耳其恰纳卡莱的一栋办公楼提出并模拟了一套干燥剂空气冷却系统,该系统集成了蒸汽压缩冷却装置和热回收装置,适用于夏季。拟议系统设备所需的电能由固体氧化物燃料电池(SOFC)装置提供,该装置使用人类排泄物作为燃料。此外,SOFC 产生的部分废热还用于再生干燥剂轮。模拟还包括三种不同制冷剂对蒸汽压缩冷却装置的影响。在制冷剂中,使用 R1234ze(Z) 的系统获得了最高的电 COP,比使用 R717 和 R1233zd(E) 的系统分别高出 3.14% 和 2.40%。此外,与其他系统相比,使用 R1234ze(Z) 的系统可节省 9.97% 和 9.23% 的电力。与 R717 和 R1233zd(E)相比,R1234ze(Z)的节电效果可分别节省 1.19% 和 0.90% 的燃料。在夏季,现有 SOFC 设备的发电量满足了干燥剂混合冷却系统总耗电量的 82.00%。此外,在夏季,使用 SOFC 和不使用 SOFC 的干燥剂混合冷却系统的一次能源消耗量相差 3984.56 千瓦时。
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引用次数: 0
Texturized glass in the application of architectural photovoltaics 建筑光伏应用中的纹理玻璃
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-01 DOI: 10.1016/j.clet.2024.100810
Paweł Kwaśnicki
In this work an application of two texturized glasses as a front side material for PV (photovoltaic) system in architectural and designed installation was analysed taking into account optical, topographic, electrical and aesthetic aspects. Since Building Integrated Photovoltaic (BIPV) is becoming increasingly popular, expanding the scope of installation on facades, building walls and various types of glazing its aesthetics aspects become one of the key parameters. For some BIPV application a surface topography such as roughness and or matte surface meeting aesthetic requirements is crucial. Additionally, in the case of installations in urban spaces, an important parameter is the low reflectance value and, consequently, the reduction of light reflections that can blind drivers. The measurements carried out show that the use of glass with a textured surface slightly reduces the electrical parameters of the PV system: around 5% for power (W) while significantly reducing the reflection parameters (light reflection) up to 88% in visible (VIS) region.
在这项工作中,考虑到光学、地形、电气和美学方面的因素,分析了两种纹理玻璃作为光伏(光电)系统正面材料在建筑和设计安装中的应用。由于光伏建筑一体化(BIPV)越来越受欢迎,在外墙、建筑墙壁和各种玻璃上的安装范围也在不断扩大,其美学方面成为关键参数之一。对于某些 BIPV 应用来说,符合美学要求的表面形貌(如粗糙度或哑光表面)至关重要。此外,在城市空间安装的情况下,一个重要的参数是低反射值,从而减少可能使驾驶员失明的光反射。测量结果表明,使用表面有纹理的玻璃可略微降低光伏系统的电气参数:功率(瓦)降低约 5%,而在可见光(VIS)区域,反射参数(光反射)则显著降低达 88%。
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引用次数: 0
Fuzzy optimization of the photo-Fenton process on o-toluidine degradation in the aspect wastewater treatment 模糊优化光-芬顿工艺在废水处理中对邻甲苯胺的降解作用
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-01 DOI: 10.1016/j.clet.2024.100817
Redeil N. Arreza, Alec Nowell A. Ranara, Trisha Kerstin C. Tan, Kathleen B. Aviso, Angelo Earvin Sy Choi
Significant volumes of wastewater, particularly from the textile industry, pose environmental concerns due to the presence of hazardous substances such as ortho-toluidine (OT). The photo-Fenton process can be used to break down and remove this hazardous organic compound. Previous studies on the photo-Fenton process have focused on local optimization of operating variables without considering cost factors. The photo-Fenton process is studied in this paper with UVA irradiation, Fe2+ dosage, and H2O2 concentration considered as variables. The study uses fuzzy optimization in a multi-objective framework for making decisions to determine the optimal values of OT degradation with its corresponding cumulative uncertainty error (YA), and the total operating cost (CT), both of which are essential for assessing the techno-economic feasibility of the process. The Pareto front was generated from the objective functions to establish the boundary limits for YA and CT. The results show an overall satisfaction level of 71.81% for the objective functions, indicating a partially satisficing solution for maximizing OT degradation while minimizing operating cost. The optimum conditions of the variables require 85.70 W m−3 UVA irradiation, 0.5177 mM for Fe2+ dosage, and 7.85 mM for the H2O2 concentration. These conditions yielded an OT degradation value of 83.22% and a total operating cost of 768.61 USD·m−3. Comparison with previous literature showed an OT degradation efficiency that was 16.78% lower. However, this tradeoff in the process efficiency is offset by a total operating cost that is 2.28 times cheaper, emphasizing the cost-effectiveness of the fuzzy optimized solution.
大量废水,尤其是纺织业的废水,因含有邻甲苯胺(OT)等有害物质而引发环境问题。光-芬顿工艺可用于分解和去除这种有害有机化合物。以往对光-芬顿工艺的研究主要集中在操作变量的局部优化,而没有考虑成本因素。本文以 UVA 照射、Fe2+ 用量和 H2O2 浓度为变量,对光-芬顿工艺进行了研究。该研究在多目标框架下使用模糊优化进行决策,以确定 OT 降解的最佳值及其相应的累积不确定性误差(YA)和总运营成本(CT),这两个值对于评估该工艺的技术经济可行性至关重要。根据目标函数生成帕累托前沿,以确定 YA 和 CT 的边界限制。结果表明,目标函数的总体满意度为 71.81%,这表明在最大化 OT 降解的同时最小化运营成本的解决方案部分令人满意。变量的最佳条件需要 85.70 W m-3 的 UVA 照射、0.5177 mM 的 Fe2+ 用量和 7.85 mM 的 H2O2 浓度。在这些条件下,OT 降解值为 83.22%,总运行成本为 768.61 美元-m-3。与以前的文献相比,OT 降解效率低 16.78%。然而,总运营成本降低了 2.28 倍,从而抵消了工艺效率上的折衷,凸显了模糊优化解决方案的成本效益。
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引用次数: 0
Adaptive reuse of waste plastic as binders in composites for sustainable construction 将废塑料作为复合材料的粘合剂进行适应性再利用,实现可持续建筑
IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Pub Date : 2024-10-01 DOI: 10.1016/j.clet.2024.100812
Babatunde Olawale Yusuf , Tareg Abdalla Abdalla , Turki S. Alahmari , Raouf Hassan
Effective and efficient handling of solid waste remains a significant issue, particularly in low- and middle-income countries, and densely populated urban areas. Waste plastic is identified as a major contributor to solid waste streams. This study highlighted the viable reuse of waste Linear low-density polyethylene (LLDPE) plastic as a binder and full replacement for cement in composite blocks. An extrusion technique was adopted to melt the plastic and mix it with the sand fillers to create a homogenous waste plastic binder composite block. Composite block samples were produced at various mixture ratios of 1:1, 1:2, and 1:3 with waste plastic or cement as binder and sand as filler. The composite samples' compressive strength, flexural strength, tensile strength, UPV, thermal conductivity, skid resistance, Cantabro mass loss, and morphology were investigated. In addition, the thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis of the composites were carried out. The results showed that composite blocks containing waste LLDPE plastic as binder exhibited lower compressive strength, higher flexural strength, and tensile strength, better thermal insulation, and abrasion resistance compared to composite blocks containing cement as binder. Meanwhile, the cement binder composite gave better skid resistance when the surface was wet than the waste plastic binder composite. However, the waste LLDPE plastic composite mixes considered gave compressive strength above 5 N/mm2, which is the minimum requirement for building bricks according to BS 3921: 1985.
有效和高效地处理固体废物仍然是一个重大问题,尤其是在中低收入国家和人口稠密的城市地区。废塑料被认为是固体废物流的主要来源。这项研究强调了废弃线性低密度聚乙烯(LLDPE)塑料作为粘合剂的可行再利用,以及在复合砌块中完全替代水泥。研究采用挤压技术熔化塑料,并将其与砂填料混合,制成均匀的废塑料粘合剂复合砌块。以废塑料或水泥为粘合剂,沙子为填料,按 1:1、1:2 和 1:3 的不同混合比例制作了复合砌块样品。研究了复合材料样品的抗压强度、抗弯强度、抗拉强度、UPV、导热性、防滑性、Cantabro 质量损失和形态。此外,还对复合材料进行了热重分析(TGA)和差示扫描量热分析(DSC)。结果表明,与以水泥为粘合剂的复合砌块相比,以废弃低密度聚乙烯塑料为粘合剂的复合砌块具有更低的抗压强度、更高的抗弯强度和抗拉强度、更好的隔热性能和耐磨性。同时,与废塑料粘结剂复合材料相比,水泥粘结剂复合材料在表面潮湿时具有更好的防滑性。不过,根据 BS 3921 标准,废旧 LLDPE 塑料复合材料的抗压强度高于 5 牛顿/平方毫米,这是建筑用砖的最低要求:1985.
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Cleaner Engineering and Technology
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