Cleaner Engineering and Technology最新文献

{"title":"Reuse of building materials—the perspective of Swedish clients","authors":"Filip Ericsson ,&nbsp;Kristina Mjörnell ,&nbsp;Ulla Janson","doi":"10.1016/j.clet.2024.100848","DOIUrl":"10.1016/j.clet.2024.100848","url":null,"abstract":"<div><div>In the context of the circular economy, there is an urgent need for transformation into circular material flows by avoiding waste, reducing extraction of virgin raw materials, and extending product life cycles. Within the construction and real estate industry, the reuse of building materials stands out as a critical strategy for value retention. The objective of this paper is to localise the forefront of the practical implementation of reused materials within the Swedish construction and real estate industry. To achieve this, the current state of reuse practices through the perspective of property companies as clients in decision-making positions was conducted through semi-structured interviews to identify key barriers and enablers associated with reuse. The three most significant barriers that emerged were a lack of measurable economic incentives, the absence of a professional reuse market, and obsolete project management. Conversely, the three most significant enablers were new and improved project management methods, enhancing competence and learning within and beyond organisations, and introduce reuse at an early stage. The results emphasise the need for project management to develop and adopt circular economy principles. This is further understood due to responders highlighting the industry's linear approach as a major obstacle to circularity together with uncertainties related to product performance, responsibilities and economics characterising reuse efforts. However, an industry in transition is witnessed, e.g. by the emergence of new roles which suggests a continued need for focused research in organisational matters.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100848"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759502","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":"Synthesis and application of natural clam shell derived adsorbents for removal of azo dyes from wastewater","authors":"Mandeep Kaur ,&nbsp;Deepak Rohilla ,&nbsp;Moondeep Chauhan ,&nbsp;Vineet Kumar ,&nbsp;Kulvinder Singh","doi":"10.1016/j.clet.2024.100854","DOIUrl":"10.1016/j.clet.2024.100854","url":null,"abstract":"<div><div>The research aims to evaluate effectiveness of natural clam shell derived adsorbents for the treatment of azo dyes. The nanomaterials were synthesized via hydrothermal methods, and their adsorption capacities were scrutinized against a spectrum of dyes, including methylene blue (MB), crystal violet (CV), rhodamine B (RB), malachite green (MG), safranin (SR), as well as commercial red and blue dyes. Remarkably, the clam shell nanoparticles (CSNPs) exhibited notable dye removal efficiencies, achieving removal rates of approximately 87%, 89%, 97.75%, 97.60%, and 97.11% for MB, RB, CV, MG, and SR, respectively. These removal rates were accomplished within varied interaction times ranging from 45 to 10 min, utilizing a dose of 100 mg/L of nanoadsorbent. Furthermore, the nanomaterials displayed removal efficiencies exceeding 80% against commercial blue and red dyes. Considering their exceptional adsorption capacities, clam shell nanomaterials stand out as cost-effective, efficient, and environmentally friendly biosorbents for effectively removing dyes from aqueous solutions. This study highlights the promising potential of clam shell-based nanomaterials in addressing the challenges presented by water pollution.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100854"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141247","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":"Oxygen plasma treatment to mitigate the shedding of fragmented fibres (microplastics) from polyester textiles","authors":"Abdul Jabbar ,&nbsp;Michael Bryant ,&nbsp;Josh Armitage ,&nbsp;Muhammad Tausif","doi":"10.1016/j.clet.2024.100851","DOIUrl":"10.1016/j.clet.2024.100851","url":null,"abstract":"<div><div>The release of fragmented fibres (FFs) during the manufacture and service life of textiles is one of the key sources of microplastic pollution. Polyester (polyethylene terephthalate (PET)) is the most widely used fibre with production volume of 63 million tonnes - represents 55% of all textile fibres and 80% of synthetic fibres. The impact of textile material and structural variables as well as chemical modification of textiles to mitigate the release of FFs has previously been reported. For the first time, the current research brings together disciplines of textile technology and tribology to understand the impact of inter-fibre friction on the release of FFs. The oxygen plasma, a sustainable alternative approach to chemical treatment methods, was employed to alter the surface morphology and consequently the frictional behaviour of fibre surfaces and eventually its impact on the release of FFs. Using commercially relevant methods, bespoke polyester fabric was manufactured and treated with low pressure oxygen plasma. The treated and untreated samples were characterised for surface roughness (fibre surface profilometry), coefficient of friction (nanotribometer), FFs shedding, shear properties and wettability. An increase in surface roughness of polyester fibres was observed after the treatment. The oxygen plasma treatment significantly increased the coefficient of friction, shear hysteresis, wettability and reduced the FFs shedding by 43 % in mass (accumulative of prewash and 5 accelerated washes) and 73 % in count (number) compared to untreated sample, without impacting the fabric handle and imparting hydrophilic property. Strong negative correlations between shed FFs and fabric coefficient of friction (r = −0.907 for FFs mass and r = −0.918 for FFs count) were observed. The outcomes of this study confirm that the fibre tribological properties can play a role to modulate the release of FFs from polyester textiles, using a sustainable method of plasma treatment technology.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100851"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141249","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":"Synthesis of eco-friendly alkali-activated materials based on incineration by-products and cigarette filters: A Novel Approach to Address Cigarette Pollution","authors":"Hamza El Fadili ,&nbsp;Mohammed Ben Ali ,&nbsp;Azzedine Moussadik ,&nbsp;Mohammed El Mahi ,&nbsp;Md Naimur Rahman ,&nbsp;El Mostapha Lotfi","doi":"10.1016/j.clet.2024.100849","DOIUrl":"10.1016/j.clet.2024.100849","url":null,"abstract":"<div><div>Using waste as a raw material for the synthesis of construction materials is gaining increasing attention due to the declining availability of natural resources. This research seeks to assess the impact of using cellulose acetate microfibers (CAMs) derived from discarded cigarettes as a reinforcement for alkali-activated materials (AAMs). In this context, seven blends were elaborated with the addition of various percentages of CAMs (0%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, and 1.5%) per dry mass of fly ash, and using an alkaline solution composed of Na₂SiO₃ and 10 M NaOH solution. Then the physico-mechanical, thermal, and environmental properties of these composites were evaluated. The experimental results indicated that the addition of CAMs led to lighter composites, which decreased compressive strength, P-wave velocity, and density, while slightly increasing flexural strength, porosity, and water absorption. Moreover, a slight enhancement in thermal insulation capacity was observed (up to ∼9.28%). The microstructural analyses, encompassing XRD, FT-IR, and SEM/EDX examinations, revealed the formation of geopolymeric gels N-A-S-H and C-A-S-H in all specimens. The Toxicity Characteristic Leaching Procedure indicated that the released contaminants were within the regulatory limits, as well as the binder exhibited a remarkable decrease in carbon dioxide emissions and energy demand by 77.23% and 57.92% in comparison to cement. Thus, the prepared materials are viewed as a more environmentally responsible choice for reducing greenhouse gas emissions while avoiding potential toxicity issues.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100849"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141251","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":"Life-cycle environmental assessment of ultra-high-performance concrete with sustainable materials and fiber substitutions","authors":"Leila Farahzadi ,&nbsp;Lars Gunnar Furelid Tellnes ,&nbsp;Behrouz Shafei ,&nbsp;Mahdi Kioumarsi","doi":"10.1016/j.clet.2024.100846","DOIUrl":"10.1016/j.clet.2024.100846","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) stands at the forefront of cementitious materials used for construction, owing to its unparalleled strength and durability. However, the high cement content and excessive use of steel fibers in the conventional UHPC pose significant carbon dioxide emission and environmental challenges, necessitating the exploration of sustainable alternatives. This study asseses the potential environmental impact reduction achieved by incorporating sustainable materials in UHPC mixtures. The research focuses on replacing conventional UHPC materials with Portland limestone cement (PLC), recycled glass powder, and polyester fibers as lower-impact alternatives. The UHPC mixtures are chosen in a way that falls under the same compressive strength class and offers similar performance characteristics. A life cycle assessment (LCA) methodology is employed to evaluate the environmental performance of different UHPC mixtures. The LCA follows a cradle-to-gate approach, considering key factors such as global warming potential (GWP), energy use, raw material extraction, transportation, and production processes. The results show that substituting ordinary Portland cement (OPC) with PLC and incorporating recycled glass powder reduced the GWP of UHPC mixtures by up to 17%. Moreover, partially replacing steel fibers with polyester fibers further reduced the GWP by 29%. These findings highlight the potential for significant environmental impact reductions in UHPC production through material optimization, contributing to more sustainable construction practices without compromising mechanical performance.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100846"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141253","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":"Sustainable Approach for Development of cut-resistance seamless gloves using recycled para-aramid/cotton blends","authors":"Guruswamy Krishna Prasad ,&nbsp;Nandan Kumar ,&nbsp;Nachimuthu Shanmugam ,&nbsp;A.S.M. Raja ,&nbsp;Kasilingam Rajkumar ,&nbsp;Anwar Hussian ,&nbsp;Seema Patel","doi":"10.1016/j.clet.2024.100859","DOIUrl":"10.1016/j.clet.2024.100859","url":null,"abstract":"<div><div>The main objective of this study was to develop sustainable, comfort and cost-effective durable cut-resistant gloves using recycled para-aramid and cotton. Recycled para-aramid fibres were blended with cotton in different blend proportions of 90/10, 30/70, 50/50, 70/30 and spun into yarn of 29.5 tex. A 100% cotton yarn of similar fineness was also spun for comparative purposes. All the developed yarns were then knitted into seamless gloves of 250 g/m². The gloves were tested for their performance properties such as cut-resistance, abrasion, limited flame spread, and contact heat resistance as per applicable EN &amp; ISO standards. The gloves made from 70/30 recycled para-aramid and cotton showed better performance properties with level C cut resistance, level 4 limited flame spread and level 1 contact heat resistance. The knitted gloves were also analysed for air permeability, <em>q</em> _<em>max</em> (Peak heat flux), and the Moisture vapor transmission rate (MVTR). It is found that addition of cotton up to 30% in the gloves improved the <em>q</em> _<em>max</em> and MVTR values without compromising the cut resistance properties. The longitudinal structural study of recycled para-aramid fibres using SEM showed flat and twisted structure with fibre breakage due to fibrillation and stress created during recycling compared cylindrical shape of virgin para-aramid fibre.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100859"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141627","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":"Managing demolition wastes using GIS and optimization techniques","authors":"Mohamed Marzouk ,&nbsp;Eman Othman ,&nbsp;Mahmoud Metawie","doi":"10.1016/j.clet.2024.100852","DOIUrl":"10.1016/j.clet.2024.100852","url":null,"abstract":"<div><div>Egypt has experienced vast urbanization and expansion in existing highways, leading to much demolition waste. Construction and demolition waste constitutes around half of the total municipal waste. So, these wastes must be appropriately managed to decrease their negative impacts. As a result, this research presents a framework that automatically detects demolishing wastes' location and optimizes utilized resources in demolition and transportation processes. It consists of three main components: the GIS module, the optimization module, and the decision-making module. Based on the raster image of the study region, the framework detects existing buildings that should be demolished to enable highways’ expansion. The GIS module is designated to quantify the volume of demolition waste in the studied area using ArcGIS Pro software. The optimization module determines the near-optimum combination of resources involved in the demolition process and waste transportation. These resources include labor crews, excavators, and trucks. The module performs multi-objective optimization using a non-dominated sorting genetic algorithm (NSGA-II). The optimization module considers three objectives in demolition and transportation processes: time, cost, and energy consumption. Finally, the decision-making module is developed to rank the Pareto front solutions. The Entropy Weight Method (EWM) is used to identify the weights of the three criteria. The estimated weights for time, cost, and energy consumption are 38.6%, 17.3%, and 44.1%, respectively. Subsequently, the TOPSIS technique is utilized to normalize, rank, and select the best solution. The proposed framework is applied to an actual case study that involves expanding the ring road project in Cairo to demonstrate its main features.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100852"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141248","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":"Heat pump evaporation: An alternative of membrane filtration system aiming pure water production","authors":"Reem Shaheen,&nbsp;Krisztián Kovács,&nbsp;Edit Cséfalvay","doi":"10.1016/j.clet.2024.100847","DOIUrl":"10.1016/j.clet.2024.100847","url":null,"abstract":"<div><div>The daily electrical power generation and consumption in Hungary were analyzed, and a 2-h-long interval was specified for the 5000 MW excess power generation, and 1,500,000 MJ energy was identified as an excess. Two pure-water-producing systems (membrane-based system and heat pump evaporator) were compared to utilize this excess electrical energy at industrial scale. Heat pump evaporation was tested as an alternative method for pure water production because its role in pure water production hasn't been discussed. Suspended-solid-free feed water was used for both systems. Lab-scale experiments proved that in the case of freshwater, the four-step membrane filtration technology can be replaced by a one-step heat pump evaporation, resulting in almost the same quality of pure water characterized by the conductivity; 2 and 4 μS/cm for membrane filtration and heat-pump evaporation, respectively. When using seawater at a lab-scale, the proposed membrane technology resulted in desalted water having a conductivity of 425 μS/cm; meanwhile, by heat pump evaporation, pure water could be attained, having a conductivity of 19 μS/cm. Considering the specific electric energy consumption at laboratory scale, the one-step heat pump evaporator surely exhibits an energy-saving method for pure water production; 6.12 MJ/L and 2.31 MJ/L were measured for membrane system and heat pump evaporator, respectively. Considering an industrial-scale make-up water demand, up-scaling calculations, including hydraulic calculations and pump selection producing the same amount of pure water, resulted in a reverse trend regarding specific electric energy consumption; 25.35 MJ/m³ and 14,850 MJ/m³ estimated for membrane system and heat pump evaporator, respectively. Both systems were analyzed in terms of environmental impacts. According to wastewater quality and their disposability, the wastewater of freshwater treatment can be drained into the sewage system, but in case of seawater, crystallization of concentrated NaCl solutions is possible. Based on our analysis, the theoretically producible water quantity is more than physically attainable by the treatment technologies, thus more options shall be considered for the utilization of excess energy generation.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100847"},"PeriodicalIF":5.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141250","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":"Towards low-carbon travel trips through carbon footprint: A case study of marine tourism in Sichang Island, Thailand","authors":"Thammananya Sakcharoen ,&nbsp;Wilailuk Niyommaneerat ,&nbsp;Thapat Silalertruksa","doi":"10.1016/j.clet.2024.100840","DOIUrl":"10.1016/j.clet.2024.100840","url":null,"abstract":"<div><div>The growing concern over climate change has heightened the need for low-carbon tourism practices. The study aims to evaluate the carbon footprint of marine tourism on Sichang Island, Thailand. The carbon footprint assessment is set for the three travel trips identified based on the tourist's lifestyle: Route I: Merit-making trip, Route II: Nature trip, and Route III: Relaxation, Adventure, and Education. The greenhouse gas (GHG) emissions calculation under each travel trip covers transportation, accommodation, meals, recreational activities, and waste management. The results revealed that the total GHG emissions for tourism routes I, II, and III are 9.9, 10.5, and 26.2 kg CO₂e/person/trip, respectively. The study has analyzed the variations in carbon footprint results based on factors including the modes of transportation, i.e., ferry rides, high-speed boats, motorized three-wheeled vehicles (Tuk-Tuk), motorcycle and car rental; types of accommodation; food and beverage menu; recreational and marine tourism activities and solid waste management practices. The major contributors to the GHG emissions of routes I and II are the sea transport, meals, and land transport on the island. Route III has the highest carbon footprint because of the accommodation required for the tour program. The obtained carbon emission factors can be used to plan and manage marine tourism activities. By comparing activities, stakeholders can make informed decisions to minimize carbon footprints. The carbon emission reduction measures and the effective carbon offset programs for the island have been recommended.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100840"},"PeriodicalIF":5.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706235","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":"Recent advances of plant growth promoting rhizobacteria (PGPR) for eco-restoration of polluted soil","authors":"Mohd. Zobair Iqbal,&nbsp;Kshitij Singh,&nbsp;Ram Chandra","doi":"10.1016/j.clet.2024.100845","DOIUrl":"10.1016/j.clet.2024.100845","url":null,"abstract":"<div><div>The emergence of several complex environmental pollutants from various industrial activities has posed a global challenge for ecorestoration and sustainable development. The use of Plant Growth-Promoting Rhizobacteria (PGPR) for the remediation of soil pollution has gained recognition as a promising biotechnological tool for sustainable development. Recent advances in metagenomic approaches have allowed for the detection of rhizospheric bacterial communities from polluted soils revealing their contributions to the degradation of complex pollutants through the production of potential enzymes as a novel technique. In addition, protein/enzyme engineering and the fate of heavy metals accumulation in plant tissues, through bacterial-assisted phytoremediation, has expanded the role of PGPR in soil reclamation by improving their efficacy, understanding their mechanisms of action, and integrating them with other innovative approaches been reported as advance technique. These advancements give strong evidence for more efficient and sustainable soil remediation strategies, aiding in the restoration of contaminated soil and ensuring environmental sustainability. These techniques and PGPR attributes will provide a green technology for environmental safety.</div></div>","PeriodicalId":34618,"journal":{"name":"Cleaner Engineering and Technology","volume":"23 ","pages":"Article 100845"},"PeriodicalIF":5.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722483","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}