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Biogeosynthetic recycling of iron-ore tailings for green stabilization of expansive soils
(2026-07-01)
Mehmood, Mudassir
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Nie, Wen
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Liu, Yunlong
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Onyelowe, Kennedy
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Jalal, Fazal E.
Expansive soils pose a significant challenge to civil infrastructure due to their high potential for expansion and contraction. These soils exhibit poor mechanical properties, leading to severe structural damage and high maintenance costs. To address these challenges, conventional stabilization like cement or lime, are widely used; however, their production substantially increases global carbon dioxide emissions and energy requirements. Therefore, there is an urgent need to develop sustainable alternatives that enhance soil performance while minimizing environmental impact by utilizing industrial by-products. In response to this need, this study proposes a sustainable composite reinforcement scheme that combines enzyme-induced carbonate precipitation (EICP), sisal fiber (SFs) reinforcement, and iron ore tailings (IOts) to treat expansive soil by deploying laboratory testing and response surface modeling (RSM). Utilizing the experimental and validated optimal mix (0.75 mol/L EICP + 0.53 % SFs + 11.7 % IOts) reduced swelling pressure ∼98 % while increasing the unconfined compressive strength ∼262 %, cohesion ∼78 %, the angle of internal friction ∼172 %, Unsoaked California Bearing Ratio (CBR<inf>unsoak)</inf> from 2.4 % to ∼26 % and CBR<inf>soak</inf> 1.7 % to ∼20 % after 28 days curing. In addition, SEM and EDS analyses confirmed synergistic microstructural interactions, resulting in a highly reinforced soil composite. Moreover, the RSM model showed good agreement with the experimental results, with errors controlled within ±5 %, validating the robustness of the model. By reusing mining waste and utilizing renewable fibers, this approach demonstrates a low-carbon, cost-effective, and scalable stabilization strategy that enhances infrastructure resilience and promotes circular economy objectives.
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Sustainable Air Purifiers for Thai Smart Cities: Integrating Circular Economy and Public Health in Municipal Innovation
(2026-06-01)
Taghipour, Amirhossein
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Saengnoree, Amnuay
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Sangmanee, Woranat
Rapid urbanization and economic growth in Thailand have intensified urban air-quality challenges, especially PM2.5 pollution associated with agricultural burning, industrial emissions, and traffic congestion. Municipal governments are therefore exploring technological interventions that can complement conventional emission-control policies in the transition toward healthier smart cities. One promising approach is the deployment of sustainable outdoor air-purifier towers equipped with high-speed fans, jet scrubbers, and IoT-based monitoring systems. Early pilots, including the MQDC FahSai Mini tower, have demonstrated substantial dust-reduction potential and real-time data integration with public air-quality platforms. This study develops an interdisciplinary framework that connects public health, circular economy principles, technology adoption, and sustainable urban design. We examine how environmental awareness, perceived effectiveness, social influence, perceived cost, health anxiety, and value co-creation shape adoption intention and behavior toward municipal air-purification systems in Bangkok, Chiang Mai, Khon Kaen, and Phuket. Using mixed methods, including interviews and survey data from 320 stakeholders, residents, and officials, and analyzing the data through CFA and SEM, the study finds that environmental awareness and perceived effectiveness positively influence adoption, while perceived cost reduces it. Value co-creation emerges as the strongest driver of adoption intention and mediates the role of social influence. Scenario analysis further indicates that the deployment of 10–15 purifier towers could reduce PM2.5 by approximately 30–40% and generate meaningful health-related economic benefits. The discussion now more explicitly addresses the end-of-life management of saturated filter media, the role of multi-level governance and redistributive financing for urban equity, and the importance of addressing technological anxiety to secure a durable social license for deployment.
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Utilization of coconut meal waste as a filler in a starch-based bioplastic and its application
(2026-05-01)
Tankaew, Saichon
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Phonsing, Benjamat
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Sukolrat, Apinya
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Torpee, Salwa
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Kaewtatip, Kaewta
This research focuses on the utilization of coconut meal waste (CM) as a filler for a bioplastic made from cassava starch. The study investigates the effects of different CM contents (0, 2, 4, 6, 8, and 10 wt%) on the properties of the bioplastic. The addition of 2 wt% CM provided the best performances in terms of tensile strength, and water and weathering resistance. Strong hydrogen bonding between starch and CM contributed to the performance of the biocomposite. The optimized composite was used to fabricate biodegradable seeding pots, which were coated with Bacillus thuringiensis strain SL56, known for its plant growth-promoting properties. Chinese cabbage grown in the fabricated pots showed significantly enhanced seedling height and leaf number. This study demonstrates the potential of seeding pots made from a starch/CM biocomposite coated with beneficial microbes as eco-friendly alternatives to conventional seeding pots. The proposed product provides a use for an agricultural waste and aligns with the principles of a circular economy and sustainable development.
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Circular economy: the properties of fiber from Sansevieria stuckyi god–leb. Applied to green textile innovation based on eco-friendly local wisdom
(2026-01-01)
Yabdee, Sudakan
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Kijmongkolvanich, Sirisyos
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Egwutvongsa, Songwut
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Piromgarn, Thanate
This mixed-method research examined the physical properties of Sansevieria stuckyi God–Leb. fiber for textile product design using a tensile testing machine, with the results subjected to multiple regression analysis (MRA) and exploratory factor analysis (EFA). Four factors were considered for textile product designs, including (1) local wisdom, (2) local economy, (3) creative economy, and (4) environmental sustainability. Sansevieria stuckyi God–Leb. fibers blended with rayon and cotton were optimal for the development of textile products. The fiber designs enhanced the quality of woven fabrics in the local community and promoted public interest in economic, cultural, and environmental opportunities through new textile products that align with the 21<sup>st</sup> century.
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Biodiesel production from spent coffee grounds via ethanolic extraction and supercritical ethanol transesterification: technoeconomic analysis and life cycle assessment
(2026-01-01)
Supang, Wirasinee
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Ngamprasertsith, Somkiat
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Nimmanterdwong, Prathana
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Sakdasri, Winatta
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Hunsub, Panusorn
Previous studies have developed biodiesel production methods from spent coffee grounds (SCGs) via ethanolic extraction and supercritical ethanol transesterification (EE-SET) to minimize the energy consumption associated with solvent evaporation. In this study, we perform a technoeconomic analysis (TEA) and a life cycle assessment (LCA) to evaluate the profitability and sustainability of EE-SET. The material and energy balances in the TEA and LCA were derived from Aspen Plus<sup>®</sup> V12 based on experimental data from previous research. The results from the base case indicated that EE-SET was unprofitable and posed a considerable environmental burden by disposing of defatted SCG (DSCG) as solid waste due to two main issues. First, the amount of DSCG was 4.8 times greater than the total biodiesel and glycerol produced. Second, landfilling DSCG incurred waste treatment costs and induced greenhouse gas (GHG) emissions simultaneously. Selling DSCG as a feedstock for solid fuel pellets offers an effective strategy for achieving profitability and sustainability. As such, EE-SET addresses the economic drawback of generating profit from selling DSCG while reducing waste treatment costs. Using DSCG as a solid fuel for environmental benefits increases ash disposal credit and substantially reduces GHG emissions. The incorporation of pelletizing units or biomass power plants into EE-SET represents a promising avenue for future research.
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Water Footprint of the business Sector and Circular Economy
(2023-01-01)
Taghipour, Amirhossein
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Stefanakis, Alexandros
Water is vital in metal extraction and manufacturing. Grinding, flotation, gravity concentration, medium separation, and hydrometallurgical processes all use it. The kind of ore treated, the processing techniques, and the local climate all influence water use. Water is also required for dust suppression, cooling, equipment washing, and human consumption in mining operations. To drill for fossil fuels, for example, or to cool boilers and emission control systems in thermoelectric power plants, water is required throughout the entire life cycle of mining. In this study, a life cycle inventory is conducted to quantify water inputs and outputs, and a life cycle impact assessment to quantify possible environmental harm. Metals’ water impacts are significant due to direct and indirect water use in mining and production, fuel extraction, and energy production, as well as sulfidic mine tailings disposal. To improve supply chain water efficiency, properly manage mining tailings, and boost the use of low-carbon and low-water energy sources and conversion technologies, the consumer electronics sector must work with suppliers to build long-term water management initiatives. Although strategies and the substitution or reduction of high-impact materials can help reduce water impacts, they may also entail sustainability trade-offs that must be evaluated and addressed in advance. To effectively connect design and material decisions to product consumption, longevity, and end-of-life management, supply chain coordination is required. Additional interventions, such as expanded producer responsibility policies, enhanced consumer participation, and increased supply chain transparency, will most likely be required to meet these aims.
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The impact of government policies and steel recycling companies' performance on sustainable management in a circular economy
(2022-08-01)
Taghipour, Amirhossein
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Akkalatham, Wareerath
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Eaknarajindawat, Natnaporn
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Stefanakis, Alexandros I.
The purpose of this study was to determine how government policies affect the sustainable management in a circular economy in steel recycling manufacturing companies using Thailand as a case study. To develop and examine a structural equation model, a set of management sustainability indicators from previous studies was used. The study target's (steel recycling manufacturers) behavior was quantitatively analyzed using questionnaire-based surveys. The literature has rarely seen interactions between disparate research structures as a means of integrating circular economics, such as the intricate relationship between government policy and longer product life cycles, steel recycling, and sustainable circular economy management research. In the absence of the ability to regulate government benefits through businesses, businesses will speak to influence policy. It was found that broad enablers such as financial assistance, logistics, and fundraising guidance significantly influenced government policy solutions in the steel sector. Government policies promoting direct and indirect investment as a result of the adoption of the circular economy also heavily rely on infrastructure. Understanding how this policy affects customer perceptions and behavior enables businesses to continue advocating for the positive impact of policymaking on governments, industries, and customers. There is still room for additional research to examine the implications of various policies in different regions in order to determine those policies that are most likely to succeed.
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Circular Economy of Steel Recycling Companies in Thailand
(2021-11-01)
Taghipour, Amirhossein
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Akkalatham, Wareerath
The new “circular economy” model would revolutionize the economy. It should also be noted that several business models will be needed to optimize their efficiency and overlap as the system evolves over its lifetime. The business model of the circular economy is based on the principle of “value creation” of the conventional economy. In this study, we interviewed 67 managers from the steel industry in Thailand. Statistically, 71.2% of respondents felt that steel consumers would be able to pay a higher price for clean goods. Also, 87% believe that governments must contribute to the development of the circular economy. They said that their group also organizes training activities for educating the workforce. Moreover, 80.1% indicated that their organization must inform management and workers of the value of the circular economy. Accordingly, 64.7% of respondents stated that there is no government funding for scrap metal recycling. Overall, 36.3% of people felt there was a shortage of scrap metal work.

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