Article
Engineering, Geological
Shengwei Wang, Bangbang Lu, Wei Zhu
Summary: Clay is widely used in landfill projects due to its low permeability. However, the threshold gradient characteristic of clay can impact the service life of landfill barriers. This paper conducted permeability tests on seven clays and established a relationship between permeability and the threshold gradient. It also analyzed the service life of clay barriers under different conditions using numerical analysis. The study found that the composition of clay affects its threshold gradient and identified the barrier breakdown indicator pollutant in different scenarios.
Article
Multidisciplinary Sciences
Chairat Teerawattanasuk, Panich Voottipruex, Suksun Horpibulsuk
Summary: This study demonstrates that cement treatment significantly improves the lead immobilization properties of compacted clay liners, reducing lead leaching and showing potential for managing contamination dissipation of industrial waste in landfills.
Article
Engineering, Environmental
Shi Shu, Wei Zhu, Xihui Fan, Silin Wu, Yunquan Li, Charles Wang Wai Ng
Summary: The study found that under competitive adsorption conditions, the presence of competing pollutants decreased the adsorption of target pollutants on clay. Additionally, the presence of competing pollutants accelerated the speed at which pollutants passed through the CCL, reducing breakthrough times.
WASTE MANAGEMENT & RESEARCH
(2021)
Article
Engineering, Environmental
Yu Tan, Poyu Zhang, Jiannan Chen, Ryan Shamet, Boo Hyun Nam, Hefu Pu
Summary: MLMs were developed to predict hydraulic conductivity of compacted soil barriers for landfill construction. Three machine learning algorithms were used to develop MLMs, and the random forest model provided the most accurate prediction.
Article
Engineering, Environmental
Mehmet Sukru Ozcoban, Seren Acarer, Nese Tufekci
Summary: This article examined the change in hydraulic conductivity of landfill liners caused by contaminants in leachate and the mechanisms responsible for this change. It identified deficiencies in the literature on this topic and presented directions for future studies.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Shaojie Wen, Wen-Chieh Cheng, Wenle Hu, Dongfeng Li, Longtan Shao
Summary: In China, municipal solid waste with a high amount of kitchen waste has lower cellulose content and faster CH4 generation rate, leading to the emission of hazardous gases and increase in gas pressure in landfill cover systems. This study investigated the effect of temperature on the gas breakthrough pressure and permeability of compacted loess. The results showed that temperature affects water permeability, intrinsic permeability, and capillary pressure, providing important guidance for the design of landfill covers.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Geological
Chandra Bhanu Gupt, Sanandam Bordoloi, Metta Niranjan Bhatlu, Sreedeep Sekharan
Summary: This study determined the upper and lower bounds of equilibrium hydraulic conductivity of amended B under extended flow duration. The results showed significant differences between constant-volume and free-swelling conditions due to geomaterial interaction and mineralization. The study also proposed empirical relationships for estimating long-term hydraulic conductivity based on short-term results, plasticity, and geomaterial type. Overall, this study highlights the potential use of alternative amendment materials and the importance of considering free-swelling conditions in liner design.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Engineering, Environmental
Young Su Lee, Yeong Min Kim, Jongkeun Lee, Jae Young Kim
Summary: This study evaluated landfill liners as a final barrier to silver nanoparticles (AgNPs) and found that the liners demonstrated significant sorption of AgNPs, effectively blocking their penetration. The results provide valuable insights into the fate and transport of nanomaterials in landfill environments and suggest that current sanitary landfill liners show resistance to AgNP migration.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Geological
Huaxiang Yan, Haijian Xie, Hao Ding, Dandi Yang, Cong Chen, Yunmin Chen, Yun Chen
Summary: A composite liner system consisting of a geomembrane layer, a compacted clay layer, and an attenuation layer is widely used in landfills. Consolidation of the soil liner can have detrimental effects on contaminant breakthrough, particularly under relatively high stress caused by waste placement. This study develops a one-dimensional model to investigate the transport behavior of contaminants in the composite liner system considering consolidation. The results show that the volume compressibility coefficient in the attenuation layer and the thickness of the attenuation layer play important roles in controlling the consolidation induced effects.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Environmental
Elmira Khaksar Najafi, Reza Jamshidi Chenari, Meghdad Payan, Mahyar Arabani
Summary: Geopolymers, made from clay and fly ash, have high sorption capacity, mechanical strength, and durability, making them suitable for landfill liners. The geopolymers meet various criteria for liner materials, with a altered clay structure contributing to a more sustainable material. Additionally, the binding agents create coagulated particles covered by aluminosilicate gels, enhancing sorption capacity and resistance to freeze-thaw cycles.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Xing Zeng, Jia Su, Hengyu Wang, Tong Gao
Summary: This study simulated the complete breakthrough process of chloride ions in low-permeable clay barriers and found that the breakthrough time of strongly adsorptive pollutants was significantly affected by R-d.
Article
Computer Science, Interdisciplinary Applications
Yu-Chao Li, Shi-Yuan Yao, Cheng Chen, Yun-Min Chen, Guan-Nian Chen, Ri -Hong Zhang
Summary: Geomembranes in landfill composite liners often have long defects, which can lead to underestimation of leakage rate. In this study, a new solution considering two-dimensional flow in the compacted clay liner (CCL) was proposed to predict the leakage rate through GMB/CCL composite liners. The proposed solution showed lower relative errors for leakage rate and wetted distance compared to the existing solution.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Environmental Sciences
Amin Falamaki, Mahdi Salimi, Amir Hossein Vakili, Mehdi Homaee, Marzieh Aryanpour, Maryam Sabokbari, Reza Dehghani, Kourosh Masihzadeh, Amir Hossein Karimi
Summary: This study investigated the effect of leachate on the geotechnical parameters and cracking behavior of compacted clay liners (CCLs) with various percentages of polypropylene fibers. Laboratory tests were conducted on 200 compacted clay samples reinforced with different fiber contents and prepared with water or leachate. The presence of fibers reduced surface desiccation cracks in the clay liners, and increased cohesion and friction angle. The addition of fibers also enhanced shear strength and unconfined compressive strength in all samples, and increased ductile behavior. However, the existence of fibers led to higher permeability in the samples, especially in leachate-prepared samples containing 1% fibers.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Computer Science, Interdisciplinary Applications
Ming-Qing Peng, Shi-Jin Feng, Hong-Xin Chen, Zhang-Long Chen
Summary: This paper presents a new analytical model for forecasting the one-dimensional transient transport of organic pollutants in a typical landfill composite liner. The model considers the coupling effect of molecular diffusion, thermodiffusion, advection, and linear adsorption processes. The results show that thermodiffusion significantly influences pollutant migration in the composite liner.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Shahin Ghazizadeh, Christopher A. Bareither
Summary: This study evaluated the shear behavior and failure mechanisms of composite systems comprised of a geosynthetic clay liner (GCL) and textured geomembrane (GMX). The peak critical shear strength of GCL/GMX composite systems increased with an increase in GMX spike density. The effect of geotextile type and mass per area more profoundly influenced peak critical shear strength at normal stress > 500 kPa.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)