Article
Environmental Sciences
Zeynep Demiray, Nihat Hakan Akyol, Nadim K. Copty
Summary: This study investigates the elution behavior of pool-dominated dense nonaqueous phase liquid (DNAPL) source zone mass during enhanced solubilization remediation. The experiments showed that the performance of solubilization agents on PCE source zone depletion was in the order of Tween 80 > SDS > MCD > Water. The two modeling approaches used revealed non-ideal behavior and showed that mass removal in later stages is controlled by hard-to-access zones.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Andres E. Prieto-Estrada, Mark A. Widdowson, Lloyd D. Stewart
Summary: In this study, a numerical solute transport model was calibrated using high-resolution monitoring data to analyze a multi-component source of nonaqueous phase liquids (NAPLs) and assess the uncertainty of estimated parameters. The dissolution of NAPL mass was simulated using SEAM3D and parameter zones were adjusted to represent the heterogeneous architecture of the source zone. Through the use of PEST and data-worth analyses, the source zone parameters were estimated and the accuracy of model parameters was improved.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Jofre Herrero, Diana Puigserver, Ivonne Nijenhuis, Kevin Kuntze, Jose M. Carmona
Summary: This study investigated the distribution of microbial communities in two boreholes in the source area of perchloroethene through T-RFLP and clone library analysis. The most abundant phylums found in the sediment were Proteobacteria, Actinobacteria, and Firmicutes. The study demonstrated that environmental factors like fine granulometry, oxygen tolerance, terminal electron-acceptor processes, and toxicity controlled the microbial structure in response to chlorinated solvent contamination.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Xueyuan Kang, Amalia Kokkinaki, Xiaoqing Shi, Hongkyu Yoon, Jonghyun Lee, Peter K. Kitanidis, Jichun Wu
Summary: This study presents a framework that combines a deep-learning-based inversion method with a process-based upscaled model to estimate source zone architecture (SZA) metrics and mass discharge from sparse data. By improving the estimation method, the upscaled model accurately reproduces the concentrations and uncertainties of multistage effluents, providing valuable input for decision making in remediation applications.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Civil
Xueyuan Kang, Amalia Kokkinaki, Christopher Power, Peter K. Kitanidis, Xiaoqing Shi, Limin Duan, Tingxi Liu, Jichun Wu
Summary: The proposed geostatistical data assimilation method, using deep learning techniques, significantly improves the monitoring of DNAPL remediation. Experimental results show a reduction of 51% in the estimation error of DNAPL mass remediation compared to the standard EnKF method, indicating better real-time monitoring of DNAPL remediation.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Geoffrey R. Tick, David R. Slavic, Nihat Hakan Akyol, Yong Zhang
Summary: The presence of multicomponent DNAPL mixtures can greatly limit groundwater remediation. Using specific flushing agents can significantly reduce the time required for contaminant removal, but different flushing agents have different efficiency in terms of various metrics.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Article
Environmental Sciences
Joseph Rossabi, Dennis G. Jackson, Holly H. Vermeulen, Brian B. Looney
Summary: An in situ field study in South Carolina revealed that dense non-aqueous phase liquids can migrate over 650 m in groundwater and persist for more than three decades. This finding advances the understanding of the mechanisms behind the persistence of contaminated plumes.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Engineering, Environmental
Teng Wang, Zi-Xuan He, Jun Yang, Liang Wu, Xia-Wen Qiu, Lian -Jun Bao, Eddy Y. Zeng
Summary: Riverine transport of organic contaminants from e-waste recycling zones to surrounding areas has been found to be significant, with sediment acting as a source of some contaminants. The horizontal transport of organophosphorus flame retardants (OPFRs) was higher than that of polybrominated diphenyl ethers (PBDEs), and the flux of contaminants varied between upstream and downstream sites.
Article
Environmental Sciences
Yali Li, Nairong Guo, Ke Yuan, Baowei Chen, Junjie Wang, Maofeng Hua, Jing Yu, Jingyan Hu, Run Lu, Shichun Zou, Ying Yang
Summary: The study analyzed the variations in distribution, source composition, mass inventory, and burial flux of polycyclic aromatic hydrocarbons (PAHs) in the Pearl River Estuary (PRE) surface sediments from 2011 to 2019 to investigate the impact of anthropogenic activities. The total concentrations of PAHs in 2019 were at a medium level compared to other global bays/estuaries/coastal areas and decreased by about 50% compared to 2011. The dominant source of PAHs shifted from petroleum to traffic emissions, attributed to the transformation of energy source structure in the Pearl River Delta. The decreasing PAH concentration was related to sediment coarsening and decline of total organic carbon. These findings can be applicable to other estuarine environments influenced by human activities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Mona Hoseini Soflaee, Rushendhiran Kesavan, Umakant Sahu, Alpaslan Tasdogan, Elodie Villa, Zied Djabari, Feng Cai, Diem H. Tran, Hieu S. Vu, Eunus S. Ali, Halie Rion, Brendan P. O'Hara, Sherwin Kelekar, James Hughes Hallett, Misty Martin, Thomas P. Mathews, Peng Gao, John M. Asara, Brendan D. Manning, Issam Ben-Sahra, Gerta Hoxhaj
Summary: Purine depletion induces serine synthesis and promotes cancer cell migration and metastasis.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Civil
Jianmin Bian, Dongmei Ruan, Yu Wang, Xiaoqing Sun, Zhiqi Gu
Summary: In this study, a hyperheuristic homotopy algorithm (HH-HA) and a homotopy-based swarm intelligence algorithm were proposed to improve the search ergodicity and stability of deterministic and stochastic inversion approaches for the identification of DNAPL source characteristics and contaminant transport parameters. A Bayesian ensemble machine learning (BEML) method was also proposed for surrogate modeling to enhance learning and reduce computational cost. The verification and application of these inverse modeling methods showed promising results, with significant improvements in accuracy and reliability. The proposed stochastic inversion system is especially important for decision makers as it provides comprehensive reference information.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Multidisciplinary
Umar Farooq, Hassan Waqas, M. Ijaz Khan, Sami Ullah Khan, Yu-Ming Chu, Seifedine Kadry
Summary: The research explores a new approach for heat transfer and biomedicine/bioengineering using nanoparticles in base fluid. Numerical simulations were conducted to examine the heat/mass transportation of nanofluid and bioconvection characteristics under various thermal consequences. The study reveals the effects of different parameters on velocity, temperature distribution, concentration field, and microorganism profile in the nanofluid flow.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Ikram Ullah, Refat Ullah, M. S. Alqarni, Wei-Feng Xia, Taseer Muhammad
Summary: This study investigates the effects of activation energy on nanofluid flow, as well as the influence of heat sources on temperature and concentration.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
W. J. Van den Bergh, H. R. Moran, J. Dirker, C. N. Markides, J. P. Meyer
Summary: The study investigated flow boiling of R-245fa at low mass and heat fluxes. It was found that the heat transfer coefficient was influenced by both mass and heat fluxes, with an increase in mass flux leading to an increase in heat transfer coefficient. Higher vapor quality cases were more sensitive to mass flux, except at low heat flux conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Environmental
Christian Engelmann, Kaveh Sookhak Lari, Luisa Schmidt, Charles J. Werth, Marc Walther
Summary: Laboratory experiments showed significant differences between the pool formation stage and the early DNAPL migration stage, possibly related to more complex processes. Overcoming current limitations in describing DNAPL source zone formation is necessary.
JOURNAL OF HAZARDOUS MATERIALS
(2021)