Article
Engineering, Environmental
Shuangjie Xiao, Zilan Jin, Haoran Dong, Junyang Xiao, Yangju Li, Long Li, Rui Li, Jie Chen, Ran Tian, Qianqian Xie
Summary: This study investigated the influence of sulfur reagents and sulfidation sequence on the properties and performance of S-nZVI in simulated groundwater. The results showed that co-sulfidized S-nZVI had higher reactivity but lost it more rapidly during aging compared to post-sulfidized S-nZVI. S-nZVIpost exhibited superior long-term performance with a degradation rate of trichloroethylene (TCE) remaining at 30%-60% after 90 days of aging. The sulfur precursors affected the selectivity of S-nZVI, but not the degradation pathway of TCE.
Article
Engineering, Environmental
Xin Yin, Han Hua, James Dyer, Richard Landis, Donna Fennell, Lisa Axe
Summary: Reactive iron mineral coatings in subsurface RTZs contribute to contaminant attenuation. An 18.3-m anoxic core was collected, and reactive Fe mineral coatings were found to be abundant. Reaction kinetics with RTZ sediments showed pseudo-first-order reactions for the three contaminants, with degradation of 90% achieved in less than 39 days. The high reactivity of Fe mineral coatings is hypothesized to be due to the large surface areas of the nano-mineral coatings.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Geosciences, Multidisciplinary
Nikolas Benavides Hoglund, Charlotte Sparrenbom, Rui Hugman
Summary: Polluted groundwater discharge from a contaminated site in Hagfors, Sweden is affecting a nearby sparsely populated stream. To address the difficulties in remediating the source zone, decision makers have changed the site management objective to mitigating the discharge. A groundwater numerical decision-support model was developed to help formulate targeted remediation strategies. The model incorporates historical data and measurements of surface water chemistry to estimate the flux and distribution of contaminated groundwater discharge.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Chemical
Sunhwa Park, Deok Hyun Kim, JongHyun Yoon, JongBeom Kwon, Hyojung Choi, Ki-In Kim, Kyungjin Han, Moonsu Kim, Sun-Kyoung Shin, Hyun-Koo Kim
Summary: This study monitored the distribution of several chlorinated compounds in groundwater in South Korea, including PCE, TCE, cis-DCE, and VC. Statistical analysis revealed correlations between these compounds and dissolved oxygen, oxidation-reduction potential, electrical conductivity, and sulfate concentration in certain wells, indicating suitable conditions for biological dechlorination. Furthermore, the study evaluated the non-carcinogenic and carcinogenic risks of cis-DCE and VC, with cis-DCE posing a non-carcinogenic risk and VC having a high carcinogenic risk.
MEMBRANE AND WATER TREATMENT
(2022)
Article
Chemistry, Physical
Conaill F. Perry, Inga Jordan, Pengju Zhang, Aaron von Conta, Fernanda B. Nunes, Hans Jakob Woerner
Summary: The study reveals that the vertical ionization energies and peak widths of the outer-valence bands of liquid water decrease with increasing photon energy close to the ionization threshold. These effects are not only dependent on the electron kinetic energy, but also vary for different outer-valence bands.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Environmental
Juliana Levi, Sujin Guo, Shalinee Kavadiya, Yihao Luo, Chung-Seop Lee, Hunter P. Jacobs, Zachary Holman, Michael S. Wong, Sergi Garcia-Segura, Chen Zhou, Bruce E. Rittmann, Paul Westerhoff
Summary: This study compared four different methods for reducing nitrate in water and selected the most effective one. The results showed that the method of delivering Pd/In nanoparticles directly to the catalyst-film through gas-permeable hollow-fiber membranes had the least palladium loss and remained active over multiple operational cycles.
Article
Green & Sustainable Science & Technology
Bing Yang, Hui Li, Yang Sun, Hengji Zhang, Jiawen Liu, Jie Yang, Xue Zhang
Summary: Thermal oxidation, ultraviolet radiation, and water all have significant impacts on asphalt pavement aging, which in turn leads to more serious emissions into aqueous environments. This study used four aging methods to conduct comprehensive aging tests on asphalt binders, evaluating their rheological, chemical, adhesive, surface evolution properties, as well as their environmental impact. The results showed that the aging degree increased under all four aging methods, resulting in increased modulus, decreased phase angle, higher presence of oxygenated chemicals and asphaltenes, and increased water sensitivity. Thermal oxidation and ultraviolet radiation had the most significant acceleration effect on aging. Water, while weakening the aging acceleration effect of UV radiation, led to crack propagation, rougher surface, and increased damage to the asphalt binder. Additionally, the biotoxicity of the leaching solution from aged asphalt was found to decrease significantly with decreasing concentration.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Mohammad A. Moghaddam, Ty P. A. Ferre, Xingyuan Chen, Kewei Chen, Xuehang Song, Glenn Hammond
Summary: Temperature-based methods are widely used in hydrologic science to infer exchange flux, but they have limitations due to simplifying assumptions. Researchers conducted experiments to investigate the application and limitations of machine learning in inferring exchange flux, finding that machine learning methods need to perform well under perfect conditions before considering real data usage.
Article
Green & Sustainable Science & Technology
Ryusei Hashimoto, Shinobu Kazama, Takashi Hashimoto, Kumiko Oguma, Satoshi Takizawa
Summary: This study aimed to establish planning methods for conjunctive use of urban water resources in Yangon City, Myanmar. Through methods like vibration loggers and water mass balance, it was found that the actual groundwater consumption in Yangon City is much higher than the planned data, posing a risk of land subsidence. The study suggests immediate regulation of industrial water to minimize the risk of land subsidence.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Biochemistry & Molecular Biology
Benjamin R. Dexter, Rachel King, Alfio V. Parisi, Simone L. Harrison, Damien P. Igoe, Nathan J. Downs
Summary: This study compared personal sunlight exposure monitored electronically with self-reporting methods in suburban Australia, finding significant differences in exposure duration between electronic monitoring and self-reporting. The research also showed that exposure timing on weekends was earlier than on weekdays, with longer exposure durations on weekends compared to weekdays.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2021)
Review
Environmental Sciences
Yi He, Jingyu Liu, Yanhua Duan, Xiaofei Yuan, Lulu Ma, Ratan Dhar, Yan Zheng
Summary: Approximately 94 to 220 million people worldwide are at risk of drinking well water containing arsenic > 10 pg/L, the WHO guideline value. To identify non-compliant domestic wells, assess health risks and reduce exposure, accurate and rapid on-site inorganic arsenic screening methods are desirable because all domestic wells worldwide need to be tested.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Georg T. Wondrak, Jana Jandova, Spencer J. Williams, Dominik Schenten
Summary: The study demonstrates that full spectrum solar-simulated ultraviolet light can inhibit the infectivity of HCoV-NL63 and SARS-CoV-2 coronaviruses at environmentally relevant doses, providing potential for viral inactivation on a global scale.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2021)
Article
Environmental Sciences
Amy Zhu, Johnny Stone
Summary: This study examines the impact of simulated outer space conditions on the tardigrade species, finding that Kevlar and polyethylene can reduce the effects of nonionizing radiation. The research also suggests the need for future studies to consider additional environmental factors.
Article
Engineering, Environmental
Raul Carrey, Elisenda Balleste, Anicet R. Blanch, Francisco Lucena, Pere Pons, Juan Manuel Lopez, Marina Rull, Joan Sola, Nuria Micola, Josep Fraile, Teresa Garrido, Antoni Munne, Albert Soler, Neus Otero
Summary: This study investigated the identification of nitrate sources using multi-isotopic analysis combined with fecal indicator bacteria and microbial source tracking techniques. The results showed that isotopes and MST analyses were complementary, providing more reliable information on the source of nitrate contamination, particularly useful for tracing nitrate pollution in surface water.
Article
Engineering, Civil
Mahmood Sadat-Noori, Christian Anibas, Martin S. Andersen, William Glamore
Summary: Subsurface flow is crucial for wetland functioning and ecosystem services, with various methods such as radon, heat, and Darcy's equation used to quantify flow rates. While radon provides total subsurface flow, other methods like head gradient and heat tracer may underestimate flow in dynamic coastal systems like tidal wetlands. Employing a multi-tracer approach is important for accurately quantifying hydrological export of dissolved constituents in coastal wetlands.
JOURNAL OF HYDROLOGY
(2021)
