Article
Environmental Sciences
Evan Lewis, Shreeram Inamdar, Arthur J. Gold, Kelly Addy, Tara L. E. Trammell, Dorothy Merritts, Marc Peipoch, Peter M. Groffman, Johanna Hripto, Melissa Sherman, Jinjun Kan, Robert Walter, Erin Peck
Summary: The study found that dam removals can decrease denitrification rates and soil δN-15 values in riparian zones, but do not significantly affect nitrification processes. Despite high nitrate-N concentrations in surface soil water, nitrate-N leakage was minimal in riparian groundwater where denitrification losses and/or DNRA processes likely occurred. Stream water nitrate-N concentrations were high, but displayed a watershed-wide decline attributed to regional hydrologic changes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Agronomy
Zheyu Xie, Yujing Zhang, Zhenyu Zhang, Jinliang Huang
Summary: A study in Southeast China reveals that the transition zone between rivers and riparian aquifers plays a crucial role in removing nitrate contamination from aquatic systems. The high connectivity between rivers and groundwater enhances the potential for nitrate removal. The study also highlights the significant contributions of manure and sewage, as well as soil and chemical fertilizers, to nitrate contamination.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Engineering, Environmental
Ruihua Li, Mengsha Guan, Wei Wang
Summary: This study demonstrates that pyrrhotite can effectively remove arsenite and nitrate from groundwater, with the PAD technology providing a simple and cost-effective way for remediation. The PSLAD biofilter achieved good removal efficiency under a hydraulic retention time of 6 hours, showing the potential for practical application in addressing co-contaminated groundwater.
Article
Environmental Sciences
Mette Vodder Carstensen, Dominik Zak, Sofie Gyritia Madsen van't Veen, Kamila Wisniewska, Niels Bering Ovesen, Brian Kronvang, Joachim Audet
Summary: Integrated buffer zones (IBZ) are effective in reducing nitrogen loading from agricultural fields to streams by providing a favorable environment for denitrification. However, there is a risk of increasing emissions of greenhouse gases nitrous oxide (N2O) and methane (CH4). The study found that IBZs can efficiently remove nitrogen while also emitting greenhouse gases, but the emissions are comparable to those of natural wetlands and other mitigation measures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Keith E. Schilling, Matthew T. Streeter
Summary: This study presents a paired water table monitoring approach to estimate the reduction of NO3-N loads from tile-drained croplands using saturated buffers. The results show that the saturated buffer can effectively increase the water table height and reduce the N concentration, resulting in a significant reduction in NO3-N loads.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Environmental Sciences
Wanlong Qu, Litao Suo, Ruinan Liu, Manxi Liu, Yanli Zhao, Lu Xia, Yali Fan, Qiufeng Zhang, Zongjun Gao
Summary: Temperature has a significant impact on the efficiency of nitrate removal from groundwater and the structure of microbial communities. The most efficient nitrate removal can be achieved at 40 degrees Celsius.
Article
Environmental Sciences
Yaojin Xiong, Yao Du, Yamin Deng, Teng Ma, Dian Li, Xiaoliang Sun, Guangning Liu, Yanxin Wang
Summary: This study used multiple stable isotopes and spectral characteristics of DOM to investigate the sources and fate of nitrate and ammonium in groundwater in the Central Yangtze River Basin. Different hydrogeological conditions were found to control the behavior of nitrogen compounds in three subareas, leading to contrasting patterns of nitrogen sources and fate.
ENVIRONMENTAL POLLUTION
(2021)
Review
Environmental Sciences
Denis Peach, Adam Taylor
Summary: A dispute over the Silala River between Bolivia and Chile, focusing on the artificial channels in Bolivia and their impact on river and groundwater discharge to Chile, was taken before the International Court of Justice in 2016. To understand the system, Chile developed a numerical groundwater model based on various investigations, including geological mapping, drilling, satellite imagery interpretation, and hydrogeochemical analyses.
WILEY INTERDISCIPLINARY REVIEWS-WATER
(2023)
Review
Environmental Sciences
Amina Richa, Sami Touil, Meriem Fizir
Summary: This review introduces tracking tools for nitrate sources in groundwater and discusses methods for nitrate removal. Possible solutions to overcome the limitations of these methods are also proposed.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
So Yeon Yoon, Min Ji Kim, Hye Won Kim, Seon Hwa Lim, Choe Earn Choong, Sang-Eun Oh, Jung Rae Kim, Yeomin Yoon, Jae young Choi, Eun Ha Choi, Min Jang
Summary: The aim of this study was to investigate the effects of hydrophilic sulfur-modified nanoscale zero-valent iron (S-nZVI) as a biocatalyst for denitrification. The researchers found that the denitrifying bacteria Cupriavidus necator promote Fe corrosion during biocatalytic denitrification, resulting in a higher synergistic factor for S-nZVI compared to nanoscale zero-valent iron. Kinetic profiles showed that the preferred electron acceptor for biocatalytic denitrification using S-nZVI and C. necator was SO42-, and up-flow column experiments demonstrated a high nitrogen removal capacity using S-nZVI for 127 days. Microbiome taxonomic profiling revealed that the addition of S-nZVI promoted the growth of specific microbes that can enhance denitrification.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Chemical
Belen Peroni, Marisa Navas, Hernan P. Bideberripe, Bibiana Barbero, Monica L. Casella, Maria A. Jaworski
Summary: The study investigated the removal of hazardous oxyanions NO3-, NO2-, and BrO3- using novel PdCu/10ZrCe structured catalysts supported on cordierite monoliths. The catalyst showed good activity and selectivity in synthetic water, but lower activity in real water samples due to competition for active sites by different ions. The structured catalyst has potential for developing a system for water remediation based on PdCu/ZrO2-CeO2 materials.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Environmental Sciences
Melissa Sherman, Johanna Hripto, Erin K. Peck, Arthur J. Gold, Marc Peipoch, Paul Imhoff, Shreeram Inamdar
Summary: The study found that milldams have significant impacts on riparian groundwater gradients, flow directions, and mixing regimes, which vary under different hydrological conditions.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Chemical
Masashi Nishida, Syuhei Matsuo, Karin Yamanari, Masayoshi Iwahara, Katsuki Kusakabe
Summary: In this study, it was found that Rhodotorula graminis NBRC0190 immobilized on calcium alginate hydrogel beads can efficiently remove nitrate-nitrogen in simulated groundwater. The denitrification performance of the beads can be maintained even after repeated treatments. When applied to actual groundwater, it can improve water quality.
Article
Engineering, Environmental
YeoJin Ju, Dong-Chan Koh, Dong-Hun Kim, Bernhard Mayer, Hong-il Kwon
Summary: This study investigated a riparian aquifer in South Korea that was experiencing declining groundwater levels and elevated nitrate concentrations due to agricultural activities. The main sources of nitrate contamination were identified as manure and sewage, and denitrification was the dominant removal process. The study also found the presence of denitrification and anammox genes in the microbial communities, supporting effective natural nitrate attenuation. Denitrification reduced nitrate flux into the nearby stream, with most of the generated N2 escaping into the atmosphere.
Article
Environmental Sciences
Ling-Zhi Zhang, Wei He, Fu-Yi Huang, Wei He, Pengpeng Zhou, Cuibai Chen, Christopher Rensing, Kristian Koefoed Brandt, Jiangtao He, Fei Liu, Yi Zhao, Huaming Guo
Summary: This study investigated the microbial community, nitrogen metabolic attributes, and their responses to NO3--N pollution in suburban groundwater in Beijing. The results showed that groundwater with higher NO3--N concentrations had lower microbial richness and abundance of N metabolic genes, and denitrification was the dominant N cycling process. The study also found significant associations between NO3--N, NH4+-N, microbial taxonomy, and N functional attributes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)