Review
Engineering, Civil
Dana A. Lapides, Bryan M. Maitland, Samuel C. Zipper, Alexander W. Latzka, Aaron Pruitt, Rachel Greve
Summary: Groundwater use can have significant impacts on streamflow and aquatic ecosystems, requiring integrated management strategies. This review evaluates the opportunities and challenges of applying the environmental flows approach to managing streamflow depletion, highlighting the importance of considering temperature and addressing tensions between existing groundwater withdrawal management and environmental flows approaches.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Gerardo Castellanos-Osorio, Adrian Lopez-Ballesteros, Julio Perez-Sanchez, Javier Senent-Aparicio
Summary: The Water Framework Directive requires EU countries to ensure the ecological integrity of freshwater ecosystems. Generating daily flow data in highly water-regulated countries like Spain is challenging, but hydrological models can be used. This study evaluated different approaches for obtaining daily flows to estimate environmental flows in two river basins in Spain. The results showed that one approach outperformed the others in terms of statistical performance and accurately characterizing the natural regime and basic flow values.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
C. Alvarez-Garreton, J. P. Boisier, M. Billi, I. Lefort, R. Marinao, P. Barria
Summary: In this study, a new approach to diagnose water allocation scheme compatibility with long-term water security is proposed. The researchers argue that when the remaining flow of a river after upstream withdrawals is not sufficient to safeguard ecological river functions, it indicates failing water management. The water scarcity risks and safeguarded environmental flows (e-flows) in 277 basins in Chile were analyzed to test this hypothesis. The results reveal that the link between e-flows, water allocation, and water security has not been adequately incorporated in the current law. Rating: 9/10.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Nanoscience & Nanotechnology
Salma Abubakar, Tina Skorjanc, Dinesh Shetty, Ali Trabolsi
Summary: Calixarene-based polymers have emerged as efficient adsorbents for a variety of compounds and ions, with potential applications in environmental remediation. The synthetic methods include Sonogashira-Hagihara coupling, and diazo and imine bond formation. These materials show promising applications in adsorbing dyes, micropollutants, heavy metals, and other pollutants from water.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Environmental Sciences
Numair Masud, Alice Davies-Jones, Ben Griffin, Jo Cable
Summary: Chemical pollutants, such as microplastics and Roundup herbicide, play a significant role in the degradation of freshwater habitats and species loss. This study revealed that microplastics increased mortality in uninfected fish, while Roundup decreased mortality in uninfected fish. However, the combined effect of microplastics and Roundup greatly increased mortality in uninfected fish. For infected fish, the combined effect of microplastics and Roundup increased mortality, while microplastics alone did not significantly affect mortality and Roundup alone increased mortality. Additionally, microplastic consumption resulted in longer infection duration in fish, while Roundup significantly reduced pathogen burdens.
Article
Engineering, Chemical
Pramod M. Gurave, Bhanu Nandan, Rajiv K. Srivastava
Summary: Inspired by fish gills, superhydrophilic nanofibrous membranes decorated with ZIF-8 have been developed for efficient separation of oil/water emulsions and removal of heavy metal ions. The multifunctional membranes can be tailored by controlling the growth process of ZIF-8. This study demonstrates the potential applications of these membranes in pollution treatment.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Environmental Sciences
Rupesh Patil, Yongping Wei, David Pullar, James Shulmeister
Summary: This study analyzed the sensitivity of streamflow patterns to flow regulation and climate change in the Goulburn-Broken catchment in Victoria, Australia. Low and medium flows increased by 26%, while high and overbank flows decreased by 31% during the period between 1977 and 2018. The timing of flow metrics would be dominated by variation in rainfall, while current river regulation and flow diversion practices would dominate future change in magnitude, duration, and frequency of the streamflow.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Multidisciplinary Sciences
Szilard Erhart, Kornel Erhart
Summary: We develop a methodology to assess the integrated toxicity and climate change risk of European facilities, industries, and regions. Using the European Pollutant Release and Transfer Register, we measure key indicators of Sustainable Development Goals, such as human toxicity, ecotoxicity, and global warming impact potentials from pollutant releases of over 10,000 companies and 33,000 facilities between 2001 and 2017. Our findings reveal that the electricity production sector has the largest impact on human toxicity (46% of total) and global warming potential (50%), while the sewerage sector has the largest ecotoxicity impact potential (50%). We argue that carbon footprint should only be used as a climate change risk indicator, not an overall environmental performance indicator. Overall, we rate this study as 8 out of 10.
SCIENTIFIC REPORTS
(2023)
Review
Green & Sustainable Science & Technology
Jinxiu Wang, Yang Liu, Yecheng Ma, Xinyue Wang, Binglin Zhang, Gaosen Zhang, Ali Bahadur, Tuo Chen, Guangxiu Liu, Wei Zhang, Yidan Zhao
Summary: Halophilic and halotolerant microorganisms have unique structures, physiologies, and genomes that enable them to survive in high salt environments. They play crucial roles in plant stress tolerance, organic pollutant degradation, cultural heritage conservation, and resistance gene spread.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Biology
Mathis L. Messager, Julian D. Olden, Jonathan D. Tonkin, Rachel Stubbington, Jane S. Rogosch, Michelle H. Busch, Chelsea J. Little, Annika W. Walters, Carla L. Atkinson, Margaret Shanafield, Songyan Yu, Kate S. Boersma, David A. Lytle, Richard H. Walker, Ryan M. Burrows, Thibault Datry
Summary: Accelerating the design and implementation of environmental flows (e-flows) is crucial for preserving freshwater biodiversity and its benefits. However, the current focus on ensuring adequate flow conditions at local sites overlooks the role of other ecological processes, hindering the effectiveness of e-flow programs. In this study, a step-by-step operational framework is proposed to address this gap and improve e-flow outcomes by considering metasystem dynamics.
Article
Environmental Sciences
Sergio A. Salinas-Rodriguez, Nick C. van de Giesen, Michael E. McClain
Summary: This study evaluates flow variability contributions in 40 rivers in Mexico and calculates eflow reference values for water allocation under different management objectives. The results show significant differences in flow variability between hydrological conditions and streamflow types, and the new frequency of occurrence provides climate-smart reference values.
Article
Environmental Sciences
Forrest Gage Pilone, Pablo A. Garcia-Chevesich, John E. McCray
Summary: Urban drool, a significant source of urban surface water pollution, consists of year-round flows in urban channels, natural streams, and storm-sewer systems. Most contaminants were found to originate from shallow groundwater, with anthropogenic effects exacerbating groundwater pollutant concentrations. Escherichia coli was found to be a ubiquitous contaminant in all urban waterways.
Article
Environmental Sciences
Arik Tashie, Tamlin Pavelsky, Mukesh Kumar
Summary: Groundwater modules are crucial for simulating low flows in land surface models and rainfall-runoff models. The GrUB module, developed in this study, is based on physically based properties and can be applied without calibration. The performance of GrUB was assessed in 84 watersheds in the US and compared with a calibrated groundwater module. The results show that GrUB generates equivalent or superior error metrics and is robust to changes in the hydrologic model.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Shan He, Hongrui Liu, Enze Zhang, Ting Gao
Summary: Environmental flows management is crucial in reservoir operation, with newer approaches like multicomponent e-flow management providing better flow regimes. In addition to e-flow strategies, reservoir capacity, inflow, and water supply also influence flow regimes. Increasing reservoir inflows decrease flow regime alteration, while increasing water supply quantity has the opposite effect. Certain values of reservoir capacity, inflow sequence, or water supply may result in similar outcomes to simple fixed minimum flows approach.
RIVER RESEARCH AND APPLICATIONS
(2021)
Article
Mechanics
T. Coratger, G. Farag, S. Zhao, P. Boivin, P. Sagaut
Summary: The study evaluates the HRR-P LBM method for simulating complex transonic flows, solving mass and momentum conservation equations as well as the entropy equation for stability, accuracy, and computational cost. The method efficiently handles wall and open boundaries with grid refinement and includes a Vreman subgrid turbulence model for unresolved scales. The validity of the method for transonic applications is confirmed through test cases of increasing complexity.
Article
Engineering, Environmental
Rui Pang, Nan Li, Zhihao Hou, Junjie Huang, Cuixia Yue, Yongxin Cai, Jinxi Song
Summary: This research investigated the oxidation of sulfonamides (SAs) by chlorine dioxide (ClO2) and found that ClO2 has the potential to serve as a chemical oxidant for removing sulfonamides in practical water treatment conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Qiong Wu, Jinxi Song, Haotian Sun, Peng Huang, Kexing Jing, Wenjin Xu, Huiyuan Wang, Dong Liang
Summary: This study examines the characteristics of water conservation function in the Heihe River Basin in China, including its variance on different time scales, spatiotemporal dynamics, and ecosystem variance. The study finds that water conservation function exhibits significant variability, with important regions located mainly in the upstream and central areas of the midstream. The forest ecosystem is found to have the highest resilience and ecological significance, although it is also affected by precipitation deficits and human activities.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Civil
Yuna Shi, Jinxi Song, Junlong Zhang, Peng Huang, Haotian Sun, Qiong Wu, Lei Cheng, Jiaxiong Zhang, Lutong Xing, Shixuan Lyu, Yuyu Zhai
Summary: This study analyzed the responses of streamflow and baseflow in the Bahe River to climate change and human activities. The results showed a declining trend in hydrometeorological variables in the river basin. Precipitation had a stronger correlation with streamflow compared to baseflow. Human activities mainly affected upstream streamflow, while climate change had a greater impact on midstream baseflow. These findings contribute to our understanding of the response mechanisms of the hydrological cycle in a changing environment.
JOURNAL OF HYDROLOGY
(2023)
Article
Ecology
Matthew J. Balzer, James N. Hitchcock, Wade L. Hadwen, Tsuyoshi Kobayashi, Douglas P. Westhorpe, Craig Boys, Simon M. Mitrovic
Summary: There is ongoing debate about the importance of allochthonous dissolved organic matter (DOM) during large flow events in riverine food webs. A mesocosm experiment was conducted to examine the effects of floodplain DOM on the lower food web in an Australian lowland river. The results showed that the addition of tDOM led to increases in zooplankton and mixotrophic algae, and mixotrophs played a significant role in driving changes in primary consumer growth and supporting secondary production.
FRESHWATER BIOLOGY
(2023)
Article
Engineering, Civil
Wenfang Cao, Junguo Liu, Serena Ceola, Ganquan Mao, Mark G. Macklin, Alberto Montanari, Philippe Ciais, Yuanzhi Yao, Paolo Tarolli
Summary: This study reveals the relationship between human settlements and rivers and landforms in China's history. The results show that people in lowland areas have less reliance on rivers, possibly due to higher flood risks, and they rely more on alluvial aquifers distant from rivers for agriculture. Conversely, people in mountainous areas have a stronger reliance on rivers. These findings have important implications for sustainable lifeways in riverine environments.
JOURNAL OF HYDROLOGY
(2023)
Article
Agronomy
Yufei Yao, Fangwang Tang, Chengcheng Wang, Xiaorong Wei, Jinxi Song
Summary: This study investigated the microbial activity and resource limitation in soils of cropland, revegetated forest, and grassland in the hilly-gully region of the Loess Plateau, China. It was found that the microbial community in the revegetated forest was relatively carbon-limited compared to cropland, while phosphorus was the primary limiting factor in the revegetated forest at upslopes, and nitrogen was the limiting factor in the revegetated grassland and cropland. However, land-use change had no significant impact on microbial nitrogen/phosphorus limitations in the check dams.
Article
Ecology
Muhammad Sajid Mehmood, Adnanul Rehman, Muhammad Sajjad, Jinxi Song, Zeeshan Zafar, Zhai Shiyan, Qin Yaochen
Summary: Urbanization puts pressure on green areas and leads to increased land surface temperature and urban heat island effect. This study evaluates the associations between land use land cover changes and land surface temperature in Dera Ghazi Khan, Pakistan, using multi-temporal Landsat data and machine learning methods. The results show significant changes in land use land cover, with strong positive correlation between urbanization and vegetation removal. Without appropriate measures, the city could face a 5 degrees C increase in mean temperature by 2032, leading to more challenges associated with urban heat island. The study is important for urban resource management and sustainable development policies.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Qi Li, Qian Zhao, Jiahua Guo, Xi Li, Jinxi Song
Summary: With the widespread use of diethylstilbestrol (DES), it has become a common contaminant in the aquatic environment. It is toxic to a wide range of aquatic organisms, disrupting the water flea growth and further interfering with several ecosystem services. Nevertheless, the molecular mechanism of DES in water fleas is still unexplicit. In this study, the 21-day chronic test showed that a negative effect of growth and reproduction can be observed with DES exposure. Transcriptomic analysis revealed that exposure to DES significantly affects energy metabolism, lipid metabolism, the digestive system, transport, and catabolism pathways in D. magna, leading to reduced body length and delayed first spawning time. Therefore, this study emphasizes the threat of DES to D. magna and provides insights into its molecular mechanism.
Article
Engineering, Environmental
Xu Zhao, Siyu Hou, Xinxin Zhang, Klaus Hubacek, Martin R. Tillotson, Yu Liu, Junguo Liu
Summary: Applying the planetary boundary for the freshwater framework at the regional level is crucial for supporting local water management, but there is significant uncertainty involved. This study estimates regional freshwater boundaries with reduced uncertainty and explores the potential of different trade patterns in mitigating boundary exceedance. The findings indicate that the current trade pattern in China's provinces limits the effectiveness of trade in alleviating regional freshwater boundary exceedance, and relying solely on increased imports will not reverse the exceedance in most importing provinces.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Shuyu Zhang, Thian Yew Gan, Andrew B. G. Bush, Junguo Liu, Olga Zolina, Alexander Gelfan
Summary: The Arctic rivers contribute significantly to the freshwater streamflow into the Arctic Ocean and are essential for the heat and mass circulation in the Arctic atmosphere and ocean system. This study analyzed the streamflow of the three largest Siberian rivers, showing increasing trends in annual streamflow but decreasing trends in summer and increasing trends in winter for sub-basins. The study also found correlations between streamflow and climate patterns like ENSO, NP, AO, and PNA, providing new insights into the hydrological changes in the region.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Engineering, Civil
Jinxi Song, Dong Liang
Summary: This study compared eDNA metabarcoding technology with conventional microscopical approaches to identify the variability characteristics of the Weihe River community structure under changing environment. The molecular method identified three times more species than the traditional method, significantly improving species identification ability. Molecular methods elucidated the interaction between eco-hydrological variables and zooplankton community structure. Our research provides meaningful demonstrations on the application of eDNA technology in river ecosystem monitoring and assessment.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Yaru Zhang, Yi He, Jinxi Song
Summary: This study assesses the impacts of climate change and land use changes on runoff in the Huangfuchuan Basin. The results show that land use changes have the highest contribution to runoff, followed by climate change. Future climate change scenarios may lead to an increase in runoff. This study provides a valuable foundation for water resource management and conservation on the Loess Plateau.
JOURNAL OF HYDROLOGY
(2023)
Article
Ecology
Lauren O'Brien, Nachshon Siboni, Justin R. Seymour, Matthew Balzer, Simon Mitrovic
Summary: Inflows from unregulated tributaries have a significant impact on microbial community structure and function in regulated rivers. This study investigated the effects of tributary inflows on bacterial community composition and bacterial carbon production (BCP) in the Lachlan River of eastern Australia. The results showed that increased inflows led to a more diverse bacterial community in the regulated mainstem, with a shift towards bacterial groups that prefer humic substances and a decrease in a group that metabolizes algal exudates. Orthophosphate and river discharge were identified as major drivers for the community change. BCP initially decreased with tributary inflows, but increased significantly due to increased water volume. Dissolved organic carbon, water temperature, and conductivity were the key factors driving BCP. Notably, BCP was not influenced by bacterial diversity or community composition. These findings highlight the importance of tributary inflows in shaping the bacterial community and carbon assimilation in riverine ecosystems.
Article
Biochemistry & Molecular Biology
Sercan Pravadali-Cekic, Aleksandar Vojvodic, Jake P. Violi, Simon M. Mitrovic, Kenneth J. Rodgers, David P. Bishop
Summary: This study presents a newly developed and validated method for the detection and quantification of BMAA, its isomers, and major MCs using RP LC-MS/MS. The application of this method on a culture of Microcystis aeruginosa resulted in the simultaneous detection of 2,4-DAB and MC-YR. The study provides a unified method for the quantitative analysis of these cyanotoxins in natural environmental samples.
Article
Environmental Sciences
Liangang Xiao, Mingkai Leng, Philip Greenwood, Rongqin Zhao, Zhixiang Xie, Zengtao You, Junguo Liu
Summary: This study investigates the effects of grazing exclusion on soil organic carbon (SOC) accumulation and vegetation recovery. It finds that grazing exclusion can increase the potential for SOC accumulation, and higher annual precipitation is positively correlated with SOC accumulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.
