Review
Environmental Sciences
Sofia L. D'Ambrosio, John A. Harrison
Summary: This article provides a critical review of methods used to estimate the diffusive flux of CH4 from lake sediments, including incubation, benthic chambers, and modeling approaches. The limitations and advantages of each method are discussed, along with published comparisons between different methods. The article also highlights the need for the development and application of new methods to advance understanding of lake CH4 fluxes.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Biodiversity Conservation
Haopeng Guan, Xiaoqiang Chen, Ye Jin, Xiaoting Xie, Huade Zhao, Limin Yu, Lin Lin, Shiguo Xu
Summary: This study investigated the process and mechanism of hypolimnetic hypoxia in a mesotrophic reservoir previously affected by acid mine drainage. The importance of the sulfate reduction process in oxygen depletion was emphasized.
ECOLOGICAL INDICATORS
(2023)
Article
Engineering, Environmental
Chang Liu, Shiyan Wang, Xiaobo Liu, Huaidong Zhou, Budong Li, Yanliang Du, Liang Wang
Summary: This study presents a case study on the impact of hypolimnetic anoxia on water quality in Daheiting Reservoir. The release of total phosphorus in the sediments was found to be a joint effect of biological and chemical processes, with redox reactions in the anoxic zone boosting the release of phosphorus. Anoxia in the reservoir also led to an accumulation of ammonia nitrogen and an increase in the concentration of iron and manganese, which were major driving factors for their release.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Hongbin Yin, Man Zhang, Peng Yin, Jiying Li
Summary: This paper provides a detailed investigation of sediment internal P loading in Lake Taihu and its role in algal dominated zones (ADZs) and grass dominated zones (GDZs). The results show that ADZ sediments have higher levels of total P and mobile P fraction compared to GDZ sediments. The study also identifies ADZ as a hotspot for P, with high concentrations of DGT-measured P. Sediment microbial composition is found to be closely related to different P fractions in the sediment. The findings highlight the importance of considering the sediment composition and different management strategies for combating internal P loading in ADZ and GDZ.
Article
Engineering, Environmental
Nicholas W. Hammond, Francois Birgand, Cayelan C. Carey, Bethany Bookout, Adrienne Breef-Pilz, Madeline E. Schreiber
Summary: The biogeochemical cycles of iron (Fe) and manganese (Mn) in lakes and reservoirs have predictable seasonal trends but less understood short-term trends, which necessitates a closer evaluation. This study successfully predicted Fe and Mn concentrations and trends in a drinking water reservoir using a sensor system. The study also shows that high spatio-temporal resolution predictions of Fe and Mn can improve drinking water monitoring programs and reservoir management practices.
Article
Environmental Sciences
Nan Li, Bin Yang, Tinglin Huang, Fan Si, Yue Gao, Lingyun Zhao
Summary: This study investigates oxygen depletion in both the hypolimnion and sediments in a stratified reservoir, finding that factors such as primary productivity, inflows during rainfall, and oxygen concentrations significantly affect hypolimnetic anoxia. Results show that the areal hypolimnetic oxygen demand (AHOD) and sediment oxygen demand (SOD) vary during summer stratification, with varying contributions from oxygen uptake and flux of reduced substances from sediment layers.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Engineering, Marine
Yu-Hyeon Cho, Ju-Wook Baek, Sung-Uk An, Hyun-Ju Yoo, Hyun-Min Baek, Jin Young Choi, Tae Ha Kim, Kyung-Tae Kim, Jae Seong Lee, Sung-Han Kim
Summary: This study assessed the impact of intensive human activities on organic matter and heavy metal cycles in Shihwa Lake, South Korea. The results showed that the vertical supply of organic matter was a major controlling factor for benthic respiration, and benthic nutrient flux played an important role in primary production. Higher sediment oxygen demand may accelerate the release of certain heavy metals. The benthic fluxes of certain heavy metals were highest near the industrial complex.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Chunhui Yang, Pan Yang, Hongbin Yin
Summary: This study conducted an in situ experiment to control sediment nutrient loading and fluxes in the confluence area using modified zeolite (MZ) in combination with poly aluminum chloride (PAC) and lanthanum-modified bentonite (LMB). The results showed a significant reduction in phosphorus and nitrogen fluxes under the influence of external loading, but efficiency decreased during summertime algal blooming season. The control efficiency varied with different inactivation agents and dosing methods and was largely reduced under the influence of external loading and algal blooms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Qiji Zhang, Tong Liu, Liu Liu, Yifan Fan, Wenxin Rao, Jinglan Zheng, Xin Qian
Summary: Research in China's Taihu Lake and surrounding major rivers found varying levels of microplastic pollution, with inflow rivers more affected than outflow rivers. The main components identified were polyvinyl chloride and polyethylene, with differences in average size and distribution observed in different water bodies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
J. W. Kim, H. K. Ha, S. -B. Woo, M. -S. Kim, H. -K. Kwon
Summary: An in-situ observational study was conducted to investigate the sediment transport processes disturbed by flood generation at the Sihwa tidal power plant. The study found that sediment fluxes were heavily unbalanced during power generation compared to drain, with a significantly higher sediment concentration. The research also suggested a reduction in discharge rate as a possible solution for sediment accumulation in Lake Sihwa, where sediment source was mainly attributed to local resuspension rather than inflow through the gates of the power plant.
Article
Chemistry, Multidisciplinary
Renata Augustyniak-Tunowska, Rafal Karczmarczyk, Michal Lopata, Jolanta Grochowska, Jacek Tunowski, Renata Tandyrak
Summary: Phosphorus is a crucial factor in eutrophication processes, with the majority of it stored in the surficial layers of lake sediment. Understanding the sediment's ability to trap and release phosphorus is important for analyzing a lake ecosystem's function, especially during restoration efforts.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Hongbin Yin, Peng Yin, Zhen Yang
Summary: This study investigated the relationship between sediment internal phosphorus cycling and algal growth in Lake Taihu through a year-long field investigation and laboratory sediment core incubation. The results showed that the release of sediment internal phosphorus in summer increased its concentration and provided nutrients for algal blooms. The laboratory incubation also demonstrated that higher temperatures increased the concentration of internal sediment phosphorus and enhanced its availability to algae.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Wenzhong Tang, Limin Shu, Jack C. Ng, Yaohui Bai, Yu Zhao, Hui Lin, Hong Zhang
Summary: This study analyzed the content characteristics of seven metals (As, Cd, Cr, Cu, Hg, Pb, and Zn) in the surface sediment of Dongting Lake (DTL) and found that the metal fluxes in DTL have shifted from deposition to export, with a weakening effect on sediment quality in recent years.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Martin Merino-Ibarra, Jorge A. Ramirez-Zierold, Patricia M. Valdespino-Castillo, Fermin S. Castillo-Sandoval, Andrea P. Guzman-Arias, Mariel Barjau-Aguilar, Emiliano Monroy-Rios, Luz M. Lopez-Gomez, Arantxa Sacristan-Ramirez, Jose G. Quintanilla-Terminel, Roberto Gonzalez-De Zayas, Jorge Jimenez-Contreras, Maria E. Valeriano-Riveros, Gloria Vilaclara-Fatjo, Salvador Sanchez-Carrillo
Summary: The study highlights the significant impacts of internal waves, boundary mixing, and hypolimnetic warming on nutrient cycling in reservoir lakes. Vertical mixing and associated nutrient fluxes increase notably as the water level decreases, with the potential to increase up to fivefold.
Article
Environmental Sciences
Ben K. Odhiambo, Grace Rihl, Sarah Hood-Recant
Summary: The study analyzed watershed soil losses and sediment accumulation rates in two reservoirs in the Occoquan river basin near Washington, DC, finding variability in sediment accumulation rates and basin soil losses due to differences in land use, basin slopes, and erosion mitigation efforts. Urbanized areas with well-developed storm drain systems showed lower sediment accumulation rates compared to less urbanized areas.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Public, Environmental & Occupational Health
Antti Joonas Koivisto, Michael Jayjock, Kaarle J. Hameri, Markku Kulmala, Patrick Van Sprang, Mingzhou Yu, Brandon E. Boor, Tareq Hussein, Ismo K. Koponen, Jakob Londahl, Lidia Morawska, John C. Little, Susan Arnold
Summary: STOFFENMANAGER (R) and the Advanced REACH Tool (ART) are widely accepted tools for regulatory chemical safety assessment. They are based on a modified multiplicative model, with exposure base levels and exposure modifying factors replaced by different quantities. The models provide qualitative outputs and have shown weak correlation with measured exposure levels, suggesting limitations in their accuracy and performance.
ANNALS OF WORK EXPOSURES AND HEALTH
(2022)
Article
Public, Environmental & Occupational Health
Elaine A. Cohen Hubal, Nicole M. DeLuca, Ashley Mullikin, Rachel Slover, John C. Little, David M. Reif
Summary: This study demonstrates the application of systems science principles in synthesizing holistic insights for decision making using publicly available data and computational tools, focusing on children's environmental health. By studying collective, system-wide interactions, it provides insights into the factors contributing to regional vulnerabilities and interventions that better address complex real-world conditions.
Review
Construction & Building Technology
Wenjuan Wei, John C. Little, Olivier Ramalho, Corinne Mandin
Summary: Chemicals in household cleaning and personal care products can be released into indoor air during and after use, leading to human exposure. In this study, emission models for these products were reviewed, including evaporation, convective mass transfer, and diffusion models.
BUILDING AND ENVIRONMENT
(2022)
Review
Environmental Sciences
Clara M. A. Eichler, Chenyang Bi, Chunyi Wang, John C. Little
Summary: This study identifies high-priority phthalates, phthalate alternatives, and PFAS and explores the availability of model parameters for existing indoor SVOC emission and partitioning models. The results indicate the need for further experimental and modeling work to fully understand the behavior of SVOCs indoors and to predict exposures with more confidence. The study proposes modeling approaches to fill the knowledge gaps and guide future research.
JOURNAL OF EXPOSURE SCIENCE AND ENVIRONMENTAL EPIDEMIOLOGY
(2022)
Article
Limnology
James M. Rand, Mirjam O. Nanko, Mikkel B. Lykkegaard, Danielle Wain, Whitney King, Lee D. Bryant, Alan Hunter
Summary: This analysis demonstrates that manual lake sampling is more likely to occur in fair weather conditions, leading to biased water quality measurements compared to automated monitoring. The study reveals higher water temperatures, higher chlorophyll, and lower dissolved oxygen in manually collected samples, which can be attributed to the weather-induced sampling bias. The findings emphasize the importance of considering and correcting for this bias in climate models and other applications that rely on manually collected water quality data.
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2022)
Article
Green & Sustainable Science & Technology
Maria Amaya, Faye Duchin, Erich Hester, John C. Little
Summary: Economic input-output and watershed models provide valuable insights, but their integration is often limited due to the use of different spatial units. A modular hydrologic-economic modeling framework is designed to address this issue and evaluate the impact of future development prospects on watershed health in Fauquier County.
Article
Environmental Sciences
E. Slavin, D. J. Wain, L. D. Bryant, M. Amani, R. G. Perkins, C. Blenkinsopp, S. Simoncelli, S. Hurley
Summary: Top-down surface mixers are effective in preventing stratification, controlling cyanobacteria, and limiting sediment release of soluble manganese in drinking water reservoirs. However, their limited range of influence leaves a majority of the reservoir exposed to potential issues such as stratification, anoxia, and internal loading of inorganic nutrients and metals.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Wenjuan Wei, John C. Little, Melanie Nicolas, Olivier Ramalho, Corinne Mandin
Summary: The use of liquid products on material surfaces and human skin can result in emissions of chemicals in indoor air. Existing models do not allow for comparison of different scenarios and mechanisms. This study developed a mechanistic model based on mass transfer theories to characterize emissions from liquid products into the air. The model was validated using data on chemical emissions and a sensitivity analysis was conducted. The percentage of emitted chemical mass varied depending on the surface and the peak gas-phase concentration and emission time depended on the properties of the chemical and the surface.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Review
Construction & Building Technology
Chenyang Bi, John C. Little
Summary: Humanity faces complex and systemic societal challenges, where buildings and cities play a significant role. Reliable methods to assess the resilience and sustainability of buildings and cities are needed. However, existing assessment frameworks have limitations in terms of limited causality among component systems, narrow definitions of sustainability and resilience, inadequate attention to social systems, and poor connections between building and urban scales. To address these limitations, a holistic, multi-scale, system-of-systems approach is proposed.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Review
Engineering, Environmental
Bastian Schnabel, Sam Wright, Rees Miller, Lee D. Bryant, Thomas R. Kjeldsen, Roy Maconachie, Solomon P. Gbanie, Kabba S. Bangura, Anthony J. Kamara
Summary: In 2017, 400 million people in Sub-Saharan Africa (SSA) still relied on unimproved drinking water sources, with 80 million using untreated surface water. The expansion of urban areas in SSA has led to challenges in providing clean drinking water. Constructed wetlands (CWs) with phytoremediation offer a cost-effective and sustainable alternative for wastewater treatment. Certain plant species such as Lemna minor, Ipomoea aquatica, Spirodela polyrhiza, and Brachiaria mutica have shown potential to remove heavy metals from surface water.
Article
Water Resources
Hamid Abdolabadi, Maria Amaya, John C. C. Little
Summary: This paper demonstrates the integration of a hydrologic model and an economic input-output model to explore the trade-off between water use and water availability. The approach provides a framework that connects the supply and demand side, allowing for analysis of water allocation and calculation of water scarcity. Furthermore, it takes into account the spatial distribution of economic activity to prevent under or over estimation of water scarcity.
APPLIED WATER SCIENCE
(2023)
Article
Environmental Sciences
Ming Su, Jiao Fang, Zeyu Jia, Yuliang Su, Yiping Zhu, Bin Wu, John C. Little, Jianwei Yu, Min Yang
Summary: Cyanobacteria can adjust their photosynthetic pigments to sense different light colors. Some filamentous cyanobacteria increase their phycoerythrin (PE) levels in green light, leading to extensive odor problems in drinking water reservoirs. This study found a correlation between MIB biosynthesis and chromatic acclimation (CA) induced by ambient light color in a MIB-producing Pseudanabaena strain. Pseudanabaena regulates pigment proportion through CA3, increasing PE and decreasing phycocyanin (PC) in green light. MIB production and chlorophyll a (Chl a) biosynthesis are positively correlated regardless of light color.
ENVIRONMENTAL RESEARCH
(2023)
Review
Engineering, Environmental
John C. Little, Roope O. Kaaronen, Janne I. Hukkinen, Shuhai Xiao, Tatyana Sharpee, Amro M. Farid, Roshanak Nilchiani, C. Michael Barton
Summary: Humans have drastically altered the Earth, leading to complex and systemic challenges such as climate change, renewable energy, infrastructure adaptation, disasters, pandemics, food insecurity, and biodiversity loss in the Anthropocene era. In this Critical Review, we delve into the history of the Universe and Earth, the evolution of life and human societies, and the interconnectedness of geophysical, biophysical, sociocultural, and sociotechnical systems. We propose an evolutionary, system-of-systems, convergence paradigm to address the intertwined societal challenges of the Anthropocene.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Chunyi Wang, Clara M. A. Eichler, Chenyang Bi, Christiaan J. E. Delmaar, Ying Xu, John C. Little
Summary: Assessing exposure to SVOCs emitted from consumer products and building materials in indoor environments is crucial for reducing health risks. Comparing two chamber designs, it was found that the micro chamber required shorter time to reach steady state and the predicted concentration profiles correlated well with existing measurements, demonstrating the direct applicability of chamber data in exposure assessments.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
Article
Water Resources
Maria Amaya, Faye Duchin, Erich Hester, John C. Little
Summary: This study establishes a hydrologic-economic modeling framework to integrate watershed and economic systems, simulating scenarios at different time units to address questions of interest to economists and hydrologists. By examining seasonal increases in nitrogen concentration in response to agricultural intensification, it is found that implementing conjunctive use in irrigation can reduce nitrogen concentration to specified limits in Cedar Run Watershed. The most efficient strategy for conjunctive use varies depending on the timestep utilized in the scenario, expanding the range of questions that can be addressed beyond individual models linked in this framework.
FRONTIERS IN WATER
(2022)
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.
