Review
Engineering, Chemical
Alexis Ruben Bracamontes-Ruelas, Luis Alberto Ordaz-Diaz, Ana Maria Bailon-Salas, Julio Cesar Rios-Saucedo, Yolanda Reyes-Vidal, Liliana Reynoso-Cuevas
Summary: This article provides an overview of emerging pollutants in wastewater and the environment, discussing their entry pathways and distribution. It also presents advanced oxidation processes and biological treatment methods for removing these pollutants.
Review
Chemistry, Physical
Jorge Rodriguez-Chueca, Jaime Carbajo, Patricia Garcia-Munoz
Summary: In recent decades, UV-AOPs have been used to remove various contaminants from polluted water, but their industrial-scale application is limited by high operational costs. Researchers have been working on increasing their efficiency and reducing costs by optimizing operational parameters, developing photocatalytic materials, and combining different UV-AOPs for pollutant treatment.
Article
Engineering, Environmental
Maria J. Martin de Vidales, Esteban Palomo de la Fuente, Evangelina Atanes-Sanchez, Francisco Fernandez-Martinez
Summary: The aim of this study was to develop a new, highly compact multi-option photo reactor for the removal of emerging contaminants from wastewater. Different advanced oxidation processes, including electrochemical oxidation, photolysis, and photocatalysis with TiO2 nanotubes array, were investigated and combined to create a photoelectrocatalytic oxidation process. The efficiency of these processes was evaluated by measuring the removal of ofloxacin, a pharmaceutical compound used as a model contaminant. SEM and XRD characterization confirmed the formation of anatase-phase nanotubes with suitable dimensions for photocatalytic reactions. The results demonstrated that the coupling of these technologies was effective, leading to high process efficiencies.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Rodrigo Peralta Muniz Moreira, Alejandro Cabrera Reina, Paula Soriano Molina, Jose Antonio Sanchez Perez, Gianluca Li Puma
Summary: In this study, the impact of mixing and hydrodynamics on the removal of contaminants of emerging concern (CECs) in secondary WWTP effluent by the solar photo-Fenton process was investigated using computational fluid dynamics (CFD). The models were validated through experimental mixing time and CECs removal, and it was found that deviations from an ideal CSTR were significant when the CECs half-life/mixing time ratios were <1. The study suggests that careful examination of the hydrodynamics in large-scale RPRs is necessary to reduce power consumption while improving mixing performance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Liang Tang, Aozhou Li, Minghao Kong, Dionysios D. Dionysiou, Xiaodi Duan
Summary: Pollutants of emerging concern in aqueous environments pose a significant threat to the aquatic ecosystem and human health. UV-assisted advanced oxidation/reduction processes have been identified as competent and cost-effective treatment approaches for removing such pollutants. The effectiveness of these processes depends heavily on the wavelength of the UV irradiation used. This article systematically discusses the wavelength dependency of various UV-assisted processes on the transformation of contaminants and emphasizes the importance of matching the wavelengths with the target compounds and oxidants/reductants for optimized pollutant removal and disinfection byproduct control.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Dariusz Kiejza, Urszula Kotowska, Weronika Polinska, Joanna Karpinska
Summary: There has been a growing interest in using advanced oxidation processes for water and wastewater decontamination, with new oxidants such as peracetic acid widely utilized. The degradation of organic compounds involves radicals derived from the activation of peracids, resulting in the formation of products of lower mass, less toxic, and more susceptible to biodegradation. The activation methods and matrix composition have a significant impact on the efficiency of contamination removal using peracids.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Isabel Oller, Sixto Malato
Summary: The application of photo-Fenton technology in wastewater treatment is a popular research topic, especially in countries with water scarcity and abundant sunlight. Heterogeneous photo-Fenton processes working at neutral pH have gained attention, but designing efficient catalysts remains a major challenge.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Environmental Sciences
Reyna Berenice Gonzalez-Gonzalez, Elda A. Flores-Contreras, Roberto Parra-Saldivar, Hafiz M. N. Iqbal
Summary: This review emphasizes the importance of bioremediation techniques for the removal of emerging pollutants. These pollutants are chemical or biological substances that are currently not monitored or regulated, but can have harmful effects on the environment and human health. To achieve sustainable remediation, recent research has focused on advanced biological remediation technologies, such as those involving plants, bacteria, microalgae, and fungi. The review compiles the latest studies to expand our understanding of sustainable remediation technologies and presents research opportunities based on current challenges.
ENVIRONMENTAL RESEARCH
(2022)
Review
Environmental Sciences
Monali Priyadarshini, Indrasis Das, Makarand M. Ghangrekar, Lee Blaney
Summary: Advanced oxidation processes (AOPs) are promising technologies for the treatment of contaminants of emerging concern by utilizing highly reactive radicals. Among the evaluated technologies, modified electrochemical oxidation, gamma radiation, and plasma-assisted systems have shown the greatest potential for successful implementation in wastewater treatment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Review
Engineering, Environmental
Santiago Correa-Sanchez, Gustavo A. Penuela
Summary: An increasing number of emerging pollutants (EPs) have raised concerns due to their potential risks in the environment, and peracetic acid (PAA) based advanced oxidation processes (AOPs) have emerged as a promising alternative. This study critically analyzes the advantages, disadvantages, and opportunities of PAA-based processes, and suggests key perspectives for further research.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Review
Engineering, Environmental
Wei Lun Ang, Patrick J. McHugh, Mark D. Symes
Summary: Sonoelectrochemical pollutant degradation is a promising method for water treatment, which combines both electrochemical and ultrasonic techniques to efficiently convert pollutants into harmless substances. The synergistic effects of electrochemistry and ultrasonication lead to faster degradation rates and improved mass transport, making it an attractive approach for pollutant removal in water.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Engineering, Environmental
Tao Jiang, Bing Wang, Bin Gao, Ning Cheng, Qianwei Feng, Miao Chen, Shengsen Wang
Summary: Biochar has shown great potential in environmental remediation due to its low cost, large specific surface area, porosity, and high conductivity. However, there is still a need to further explore the effects of biochar properties on catalytic performance and fill in the knowledge gaps in the reaction mechanisms of biochar-assisted advanced oxidation processes. Additionally, there is a lack of regeneration methods for biochar catalysts. Therefore, it is necessary to systematically review the latest research progress of biochar-assisted advanced oxidation processes in the treatment of organic pollutants in water.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Chun Zhao, Ying Wang, Xuxu Wang, Dionysios D. Dionysiou
Summary: This article reviews the development of electrophotocatalytic processes (EPPs) for the treatment of contaminants of emerging concern (CECs) and pathogens, explaining the mechanisms and effects of EPPs under UV/visible light. It discusses the active radicals and holes generated during photochemical/photocatalytic processes, operational conditions, oxidation paths, effects of different photoelectrodes, and the combination with other systems for CECs degradation and pathogen inactivation. The main trends in the field, knowledge gap, and recommendations for further developments are highlighted.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Review
Geochemistry & Geophysics
Sebastien Ryskie, Carmen M. Neculita, Eric Rosa, Lucie Coudert, Patrice Couture
Summary: Responsible use and effective treatment of mine water are essential for sustainable mining. Contaminants of emerging concern present new challenges in mine water treatment, with a focus on addressing the specific treatment needs of mine sites operating in cold climates.
Review
Engineering, Environmental
Sunil Paul M. Menacherry, Usha K. Aravind, Charuvila T. Aravindakumar
Summary: Elimination of organic contaminants is crucial for environmental protection. Advanced oxidation processes may generate similar transformation products. Mass spectrometry based investigations are important for understanding the degradation mechanism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Engineering, Chemical
Yusi Li, Elisabeth R. Thomas, Mariana Hernandez Molina, Stewart Mann, W. Shane Walker, Mary Laura Lind, Francois Perreault
Summary: Pervaporation is a membrane desalination process that can handle water with higher total dissolved solids. Poly(vinyl alcohol) (PVA), silica/silicate, graphene oxide (GO), and zeolite are commonly used materials for synthesizing pervaporation desalination membranes. PVA is the most common material with high permeance. The surface free energies of different materials were evaluated to analyze the scaling/fouling propensity of the membranes, indicating that materials with higher hydrophilicity may be beneficial for high-efficiency pervaporation desalination in the future.
Article
Chemistry, Multidisciplinary
Indu Venu Sabaraya, Xintong Li, Francois Perreault, Andrei Dolocan, Jean Anne C. Incorvia, Mary Jo Kirisits, Navid B. B. Saleh
Summary: This study evaluated the transformation and effects of water treatment membranes and transistors enabled with MoS2 in complex landfill conditions. The results showed that MoS2-enabled devices did not undergo major chemical decay in the landfill and the complex environment resisted changes in microbial diversity upon exposure to MoS2. Further studies are needed to assess the potential effects of high concentrations of MoS2 on leachate microbiome.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Engineering, Environmental
Ashton Collins, Mohamed Ateia, Kartik Bhagat, Tsutomu Ohno, Francois Perreault, Onur Apul
Summary: This study analyzed the surface interactions and leachate production of six microplastics under ultraviolet (UV) irradiation. The results showed that UV irradiation caused the release of organic matter from the surface of microplastics, with polystyrene and resin coated polystyrene producing the most leachate. The differences in leachate formation for different polymers were attributed to their chemical makeup and their interaction with UV. These findings suggest that leachate formation is an important source of organic compound influx to natural waters.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Roberto Cestaro, Laetitia Philippe, Albert Serra, Elvira Gomez, Patrik Schmutz
Summary: In this study, electrodeposited manganese oxides (MnyOx) films were used as a visible-light-driven photocatalyst for the removal and mineralization of Tetracycline (TC) antibiotics. The best performing manganese oxide showed 92.4% TC mineralization efficiency after 180 min of LED visible illumination. Hydroxyl radicals (center dot OH) were found to be the main active species responsible for the TC degradation. The degradation of the oxide surface structure was identified as the key factor limiting the photocatalytic activity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Mohamed E. A. Ali, Rayan Alghanayem, Aislinn Varela, Marion Bellier, Francois Perreault
Summary: This study demonstrates the potential of using air microbubbles (MB) for scaling mitigation in membrane distillation (MD) processes. The addition of MB was found to reduce membrane scaling and prevent salt crystal formation on the membrane surface. The effectiveness of scaling mitigation by MB was dependent on the MD operating conditions, with better performance at lower feed temperatures and flow rates. Continuous MB injection was more effective than a periodic on/off MB regime, emphasizing the prevention of scaling rather than dislodging of the scaling layer.
Article
Biochemistry & Molecular Biology
Sergio Garcia-Segura, Javier del Rey, Laia Closa, Iris Garcia-Martinez, Carlos Hobeich, Ana Belen Castel, Francisco Vidal, Jordi Benet, Maria Oliver-Bonet
Summary: Since the first description of a commensal seminal microbiome using sequencing, less than a decade ago, interest in the composition of this microbiome and its relationship with fertility has been growing. Articles using next-generation sequencing techniques agree on the identification of the most abundant bacterial phyla. However, at the genus level, there is still no consensus on which bacteria are most abundant in human seminal plasma.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Applied
Mohamed E. A. Ali, Shimaa Elbakry, Moustafa Aboelfadl, Hosam Shawky, Qilin Li, Francois Perreault
Summary: Membrane distillation (MD) is a promising technique for high water recovery in desalination. In this study, carbon black (CB) was used as a nanophotonic material to enhance MD performance. Different coating procedures were investigated to form a uniform layer of CB particles on PTFE and PVDF membranes. The coated membranes showed increased hydrophilicity and improved permeate flux and salt rejection. The PTFE membrane coated with 0.5% CB exhibited the highest water flux of 14.6 LMH compared to the commercial control with a flux of 8.0 LMH. The results suggested that the CB coating can enhance the performance of MD membranes.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Environmental Sciences
M. Dilara Hatinoglu, Francois Perreault, Onur G. Apul
Summary: Microplastics (MPs) can carry organic pollutants such as per- and polyfluoroalkyl substances (PFAS). Therefore, it is important to understand the adsorptive interactions between MPs and PFAS in natural waters. This study developed a predictive model for the adsorption of PFAS by MPs using a subset of ionizable perfluoroalkyl carboxylic acids (PFCA) and provided insights into the factors affecting their adsorption. The results showed that the polarizability and hydrophobicity of anionic PFCA were the most significant contributors to their adsorption by MPs, while van der Waals interactions between PFCA and water decreased their binding affinity. Overall, the study demonstrated the potential of linear solvation energy relationships (LSER) for predicting the adsorption of ionizable PFAS by MPs after accounting for their ionization.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Omar Alrehaili, Ana S. Fajardo, Sergi Garcia-Segura, Paul Westerhoff
Summary: Innovations in reactor geometry can lower energy requirements for electrolysis and degrade environmental pollutants. Microfluidic devices with high electrode surface area to solution volume ratios minimize mass transfer limitations and decrease energy requirements.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Engineering, Environmental
Gamze Ersan, Gabriel Antonio Cerron-Calle, Mahmut S. Ersan, Sergi Garcia-Segura
Summary: Adsorptive separation technologies are effective in removing organic contaminants from aqueous water. The breakthrough of contaminants pose a challenge in regeneration of spent adsorbents. Electrochemically induced regeneration has the potential to overcome these challenges and provide a sustainable solution. This review critically evaluates the fundamental aspects of in situ electro-regeneration for spent carbons and discusses specific examples related to emerging contaminants.
Article
Chemistry, Multidisciplinary
Elvira Gomez, Arnau Fons, Roberto Cestaro, Albert Serra
Summary: In this study, efficient heterogeneous catalysts with multiple active sites were successfully synthesized for the activation of peroxymonosulfate (PMS) to degrade persistent organic pollutants. The CoNi-based catalysts, fabricated through a cost-effective and eco-friendly process, demonstrated exceptional efficiency in the degradation and mineralization of tetracycline. The effects of various factors on the degradation and mineralization processes were also investigated.
Article
Environmental Sciences
Gabriel Antonio Cerron-Calle, Ana S. Fajardo, Jingyue Liu, Carlos M. Sanchez-Sanchez, Sergi Garcia-Segura
Summary: Fertilizers are crucial in the food-energy-water nexus. The electrocatalytic nitrate reduction for ammonia production is a promising alternative to centralized processes. However, the challenge lies in finding affordable and selective electrocatalysts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Ana S. Fajardo, Paul Westerhoff, Sergi Garcia-Segura, Carlos M. Sanchez-Sanchez
Summary: This article discusses how electrolyte engineering can control the selectivity and kinetics of electrochemical reduction of nitrate (ERN). The presence of different alkali cations in the solution has a significant impact on the removal rate of nitrate and the product selectivity. By tuning the electrode-electrolyte interface with suitable cations, a significant shift in product selectivity from Ngas to ammonia production can be achieved. Additionally, solutions containing Cs+ show a approximately 2-fold decrease in electrical energy per order compared to solutions containing Li+.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Andre L. Magdaleno, Gabriel A. Cerron-Calle, Alexsandro J. dos Santos, Marcos R. V. Lanza, Onur G. Apul, Sergi Garcia-Segura
Summary: This study proposes the use of oxygen nanobubbles to enhance the gas efficiency of electrogeneration of H2O2, and finds that nanobubbles have a higher gas-liquid mass transfer coefficient compared to macrobubbles. Additionally, the reaction yield of electrogeneration of H2O2 is improved under the influence of nanobubbles.
Article
Engineering, Chemical
Raul Jose Alves Felisardo, Enric Brillas, Eliane Bezerra Cavalcanti, Sergi Garcia-Segura
Summary: This study reports the remediation of CIP in synthetic urine using electrochemical oxidation with a boron-doped diamond (BDD) anode. The results show that the ECO process with a BDD anode generates hydroxyl radicals and free chlorine as effective oxidants for CIP removal. Uric acid is completely oxidized, while urea and creatinine are partially destroyed. The TOC reduction rate is moderate under specific pH and current density conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(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.
