Article
Environmental Sciences
Yangyang Liu, Haiping Yuan, Nanwen Zhu
Summary: Autothermal thermophilic aerobic digestion (ATAD) is a rapid and efficient technology for sludge stabilization. By employing thermal hydrolysis pretreatment before ATAD, the digestion efficiency and stabilization time of high solid sludge can be improved. The pretreatment increases the release and hydrolysis of intracellular organics and enhances solubilization. Decreased sludge viscosity and improved fluidity after pretreatment facilitate mixing, aeration, and organics degradation during ATAD.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Energy & Fuels
Pawel Biedka
Summary: The study presents research results on the rejected water from dewatering sludge in ATAD technology. The study was conducted in three municipal WWTPs, with different capacities and sludge node capacities. The rejected water samples had varying levels of nitrogen, phosphorus, organic matter, and oxygen demand. The study also determined the kinetics of organic matter decomposition and assessed its biodegradability.
Review
Environmental Sciences
Min Zhang, Yukihiro Tashiro, Natsumi Ishida, Kenji Sakai
Summary: The article reviews the digestion systems, applications, and characteristics of Autothermal Thermophilic Aerobic Digestion (ATAD) and compares its performance with other biological processes. It also discusses the physicochemical properties and factors of ATAD, as well as the challenges, opportunities, and prospects for its application.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yangyang Liu, Haiping Yuan, Nanwen Zhu, Zhihang Yuan
Summary: Thermal hydrolysis pretreatment (THP) can improve the efficiency of autothermal thermophilic aerobic digestion (ATAD) by alleviating the issues caused by increased solid content. This study investigated the influence of THP on the stabilization of sludge with different solid contents during ATAD. The results showed that stabilization was achieved with VS removal of 39.0%-40.4% after 7-9 days of ATAD for sludge with solid content of 5.24%-17.14%, and the solubilization reached 40.1%-45.0% after THP.
ENVIRONMENTAL RESEARCH
(2023)
Article
Biology
Arivalagan Pugazhendhi, Sridevi Dhanarani Theivaraj, Gowri Manogari Boovaragamoorthy, Veerasamy Veeramani, Kathirvel Brindhadevi, Naif Abdullah Al-Dhabi, Mariadhas Valan Arasu, Thamaraiselvi Kaliannan
Summary: The study aimed to investigate the impact of ATAD on TC residues in digested poultry litter, showing degradation of TC during ATAD digestion process. Analysis using TLC and HPLC confirmed the degradation of TC in digested poultry litter due to abiotic processes.
SAUDI JOURNAL OF BIOLOGICAL SCIENCES
(2021)
Article
Microbiology
Natsumi Ishida, Yoshihisa Kawano, Ryo Fukui, Min Zhang, Yukihiro Tashiro, Kenji Sakai
Summary: Metagenomic analysis was conducted to investigate the microbial dynamics and functional genes in the autothermal thermophilic aerobic digestion (ATAD) process of human excreta, which consists of initial, middle, and final phases. Four gene categories showed changes in abundance during the digestion process. The unusual stable accumulation of ammonia and prompt consumption of short-chain fatty acids could be explained by the presence or absence of related metabolic genes. Besides revealing the relationships between bacteria and physicochemical properties, this research may contribute to improving wastewater management systems worldwide through the use of ATAD process in liquid fertilizer production.
MICROBIOLOGY SPECTRUM
(2022)
Article
Engineering, Environmental
Eskandar Poorasgari, Banu Ormeci
Summary: Experimental and computational approaches were used to model the kinetics of volatile solids destruction during wastewater sludge digestion, taking into account the effects of water evaporation. New kinetic models were developed to predict volatile solids concentrations in different conditions. The study found that water evaporation is an important factor to consider for accurate determination of kinetic rate constants and solids reduction.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Zhiyao Wang, Min Zheng, Haoran Duan, Gaofeng Ni, Wenbo Yu, Yanchen Liu, Zhiguo Yuan, Shihu Hu
Summary: The study demonstrates that aerobic digestion treatment under acidic conditions using the special ammonia-oxidizing bacterium 'Candidatus Nitrosoglobus' can significantly reduce the volume and improve the quality of anaerobically-digested sludge. The acidic aerobic digestion was found to effectively stabilize AD sludge and meet USEPA Class A biosolids standards.
Article
Chemistry, Multidisciplinary
Joanna Kazimierowicz, Marcin Debowski, Marcin Zielinski, Izabela Bartkowska, Adam Wasilewski, Dawid Lapinski, Piotr Ofman
Summary: The most common technology for extracting energy and valuable materials from sewage sludge is anaerobic digestion (AD), which improves outcomes when conducted under thermophilic conditions. However, there is ongoing research to enhance the effectiveness of AD for aerobic granular sludge (AGS) with other methods. One promising method is the pre-treatment of AGS with solidified carbon dioxide (SCO2). This study evaluated the effects of SCO2 pre-treatment on AGS during thermophilic AD, examining changes in organic and biogenic compounds, biogas and methane production, and developing an empirical model for biogas production.
APPLIED SCIENCES-BASEL
(2023)
Article
Agricultural Engineering
Li-Jie Wu, Xiao-Xiao Li, Yu-Xiang Liu, Fan Yang, Quan Zhou, Rui-Peng Ren, Yong-Kang Lyu
Summary: The study optimized hydrothermal pretreatment conditions for continuous mesophilic and thermophilic anaerobic digestion, finding that hydrothermal pretreatment significantly increased methane production and volatile solids reduction in both systems.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Ryoko Yamamoto-Ikemoto, Norihisa Matsuura, Ryo Honda, Hiroe Hara-Yamamura, Kanhchany Some, Sereyroth Prak, Kazuyoshi Koike, Taketo Togari
Summary: This study investigated the effect of gradually decreasing rice straw addition on methane production in the thermophilic anaerobic digestion of sewage sludge. The results showed that reducing rice straw addition did not lead to the accumulation of volatile fatty acids and resulted in stable methane production. Even without rice straw, methane production continued under high ammonia conditions. The digested sludge from the experimental digester exhibited higher ammonia tolerance and was dominated by cellulose-degrading bacteria Clostridia and high ammonia-resistant archaea Methanosarcina. The community remained stable for over 200 days after rice straw supply was discontinued.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xi Lu, Zhiyao Wang, Haoran Duan, Ziping Wu, Shihu Hu, Liu Ye, Zhiguo Yuan, Min Zheng
Summary: The study investigated the production and pathways of nitric oxide (NO) and nitrous oxide (N2O) during acidic sludge digestion. It was found that a significant amount of total nitrogen (TN) was lost, with 40% emitted as NO and 8% as N2O. Batch assays revealed that nitrite reduction and endogenous microbial activities played a role in this process.
Article
Environmental Sciences
Iryna Lanko, Jakub Hejnic, Jana Rihova-Ambrozova, Ivet Ferrer, Pavel Jenicek
Summary: The study compared the digestate quality of single-stage mesophilic and thermophilic AD and TPAD systems, showing that the TPAD system is the most beneficial in terms of organic matter degradation efficiency, dewaterability, and pathogenic safety.
Article
Agricultural Engineering
Shiva Khoei, Abigail Stokes, Brandon Kieft, Paul Kadota, Steven J. Hallam, Cigdem Eskicioglu
Summary: The addition of powdered biochar significantly increased methane production, shortened lag phase, and altered microbial community structure in thermophilic anaerobic digestion.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agronomy
Joern Germer, Christian Brandt, Frank Rasche, Thomas Dockhorn, Alexa Bliedung, Mario Licata
Summary: This study investigated the suitability of different qualities of treated wastewater for plant production in a hydroponic flow-through system. It was found that lettuce grown in ozonised CE, anaerobically pre-treated and nitrified wastewater, and biological activated carbon filtered ANC had similar growth results to those in a modified Hoagland nutrient solution. ANC had the highest yield, but carbon filtration led to cation deficiencies in Fe > Mn > Cu > Zn > K.
Article
Chemistry, Physical
Vignesh Kumaravel, John Bartlett, Suresh C. Pillai
ACS ENERGY LETTERS
(2020)
Review
Chemistry, Physical
Kris O'Dowd, Keerthi M. Nair, Parnia Forouzandeh, Snehamol Mathew, Jamie Grant, Ruth Moran, John Bartlett, Jerry Bird, Suresh C. Pillai
Article
Green & Sustainable Science & Technology
S. O'Connor, E. Ehimen, S. C. Pillai, A. Black, D. Tormey, J. Bartlett
Summary: Small-scale anaerobic digestion (SSAD) is a promising technology for treating livestock manure and organic municipal waste. It has a variety of applications in energy, agriculture, and bio-products sectors, particularly in the European agricultural sector.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Chemistry, Physical
Vignesh Kumaravel, John Bartlett, Suresh C. Pillai
Summary: Recent fire accidents in the electronics and electric vehicles industries have highlighted the importance of addressing thermal runaway reactions, where solid electrolytes play a crucial role in mitigating these issues and prolonging the lifecycle of energy storage devices. Solid electrolytes, such as ceramic polymer nanocomposites, hydrogels, and ionogels, offer solutions for high-temperature stability and flexibility, making them suitable for various applications in next-generation EVs, space devices, aviation gadgets, defense tools, and mobile electronics.
ADVANCED ENERGY MATERIALS
(2021)
Article
Engineering, Environmental
Vignesh Kumaravel, Keerthi M. Nair, Snehamol Mathew, John Bartlett, James E. Kennedy, Hugh G. Manning, Barry J. Whelan, Nigel S. Leyland, Suresh C. Pillai
Summary: This study introduces the engineering of self-disinfecting surfaces using Titania (TiO2) nanocomposite antimicrobial coatings to tackle the spread of SARS-CoV-2, emphasizing on the disinfection efficiency, material composition, and enhanced antimicrobial properties on surfaces, dental and orthopaedic implants. Through evaluating the antimicrobial activity of TiO2 coatings and modifying them with other metals and non-metal materials, new strategies and methods have been proposed to combat the spread of pathogenic microorganisms.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Fernanda Zamboni, Chinonso Okoroafor, Michael P. Ryan, J. Tony Pembroke, Michal Strozyk, Mario Culebras, Maurice N. Collins
Summary: Contamination of biomaterials by Staphylococcus aureus is a major issue in clinical settings, with strategies to decrease biofilm-related infections being vital for the success of implantable devices. Utilizing hyaluronic acid (HA) with crosslinking strategies and reinforcing fibres can produce tailored gels with antimicrobial properties. These HA derivatives show excellent mechanical properties and antibacterial effects against Staphylococcus aureus.
CARBOHYDRATE POLYMERS
(2021)
Article
Biotechnology & Applied Microbiology
Bashir Ghanim, James J. Leahy, Thomas F. O'Dwyer, Witold Kwapinski, J. Tony Pembroke, John G. Murnane
Summary: The study explores the use of modified hydrochar derived from acid-treated poultry litter for the adsorption of Cr(VI) from aqueous solutions. Results show pH-dependent adsorption of Cr(VI) with high capacity and potential for regeneration.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Energy & Fuels
Daniel T. Hickey, Daniel J. Hayes, J. Tony Pembroke, Michael P. Ryan, James J. Leahy
Summary: This study examined the effects of solvent extraction on novel feedstocks, revealing a strong association between Klason lignin levels and non-removed extractives. Additionally, total sugar determinations were lower following extractions, providing more accurate representations of structural cell-wall polysaccharides. Such determinations will assist in determining the best way to utilize novel feedstocks.
Review
Chemistry, Analytical
Sanober Farheen Memon, Ruoning Wang, Bob Strunz, Bhawani Shankar Chowdhry, J. Tony Pembroke, Elfed Lewis
Summary: This review introduces a range of optical fibre-based sensors for measuring ethanol, primarily in aqueous solution. The sensors are classified into four groups based on measurement techniques: absorption, external interferometric, internal fibre grating, and plasmonic sensing. Comparison of these sensors is done based on their characteristic performance indicators, including sensitivity, resolution, and measurement range. The potential application areas of these sensors in ethanol production are discussed, with particular emphasis on their utilization in the industrial and medical sectors driven by the emerging internet of things (IoT). The review concludes with a summary of the current status and future prospects of optical fibre ethanol sensors for industrial use.
Review
Microbiology
Michael P. P. Ryan, Nicolas Carraro, Shannon Slattery, J. Tony Pembroke
Summary: Integrative Conjugative Elements (ICEs) are mosaics that integrate and excise into and from the host genome and can transfer to a specific host range. They encode adaptive functions and have undergone epidemiological and molecular characterization, revealing diversity and function. Comparative analysis shows conservation of key functions and the evolution of adaptive genes through gene acquisition in hotspots and variable regions catalyzed by element-encoded recombinases. SXT/R391 ICEs carry IS elements, transposons, and a mutagenic DNA polymerase PolV, and retain adaptive functions related to specific niches.
CRITICAL REVIEWS IN MICROBIOLOGY
(2023)
Article
Chemistry, Analytical
Sanober Farheen Memon, Ruoning Wang, Bob Strunz, Bhawani Shankar Chowdhry, J. Tony Pembroke, Elfed Lewis
Summary: This paper presents a novel plastic optical fiber (POF) sensor with a balloon-shaped heterocore structure for real-time measurement of ultra-low concentrations of ethanol in microalgal bioethanol production. The sensor demonstrates high sensitivity (3 x 10(6) %/RIU) and resolution (7.9 x 10(-6)RIU) in the ethanol concentration ranges of 20 to 80 %v/v, 1 to 10 %v/v, 0.1 to 1 %v/v, and 0.00633 to 0.0633 %v/v. It is a promising candidate for bioethanol production and ethanol sensing applications.
Editorial Material
Microbiology
Edgardo Moreno, Earl A. Middlebrook, Pamela Altamirano-Silva, Sascha Al Dahouk, George F. Araj, Vilma Arce-Gorvel, Angela Arenas-Gamboa, Javier Ariza, Elias Barquero-Calvo, Giorgio Battelli, Wilson J. Bertu, Jose Maria Blasco, Mile Bosilkovski, Simeon Cadmus, Clayton C. Caswell, Jean Celli, Carlos Chacon-Diaz, Esteban Chaves-Olarte, Diego J. Comerci, Raquel Conde-Alvarez, Elizabeth Cook, Silvio Cravero, Maryam Dadar, Xavier De Boelle, Fabrizio De Massis, Ramon Diaz, Gabriela I. Escobar, Luis Fernandez-Lago, Thomas A. Ficht, Jeffrey T. Foster, Bruno Garin-Bastuji, Jacques Godfroid, Jean-Pierre Gorvel, Leyla Gueler, Sevil Erdenlig-Guerbilek, Amayel M. Gusi, Caterina Guzman-Verri, Jiang Hai, Gabriela Hernandez-Mora, Maite Iriarte, Nestor R. Jacob, Anne Keriel, Maamar Khames, Stephan Kohler, Jean-Jacques Letesson, Maite Loperena-Barber, Ignacio Lopez-Goni, John McGiven, Falk Melzer, Ricardo Mora-Cartin, Jacob Moran-Gilad, Pilar M. Munoz, Heinrich Neubauer, David O'Callaghan, Reuben Ocholi, Angel Onate, Piyush Pandey, Georgios Pappas, J. Tony Pembroke, Martin Roop, Nazaret Ruiz-Villalonos, Michael P. Ryan, Miriam Salvador-Bescos, Felix J. Sangari, Renato de Lima Santos, Aristarchos Seimenis, Gary Splitter, Marcela Suarez-Esquivel, Darem Tabbaa, Marcos David Trangoni, Renee M. Tsolis, Nieves Vizcaino, Gamal Wareth, Susan C. Welburn, Adrian Whatmore, Amaia Zuniga-Ripa, Ignacio Moriyon
Summary: Brucellae and Ochrobactrum spp. should be classified separately due to significant differences in structure, physiology, genomic traits, and pathogenicity.
JOURNAL OF CLINICAL MICROBIOLOGY
(2023)
Article
Environmental Sciences
Sean O'Connor, Ehiaze Ehimen, Suresh C. Pillai, Niamh Power, Gary A. Lyons, John Bartlett
Summary: The study found that approximately 41% of Irish cattle farmers are interested in installing AD technology on their farms within the next five years, with main factors including higher education attainment and potential CO2 reduction from waste feedstock. Moreover, the primary barriers to the implementation of AD technology are lack of information and high investment costs.
Proceedings Paper
Materials Science, Multidisciplinary
Snehamol Mathew, Priyanka Ganguly, Vignesh Kumaravel, John Harrison, Steven J. Hinder, John Bartlett, Suresh C. Pillai
MATERIALS TODAY-PROCEEDINGS
(2020)
Article
Materials Science, Multidisciplinary
Vignesh Kumaravel, Stephen Rhatigan, Snehamol Mathew, Marie Clara Michel, John Bartlett, Michael Nolan, Steven J. Hinder, Antonio Gasco, Cesar Ruiz-Palomar, Daphne Hermosilla, Suresh C. Pillai
JOURNAL OF PHYSICS-MATERIALS
(2020)
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.