Article
Environmental Sciences
Jinsen Zhang, Guo-hua Liu, Qi Wei, Shuai Liu, Yuting Shao, Jingbing Zhang, Lu Qi, Hongchen Wang
Summary: Understanding microbial community structure in activated sludge systems at a regional level is important for the operation of wastewater treatment plants. This study analyzed 110 activated sludge samples from 21 cities in different regions of China using high-throughput 16S ribosomal DNA sequencing. The results showed that different characteristics of regions, such as south vs. north, coastal vs. inland, and high GDP vs. low GDP, had a significant impact on the bacterial community in activated sludge. Core bacterial communities were more abundant in the south, and many species in these communities were associated with nutrient removal. Coastal wastewater treatment plants had unique bacterial communities influenced by marine bacteria. High GDP regions had more diverse microbial communities and effective wastewater treatment. The assembly of microbial communities was mainly influenced by deterministic factors, with influent quality as the main factor.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Yabing Xiao, Yao Shen, Bin Ji
Summary: This research focused on cultivating MBGS from activated sludge by inoculation. The results showed that inoculation helped in the successful formation of MBGS within a short period of time, and achieved stable removal of organics, ammonia, and phosphorus. Functional microbial communities, including phosphorus accumulating organisms, were enhanced by the inoculation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Biotechnology & Applied Microbiology
Huihui Wang, Shaoping Kuang, Qiaolin Lang, Lei Wang
Summary: The study investigated the screening of dominant or core oil resistant bacteria in Aged Oil Sludge (AOS) contaminated soil in Daqing and Shengli oilfields in China using High-Throughput Sequencing method. It found that certain microbial genera were significantly enriched after oil treatment, indicating their possible role in the attenuation of petroleum hydrocarbons. The toxicological effect of AOS on the diversity and community structure of bacteria was notable, with Firmicutes showing reduction at phylum level after treatment.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Biodiversity Conservation
Meide Zhang, Yinsheng He, Wuxian Zhou, Lunqiang Ai, Haihua Liu, Liang Chen, Yan Xie
Summary: Continuous cropping of Codonopsis tangshen resulted in a decline in both yield and quality, as well as a decrease in rhizospheric soil bacterial abundance and alteration of microbial community structure. Redundancy analysis indicated that organic matter content and available nitrogen content had the strongest impact on bacterial community structure in continuous cropping soil.
Article
Agricultural Engineering
Wei Li, Yuming Zhen, Nan Li, Hengqi Wang, Minghui Lin, Xiuting Sui, Wanying Zhao, Ping Guo, Jianguo Lin
Summary: Different types of microbial aggregates have significant effects on bacterial community characteristics and pollutant removal. Specific metabolic pathways for sulfur and nitrogen pollutants in the desulfurization-denitrification process were proposed. Sulfur-oxidizing bacteria and sulfur-reducing bacteria play distinct roles in suspended sludge and biofilms.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Shidi Liu, Daying Chen, Zhimin Wang, Minglu Zhang, Minghan Zhu, Meilin Yin, Tingting Zhang, Xiaohui Wang
Summary: The long-term effects of ibuprofen on nutrient removal, community compositions, and microbial interactions in the activated sludge system were explored in this study. Ibuprofen did not inhibit the removal of organic matters and nutrients, but significantly reduced microbial diversity and changed the bacterial community structure. Different phylogenetic populations had different responses to ibuprofen, with some increasing and others decreasing under ibuprofen stress. The study also found that ibuprofen reduced the overall network size and links, but led to a closer network with more efficient communication among microbes.
Article
Biology
Fehmida Bibi, Esam Ibraheem Azhar
Summary: This study investigated the microbial diversity of two sponges and a coral sample from the Red Sea in Saudi Arabia using pyrosequencing. The results revealed that sponge H. caerulea had significantly high bacterial diversity and identified 17 different bacterial genera across the three samples.
SAUDI JOURNAL OF BIOLOGICAL SCIENCES
(2021)
Article
Microbiology
Alejandro Ledezma-Villanueva, Tatiana Robledo-Mahon, Cinta Gomez-Silvan, Gabriela Angeles-De Paz, Clementina Pozo, Maximino Manzanera, Concepcion Calvo, Elisabet Aranda
Summary: Emerging and unregulated contaminants in soils can be treated through bioremediation using native microorganisms. Enrichment experiments have shown that certain fungi and bacteria have the capability to degrade pollutants, indicating their potential use in tailored bioremediation techniques.
Article
Environmental Sciences
Duanyi Huang, Rui Xu, Xiaoxu Sun, Yongbin Li, Enzong Xiao, Zhimin Xu, Qi Wang, Pin Gao, Zhaohui Yang, Hanzhi Lin, Weimin Sun
Summary: This study investigates the effects of Perfluorooctanoic acid (PFOA) on the microbial communities of activated sludge in wastewater treatment plants. The results show that continued exposure to PFOA leads to a decrease in microbial richness and substantial shifts in bacterial diversity and composition under both aerobic and anaerobic conditions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Food Science & Technology
Hiran Castagnino Kunert-Filho, Thales Quedi Furian, Renata Sesterhenn, Gabriela Zottis Chitolina, Daiane Elisa Willsmann, Karen Apellanis Borges, Carlos Tadeu Pippi Salle, Hamilton Luiz de Souza Moraes, Vladimir Pinheiro do Nascimento
Summary: Poultry products are prone to contamination by microorganisms during the slaughtering process. High-throughput next generation sequencing (HT-NGS) allows for precise and culture-independent assessment of the microbiome in poultry carcasses. Differences in microbiome composition were observed among slaughterhouses, with some unique microorganisms detected in specific establishments. Significant reductions in microbial sequences were found as the slaughtering process progressed, and stricter control procedures were associated with lower contamination. These findings provide valuable insights for ensuring food safety in slaughterhouses.
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
(2022)
Article
Environmental Sciences
Yonggang Wang, Jiangqin Wang, Feifan Leng, Jixiang Chen
Summary: 454 pyrosequencing was used to analyze the microbial community and diversity of oily farmland soil from Fushun, Liaoning Province, China. The study found that petroleum hydrocarbons significantly altered the structure and diversity of soil microbial communities, with dominant bacterial flora changing in oil-contaminated areas.
GEOMICROBIOLOGY JOURNAL
(2021)
Article
Engineering, Environmental
Jun-Gyu Park, Beom Lee, Ui-Jung Lee, Hang-Bae Jun
Summary: This study investigates the microbial communities and operational performances of a conventional anaerobic digester (AD) and an AD combined with microbial electrolysis cells (ADMEC). The results show that ADMEC is more efficient than AD, with accelerated organic degradation and methanol production, creating a favorable environment for the growth of methylotrophic methanogens in the solution.
ENVIRONMENTAL ENGINEERING RESEARCH
(2022)
Article
Engineering, Environmental
B. van Veenhuyzen, S. Tichapondwa, C. Horstmann, E. Chirwa, H. G. Brink
Summary: Chemically activated waste activated sewage sludge showed potential for Pb(II) adsorption, with ZnCl2 activation significantly increasing adsorption capacity and surface area without changing the surface structure. However, HCl and H2SO4 activation ceased the adsorption process. Additionally, cationic exchange with hydrogen, calcium, and zinc was identified as a significant mechanism for Pb(II) removal.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Yu Jin, Wei Xiong, Nan Zhou, Gang Xiao, Shaojie Wang, Haijia Su
Summary: The structure of bacterial community in seed sludge varies greatly from different sources, influencing the characteristics of sludge. This study investigated the role of different functional bacteria in AGS granulation and pollutant degradation using seed sludge obtained from different sources. Results showed that the initial bacterial community significantly affected AGS formation and pollutants removal, with seed sludge from municipal sludge granulating faster and achieving better settling performance and granulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Qingmiao Yu, Xianda Hu, Fuzheng Zhao, Chenyu Zhu, Linchang Guan, Hongqiang Ren, Jinju Geng
Summary: This study analyzed the effect of dissolved organic matter (DOM) composition on the removal efficiency of NGT in wastewater treatment plants (WWTPs). The results showed that DOM composition was a significant factor in NGT removal, and its effect was mediated by regulating core microbial communities.
Article
Water Resources
Chao Chen, Keith Hayward, Stuart J. Khan, Banu Ormeci, Sudhir Pillay, Joan B. Rose, Joseph Thanikal, Tong Zhang
Summary: The International Water Association established a Task Force in 2020 to provide knowledge on COVID-19 control for water professionals and industries worldwide. The Task Force aims to offer guidance on risk management and response to global virus outbreaks, with a focus on understanding and controlling the impact of the pandemic.
WATER QUALITY RESEARCH JOURNAL
(2021)
Article
Engineering, Environmental
Yulin Wang, Wei Qin, Xiaotao Jiang, Feng Ju, Yanping Mao, Anni Zhang, David A. Stahl, Tong Zhang
Summary: The study revealed a seasonal prevalence of ammonia-oxidizing archaea (AOA) in a wastewater treatment plant in Shatin, Hong Kong, over a 6-year observation period. Factors such as high bioavailable copper concentrations and the use of seawater for toilet flushing were found to influence the abundance of AOA. The study also highlighted the importance of long-term observation in understanding the dynamics of microbial populations in open systems like full-scale wastewater treatment plants.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
You Che, Yu Yang, Xiaoqing Xu, Karel Brinda, Martin F. Polz, William P. Hanage, Tong Zhang
Summary: The study found that plasmid-borne antimicrobial resistance genes are mainly enriched in conjugative plasmids. Scientists reported the discovery of a massive insertion sequence-associated antimicrobial resistance gene transfer network, suggesting a general evolutionary mechanism for horizontal gene transfer mediated by the interaction between conjugative plasmids and ISs. Experimental results confirmed the importance of these interactions in aiding the horizontal transfer and expanding the genetic range of antimicrobial resistance genes within complex microbial communities.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Environmental
Yue Huang, Yu Deng, Japhet Cheuk-Fung Law, Yu Yang, Jiahui Ding, Kelvin Sze-Yin Leung, Tong Zhang
Summary: Next-generation sequencing methods were used to explore the ACE-degrading communities enriched from activated sludge, revealing four metagenome-assembled genomes that may be responsible for ACE biodegradation. Additionally, two ACE-degrading pure strains affiliated to Chelatococcus genus showed high degradation capability and could mineralize around 90% of total organic carbon. This study provides valuable insights into ACE biodegradation and its biotransformation products.
Article
Engineering, Environmental
Yulin Wang, Renxin Zhao, Lei Liu, Bing Li, Tong Zhang
Summary: The study found that different types and concentrations of antibiotics can affect the taxonomic composition of microbial communities in activated sludge, including comammox. Four antibiotics were selectively enriched comammox Nitrospira, and genomic analysis showed shared metabolic potentials among the enriched comammox. The findings suggest that comammox in activated sludge ecosystems have higher metabolic versatility and can be selectively enriched by certain antibiotics.
Article
Multidisciplinary Sciences
An-Ni Zhang, Jeffry M. Gaston, Chengzhen L. Dai, Shijie Zhao, Mathilde Poyet, Mathieu Groussin, Xiaole Yin, Li-Guan Li, Mark C. M. van Loosdrecht, Edward Topp, Michael R. Gillings, William P. Hanage, James M. Tiedje, Katya Moniz, Eric J. Alm, Tong Zhang
Summary: Antibiotic resistance genes are common among bacteria, but not all pose high risks to human health. Researchers have developed an omics-based framework to rank these genes by risk, taking into account their enrichment in human associated environments, gene mobility, and host pathogenicity.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Yiqiang Chen, Yulin Wang, David Paez-Espino, Martin F. Polz, Tong Zhang
Summary: This study presents a catalogue of approximately 50,000 prokaryotic viruses from six WWTPs, significantly increasing the known diversity of AS viruses. Most viral genera are found in multiple AS systems, spanning various archaeal and bacterial phyla, and linked with functional microorganisms controlling nitrogen/phosphorous removal. Notably, Mycobacterium, associated with AS foaming, is connected with 402 viral genera. These findings expand the current AS virus catalogue and provide insights for phage treatment in controlling undesired microorganisms in WWTPs.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Xiaoqing Xu, Xiawan Zheng, Shuxian Li, Nga Sze Lam, Yulin Wang, Daniel K. W. Chu, Leo L. M. Poon, Hein Min Tun, Malik Peiris, Yu Deng, Gabriel M. Leung, Tong Zhang
Summary: This study implemented sewage testing for SARS-CoV-2 virus across sampling sites with different characteristics and detected the virus in samples from a COVID-19 hospital isolation ward with the highest viral titer observed. The virus was also detected 2 days before identification in sewage samples from individual buildings.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xiuwen Zhang, Suwan Liu, Haohao Sun, Kailong Huang, Lin Ye
Summary: This study investigated the impact of adding different organic pollutants on the occurrence of antibiotic resistance genes (ARGs) in activated sludge. The results showed that antibiotics not only increased the abundance of ARGs, but also significantly changed their compositions. Gram-negative bacteria were found to be the main carriers of ARGs, and significant co-occurrence relationships between ARGs and mobile genetic elements were observed in the sludge samples.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
Yuxuan Liu, Ling Chen, Jing Yu, Lin Ye, Haidong Hu, Jinfeng Wang, Bing Wu
Summary: The application of single-cell toxicogenomics in environmental toxicology has the potential to revolutionize the field. This technology offers high-resolution, high-throughput, and high-specificity analysis methods for identifying target cells of pollutants, studying the heterogeneous response of cell subtypes to pollutants, and discovering pathogenic bacteria in unknown microbes. These advances will contribute to improving our understanding of the physiological processes affected by pollutants and provide new methods for pollution control.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Haohao Sun, Juntao Xia, Bing Wu, Hongqiang Ren, Xuxiang Zhang, Lin Ye
Summary: This study reported an aerobic starvation approach to improve the degradation efficiencies of refractory organic compounds (ROCs) in activated sludge systems. The findings showed that the degradation ability of bisphenol A (BPA) was enhanced by increasing the relative abundance of BPA degrading bacteria, while the degradation of bisphenol AF (BPAF) and gabapentin (GBP) was attributed to the increase of the expression of ROC degrading genes.
Article
Engineering, Environmental
Jiayu Zhang, Chao Yang, Jiahui Hu, Yiting Zhang, Yuezheng Lai, Hongri Gong, Fangliang Guo, Xiaoyan Li, Lin Ye, Bing Li
Summary: This study discovered a novel antibiotic resistance gene capO and elucidated its role in chloramphenicol resistance, indicating its potential mobility and accumulation in wastewater treatment, which provides important insights for tackling the antibiotic resistance crisis.
Article
Engineering, Environmental
Shuyu Jia, Xinran Gao, Yangyang Zhang, Peng Shi, Chen Wang, Qing Zhou, Lin Ye, Xu-Xiang Zhang
Summary: Although tertiary wastewater treatment processes (TWTPs) have high removal efficiency for chemical pollutants, their impact on microbial risk mitigation is uncertain. This study used metagenomic approaches to investigate the changes of antibiotic resistance genes (ARGs), virulence factor genes (VFGs), and their co-occurrence during multiple TWTPs. It was found that the denitrifying biofilter (DB) increased the abundance of antibiotic-resistant bacteria and ARGs, as well as the relative abundance of ARGs and VFGs through the enrichment of multidrug resistance and offensive genes. Complementary microbial risk reduction was achieved through ultraviolet and constructed wetland treatment. The study provides new insights into the effects of TWTPs on the antibiotic resistome and VFG profiles, and aids in selecting appropriate TWTPs for microbial risk mitigation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yuxuan Liu, Xin Ling, Runren Jiang, Ling Chen, Lin Ye, Yonghua Wang, Guanghua Lu, Bing Wu
Summary: This study establishes a new method for detecting microplastics from known materials, reporting that contact lenses can release microplastics and pose a risk to human health. The widespread use of plastic products leads to the prevalence of microplastics in daily life, but the release of microplastics from contact lenses has not been reported due to limitations in detection methods. The study highlights the urgent need to assess the potential health risks caused by eye exposure to microplastics.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yanyan Ma, Dongni Rui, Haonan Dong, Xuxiang Zhang, Lin Ye
Summary: This study investigated the bacterial communities in activated sludge samples from 966 bioreactors of various scales, revealing significant differences between full- and lab-scale reactors. Machine learning analysis identified organic matter and temperature as the primary factors affecting microbial communities. Transient bacterial species from other environments may also contribute to the observed differences. The bacterial community differences were verified by comparing lab-scale experiments to full-scale sampling.
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.
