Review
Environmental Sciences
Jennifer N. Russell, Christopher K. Yost
Summary: The prevalence of antibiotic resistance in the environment is a critical public health concern, particularly in wastewater treatment environments. Many currently proposed methods for removing antibiotics from wastewater are unsafe for environmental use, leading researchers to seek alternative environmentally safe methods to mitigate environmental antibiotic resistance selection.
Article
Environmental Sciences
Atya Kapley, Mohammed Shahique Sheeraz, Sushrut Kukade, Aamir Ansari, Asifa Qureshi, Abhay Bajaj, Noor Afshan Khan, Shalini Tandon, Rachana Jain, Swapnil Dudhwadkar, Shubhi Sharma, Archana Bharadwaj Siva
Summary: The surge of Antibiotic Resistant Bacteria (ARB) in the environment is poised to be the next health threat, with developing countries being at a greater risk due to untreated wastewater and poor sanitation. This study conducted surveillance of sewage-carrying drains in four urban cities in India, revealing the presence of ARBs in the bacterial community against multiple classes of antibiotics. The report emphasizes the importance of routine sewage surveillance by state authorities.
ENVIRONMENTAL POLLUTION
(2023)
Article
Infectious Diseases
Mohammad Irfan, Alhomidi Almotiri, Zeyad Abdullah AlZeyadi
Summary: Hospital and municipal wastewater contribute to the spread of antibiotic-resistant bacteria and genes in the environment. This study examined the antibiotic resistance and beta-lactamase production in clinically significant Gram-negative bacteria isolated from hospital and municipal wastewater. The results showed a significant rate of bacteria that produce ESBL and carbapenemase, which can promote the spread of bacterial resistance. Identifying ESBL and carbapenemase production genes in wastewater samples and their resistance patterns can provide valuable data and guide the development of pathogen management strategies to reduce multidrug resistance.
Article
Microbiology
Dengwei Zhang, Ye Peng, Chak-Lun Chan, Hilda On, Hogan Kok-Fung Wai, Sandeep Singh Shekhawat, Akhilendra Bhushan Gupta, Alok Kumar Varshney, Rungtip Chuanchuen, Xudong Zhou, Yankai Xia, Suisha Liang, Keiji Fukuda, Krishna Mohan Medicherla, Hein M. Tun
Summary: Our study in Jaipur City, India, found lower abundance of ARGs in a hospital wastewater treatment plant compared to municipal wastewater treatment plants, which showed enrichment of tetracycline and macrolide-lincosamide-streptogramin resistance genes. Hospital wastewater had a higher abundance of genes conferring resistance to disinfectant-related compounds. Additionally, a strong correlation was found between the numbers of ARGs and BMRGs potentially harbored by common hosts in wastewater systems with more chemicals.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Jakub Hubeny, Ewa Korzeniewska, Slawomir Ciesielski, Grazyna Plaza, Monika Harnisz
Summary: This study quantified ESKAPEE bacteria, antibiotic resistance genes, and integrase genes in municipal wastewater and river water. The presence of A. baumannii, E. coli, and resistance genes was detected downstream from the wastewater discharge point, posing a public health risk.
Article
Environmental Sciences
Lei Chen, Mengyu Zhang, Daliang Ning, Joy D. Van Nostrand, Yunfeng Yang, Jizhong Zhou, Jiane Zuo
Summary: High concentrations of antibiotics in antibiotic production wastewater can lead to the widespread transmission of antibiotic resistance genes. However, this study found that specific antibiotic resistance genes were enriched and spread under environmental pressures, contrary to traditional beliefs. The genes were likely transmitted through microorganisms belonging to specific genuses.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Environmental Sciences
Hannah C. Lepper, Meghan R. Perry, Bryan A. Wee, David Wills, Hanne Nielsen, Saria Otani, Moray Simon, Frank M. Aarestrup, Mark E. J. Woolhouse, Bram A. D. van Bunnik
Summary: This study compares the resistome and microbiome of hospital, community, and mixed municipal wastewater and finds that the resistome in hospital wastewater is different from that in other locations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Sara Gallego, Nicola Montemurro, Jeremie Beguet, Nadine Rouard, Laurent Philippot, Sandra Perez, Fabrice Martin-Laurent
Summary: The study evaluated the ecotoxicological risks of using wastewater for crop irrigation by assessing the fate of micropollutants in soil and their impact on plants and soil microorganisms. The results showed changes in soil bacterial community structure due to wastewater irrigation, but the bacterial evenness remained stable.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Pingping Chen, Xiaofei Yu, Jingyao Zhang
Summary: This study combines photocatalytic technology with constructed wetlands to efficiently remove antibiotic resistance genes (ARGs). Results show that photocatalysis and constructed wetlands together increase the effectiveness of ARGs removal, with different mechanisms for intracellular and extracellular ARGs. The addition of nano-TiO2 alters the microorganisms in constructed wetlands, leading to an increase in the removal of potential hosts for target ARGs.
Article
Microbiology
Indorica Sutradhar, Carly Ching, Darash Desai, Mark Suprenant, Emma Briars, Zachary Heins, Ahmad S. Khalil, Muhammad H. Zaman
Summary: A mathematical model was developed to predict the growth of antibiotic-resistant populations in wastewater, showing that low levels of antibiotic residues and horizontal gene transfer are key factors in resistance acquisition. Additionally, synergistic antibiotics at low concentrations were found to lead to increased resistant population growth.
Article
Environmental Sciences
JiaJia Xue, Dandan Lei, Xiumei Zhao, Yaru Hu, Shijie Yao, Kuangfei Lin, Zejian Wang, Changzheng Cui
Summary: This study investigated the wastewater quality indicators, residual antibiotics, and biological toxicity of the wastewater during the production process in a large pharmaceutical producing factory in Northern China. The wastewater contained numerous organic pollutants and exhibited high biological toxicity.
Article
Microbiology
Maitreyee Mukherjee, Edward Laird, Terry J. Gentry, John P. Brooks, Raghupathy Karthikeyan
Summary: This study revealed wastewater treatment plants as hotspots for the spread of antimicrobial resistance (AMR) and multidrug resistance (MDR), with downstream locations showing significantly higher concentrations of antibiotic-resistant heterotrophs and antibiotic resistance genes (ARGs) compared to upstream sites. The findings support the need for improved environmental regulations and practices to manage AMR/MDR and ARG discharges into the environment.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
A. Kolokotsa, M. Leotsinidis, I. Kalavrouziotis, E. Sazakli
Summary: The study aimed to investigate whether changes in the population size and composition in the popular tourist destination of Zakynthos island are associated with differentiation in the antibiotic resistance of environmental micro-organisms isolated from wastewater. The results showed that an increase in population due to tourist flows was associated with a decrease in antibiotic resistance of E. coli and an increase in quinupristin-dalfopristin resistant enterococci.
JOURNAL OF APPLIED MICROBIOLOGY
(2021)
Article
Environmental Sciences
Jakub Hubeny, Ewa Korzeniewska, Martyna Buta-Hubeny, Wiktor Zielinski, Damian Rolbiecki, Monika Harnisz
Summary: This study aimed to analyze the prevalence of carbapenem resistance genes in Acinetobacter spp. isolated from wastewater in a municipal WWTP and to determine their spread from treated wastewater to river water. The research found evidence that WWTP is a potential source of pollution, leading to the spread of alarming beta-lactam resistance genes in the natural environment, posing a serious epidemiological threat.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Microbiology
Luminita Gabriela Marutescu, Marcela Popa, Irina Gheorghe-Barbu, Ilda Czobor Barbu, Daloha Rodriguez-Molina, Fanny Berglund, Hetty Blaak, Carl-Fredrik Flach, Merel Aurora Kemper, Beate Spiessberger, Laura Wengenroth, D. G. Joakim Larsson, Dennis Nowak, Katja Radon, Ana Maria de Roda Husman, Andreas Wieser, Heike Schmitt, Gratiela Pircalabioru Gradisteanu, Corneliu Ovidiu Vrancianu, Mariana Carmen Chifiriuc
Summary: Antibiotics are essential in reducing mortality and morbidity rates from infectious diseases, but their misuse has led to accelerated evolution of antibiotic resistance. Wastewater treatment plants are important reservoirs of resistant pathogens, and strategies to prevent their release into the environment should be developed.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Biodiversity Conservation
Hao Liao, Xiuli Hao, Fei Qin, Manuel Delgado-Baquerizo, Yurong Liu, Jizhong Zhou, Peng Cai, Wenli Chen, Qiaoyun Huang
Summary: Microbial communities have critical roles in fixing carbon from the atmosphere and fixing it in the soils, but their large-scale variations and drivers are poorly understood. This study conducted a large-scale survey in China and found that soil autotrophic organisms, such as bacteria and protists, are crucial for explaining CO2 fluxes from the atmosphere to soils. The fixation rates of CO2 were significantly correlated to the variations in autotrophic bacteria and phototrophic protists.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Environmental Sciences
Haodi Feng, Mei Tang, Ziming Han, Xiao Luan, Chunmeng Ma, Min Yang, Jiuyi Li, Yu Zhang
Summary: An accurate analytical method was developed to quantify erythromycin A, byproducts, and hydrolysis or biodegradation products in erythromycin fermentation residue (EFR) and amended soil. The method achieved effective extraction and high recoveries for all analytes. EFR, treated EFR, and amended soils were analyzed, and several analytes were detected. The method was useful for evaluating the potential risk of erythromycin A byproducts and transformation products in the environment.
Article
Environmental Sciences
Jinyi Qin, Jiao Fang, Fei Gao, Yiwen He, Ming Su, Yu Zhang, Min Yang
Summary: This study investigated the treatment of Ethinyl Estradiol (EE2) in swine wastewater using an Upstream Solids Reactor (USR), and proposed a new method for bio-feeding regulation to enhance the anaerobic biodegradation process. The addition of propionic acid was found to be more effective in enhancing the removal of EE2 compared to lactic acid. However, controlling the pH at extreme values hindered the fermentation process and negatively affected EE2 removal. The study provides insights into the anaerobic biodegradation of EE2 and suggests a new strategy for the bioremediation of refractory pollutants.
Article
Environmental Sciences
Binhao Wang, Bin Ma, Erinne Stirling, Zhili He, Hangjun Zhang, Qingyun Yan
Summary: Freshwater microorganisms and their interactions are influenced by nutrient status, which leads to changes in microbial community diversity. However, the impact of trophic status on bacterial-archaeal interdomain interactions is not well understood. This study found that the mesotrophic wetland had a more complex bacterial-archaeal interdomain network compared to wetlands with lower or higher trophic levels.
ENVIRONMENTAL POLLUTION
(2023)
Article
Agricultural Engineering
Xuanyu Tao, Josiah S. Morgan, Jiantao Liu, Megan L. Kempher, Tao Xu, Jizhong Zhou
Summary: In this study, CRISPR-Cas9n was used to integrate an efficient beta-glucosidase into the genome of C. cellulolyticum, disrupting lactate dehydrogenase (ldh) expression and reducing lactate production. The engineered strain showed significant improvements in cellulose degradation and ethanol production. These results demonstrate that simultaneous beta-glucosidase integration and lactate dehydrogenase disruption is an effective strategy for increasing cellulose to ethanol bioconversion rates in C. cellulolyticum.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Hao Wang, Hanlin Cui, Xiaodan Ma, Carolyn R. Cornell, Liying Zhang, Yijun Ren, Minghan Li, Ying Liu, Shu-Hong Gao, Zhiling Li, Ai-Jie Wang, Jizhong Zhou, Bin Liang
Summary: The widespread use of the antimicrobial substance triclocarban (TCC) has raised concerns about its impacts on wastewater treatment systems, the environment, and human health. This study investigated the adsorption of TCC by sludge and extracellular polymeric substances (EPS) in a multistage biological process. The results showed that EPS had a higher adsorption capacity for TCC than sludge, potentially due to its loose multilayer structure and abundant functional groups. TCC also had adverse effects on the biological removal of ammonia nitrogen. Our study provides molecular-level insights into the interaction between TCC and activated sludge, and evaluates the risks associated with its presence in wastewater treatment systems through computational modeling.
CHEMICAL ENGINEERING JOURNAL
(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)
Article
Geosciences, Multidisciplinary
Yifan Xu, Huanping Liu, Yufeng Yang, Hongtao Shen, Ruimin Zhang, Cheng Wang, Zhijian Huang, Jianguo He, Zhili He, Qingyun Yan
Summary: This study proposes a method to assess the net carbon sink of marine macroalgae (Gracilaria) cultivation and predicts its future trends. The findings show that the net carbon sink of Gracilaria cultivation in China was about 32.1-92.4 kilotons per year from 2011 to 2020 and exhibits a significant annual growth trend. The predicted net carbon sink of Gracilaria cultivation is expected to increase to 77.8-191.4 kilotons per year from 2021 to 2030, which could contribute significantly to China's carbon peak goal. Furthermore, using Gracilaria for ruminant green feed production is predicted to reduce carbon emissions (methane) by 0.33-0.68 tons per ton of macroalgae.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Environmental Sciences
Zihe Wang, Wei Huang, Zhiwei Liu, Jiaxiong Zeng, Zhili He, Longfei Shu
Summary: This study investigated the effects of imidacloprid on the growth and development of a soil amoeba and found that it negatively impacted their fitness and development. The adverse effects did not show a dose-response relationship with increased imidacloprid concentrations. Transcriptome analyses showed that imidacloprid affected key genes related to various cellular processes in amoebae.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Wenli Fan, Guangxi Sun, Qi Wang, Fan Yang, Yingxin Gao, Min Yang
Summary: This study investigated the role of activated carbon properties in the adsorption of effluent organic matter (EfOM) from bio-treated coking wastewater. Commercial powdered activated carbons (PACs) with different pore structures, surface functional groups, and surface charges were used. The results showed that the adsorption of EfOM depended on its molecular size, with biopolymers being adsorbed by macropores and humics being adsorbed by mesopores. PACs with higher mesopore volume, fewer acidic groups, and higher isoelectric point were found to be more effective in removing EfOM.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Ya Zhang, Daliang Ning, Linwei Wu, Mengting Maggie Yuan, Xishu Zhou, Xue Guo, Yuanliang Hu, Siyang Jian, Zhifeng Yang, Shun Han, Jiajie Feng, Jialiang Kuang, Carolyn R. Cornell, Colin T. Bates, Yupeng Fan, Jonathan P. Michael, Yang Ouyang, Jiajing Guo, Zhipeng Gao, Zheng Shi, Naijia Xiao, Ying Fu, Aifen Zhou, Liyou Wu, Xueduan Liu, Yunfeng Yang, James M. Tiedje, Jizhong Zhou
Summary: The authors investigated the response of Archaea to experimental warming in a tallgrass prairie ecosystem and found that warming led to reduced diversity and convergent succession in the archaeal community. They also observed changes in ecosystem function. Although stochastic processes dominated community changes, their importance decreased over time. This study highlights the importance of understanding the temporal succession of ecological communities and the mechanisms underlying their responses to climate warming. The findings provide insights into the response of the Archaea domain to warming, which is still poorly understood.
NATURE CLIMATE CHANGE
(2023)
Article
Microbiology
Jugui Zhuang, Ruihuan Zhang, Yufei Zeng, Tianjiao Dai, Zhencheng Ye, Qun Gao, Yunfeng Yang, Xue Guo, Guanghe Li, Jizhong Zhou
Summary: This study investigated the effects of petroleum pollution on soil microbial diversity, community structure, and network co-occurrence patterns in an abandoned refinery. The results showed that high levels of C10-C40 decreased soil microbial α-diversity and caused significant changes in community structure. However, the complexity of soil microbial networks increased with petroleum pollution levels, indicating more intricate microbial interactions.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Xuanyu Tao, Huanrong Ouyang, Aifen Zhou, Dongyu Wang, Hagan Matlock, Josiah S. Morgan, Abigail T. Ren, Dashuai Mu, Chongle Pan, Xuejun Zhu, Arum Han, Jizhong Zhou
Summary: In this study, a Rhodococcus strain A34 was isolated from naturally weathered plastic waste and potential key polyethylene degradation enzymes were identified. The degradation of polyethylene and the associated metabolic pathways were investigated through proteomics analysis. The findings provide valuable insights for optimizing plastic degradation conditions and assembling artificial microbial communities for efficient plastic degradation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lei He, Shan -Shan Yang, Jie Ding, Zhi-Li He, Ji-Wei Pang, De-Feng Xing, Lei Zhao, He -Shan Zheng, Nan-Qi Ren, Wei-Min Wu
Summary: In this study, it was demonstrated that mealworms were able to rapidly biodegrade PET with high efficiency, with a reduction in mass and molecular weight. The gut microbial community of the mealworms played a crucial role in PET degradation, and various metabolic pathways were up-regulated in response to PET intake. This research provides new insights into the adaptation of gut microbes to a PET diet and their contribution to PET degradation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Multidisciplinary Sciences
Yichao Wu, Chengxia Fu, Caroline L. Peacock, Soren J. Sorensen, Marc A. Redmile-Gordon, Ke-Qing Xiao, Chunhui Gao, Jun Liu, Qiaoyun Huang, Zixue Li, Peiyi Song, Yongguan Zhu, Jizhong Zhou, Peng Cai
Summary: Cooperative interactions between free-living and biofilm-forming bacteria are found to drive spatial segregation and enable species coexistence in a microfluidic chip environment, promoting their respective dominance in segregated microhabitats. This active spatial segregation is induced by cooperative interactions, improving the fitness of both biofilm and planktonic populations. The study also shows that free-living Arthrobacter induces surface colonization and receives benefits from public goods secreted by biofilm-forming strains.
NATURE COMMUNICATIONS
(2023)
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.
