Article
Environmental Sciences
Haiyang Yu, Xuechen Zhang, Xiangtian Meng, Dan Luo, Xinhui Liu, Guangbin Zhang, Chunwu Zhu, Yaying Li, Yongxiang Yu, Huaiying Yao
Summary: This study found that long-term elevation of CO2 concentration reduces methane emissions from paddy fields, which may be attributed to the decrease in methanogenic abundance and the increase in methanotrophic abundance. Additionally, long-term CO2 elevation also alters the community structure and composition of methanogens and methanotrophs compared to short-term CO2 elevation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Giulia Zazzeri, Heather Graven, Xiaomei Xu, Eric Saboya, Liam Blyth, Alistair J. Manning, Hannah Chawner, Dien Wu, Samuel Hammer
Summary: The C-14 levels in methane and carbon dioxide were observed in an urban area (London) using a newly developed sampling system. The observed values surpassed the simulated values, indicating higher fossil fuel proportions and atmospheric concentrations. The correlation between observed and simulated net biospheric uptake was poor in June-July.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Jinzhang Jia, Yumo Wu, Dan Zhao, Bin Li, Dongming Wang, Fengxiao Wang
Summary: To understand the mechanism of gas adsorption by different functional groups in coal, a slit-pore model and modified fragment model were developed using Materials Studio software. The study revealed the adsorption characteristics and performance of seven different functional groups on CH4/CO2/N2 gases. The results showed that the electrophilic and nucleophilic abilities of the functional groups varied, and the adsorption capacity was influenced by both gas properties and functional group structure.
Article
Forestry
Aleksandr F. Sabrekov, Olga V. Danilova, Irina E. Terentieva, Anastasia A. Ivanova, Svetlana E. Belova, Yuri V. Litti, Mikhail V. Glagolev, Svetlana N. Dedysh
Summary: Upland forest ecosystems in West Siberia are important sinks for atmospheric methane due to the activity of aerobic methanotrophic bacteria. Methane uptake rates were high and consistent across different forest types, with soil methane oxidation rate negatively correlated with water-filled pore space. Dominant microbial communities in the soil included Alpha- and Gammaproteobacteria, Acidobacteriota, and Actinobacteriota.
Article
Engineering, Chemical
Jingguo Jia, Yunsheng Wang, Yajing Feng, Guoqi Hu, Jing Lin, Yang Huang, Yujie Zhang, Zhenya Liu, Chengchun Tang, Chao Yu
Summary: The study demonstrates the structure and CO2 adsorption performance of p-BN/HKUST-1 hybrid materials, with findings that mesopores can be controlled by adjusting the HKUST-1 content and growth cycles to enhance gas transmission quality and CO2 adsorption capacity. The hybrid materials prepared under optimal conditions exhibit excellent adsorption stability, with high CO2/N2 and CO2/CH4 adsorption selectivities predicted by the IAST model under specific conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Environmental Sciences
Bernardo Duarte, Alexandra Baeta, Joao Carlos Marques, Isabel Cacador
Summary: Atmospheric CO2 enrichment, largely caused by human activities, affects sediment microbial communities in plant rhizospheres. This study aimed to evaluate this interaction in Spartina maritima rhizosediments and investigate the impacts of increased atmospheric CO2 on biogeochemical processes. Mesocosm trials were conducted using salt marsh cores exposed to 410 and 700 ppm CO2, and rhizosediment extracellular enzymatic activities were assessed. The results showed an increase in dehydrogenase and phosphatase activity under elevated CO2, indicating a priming effect and higher phosphate requirements for microbial activity. Sulphatase activity also increased, suggesting sulphur limitation due to elevated CO2. Protease activity decreased, possibly due to increased amino acid synthesis and acquisition needs. Carbon-related enzymes generally increased under higher CO2 levels. The altered recycling activity of organic compounds may disrupt biogeochemical cycles and affect rhizosphere ecosystem function and ecosystem services.
Article
Engineering, Civil
Fenghui Yuan, Yihui Wang, Daniel M. Ricciuto, Xiaoying Shi, Fengming Yuan, Thomas Brehme, Scott Bridgham, Jason Keller, Jeffrey M. Warren, Natalie A. Griffiths, Stephen D. Sebestyen, Paul J. Hanson, Peter E. Thornton, Xiaofeng Xu
Summary: Peatland carbon cycling is crucial for greenhouse gas exchange, with warming and elevated CO2 levels impacting methane emission directly and indirectly through hydrological processes. The ELM-SPRUCE model demonstrates the importance of water table in regulating methane dynamics, showing that while warming increases methane emission, hydrological feedbacks can mitigate this effect. The impact of CO2 on hydrological feedback is less pronounced, highlighting the significance of understanding these feedback mechanisms for accurate projections of peatland methane flux under climate warming.
JOURNAL OF HYDROLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yang Wu, Mingyu Wu, Juncheng Zhu, Xiaojing Zhang, Jing Li, Kai Zheng, Jun Hu, Chengyuan Liu, Yang Pan, Junfa Zhu, Yongfu Sun, Yi Xie
Summary: Spatially-separated redox sites on two-dimensional heterostructured nanosheets with loaded metal oxides enable high selectivity and reactivity of CO2 photoreduction to CH4 under atmospheric conditions. The designed nanosheets achieved nearly 100% selectivity, ultralong stability of 240 hours, and CO2 conversion of 48.2%. This study presents a new approach towards efficient oxidation and reduction of CO2 photocatalysis to CH4 by designing photocatalysts with spatially-separated redox sites.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Energy & Fuels
Guenther Glatz, Saad Alafnan, Raoof Gholami, Arshad Raza, Mohamed Mahmoud, Khaled Al-Azani, Abeeb Awotunde
Summary: This study investigates the adsorption characteristics of shale under various pressure and temperature conditions and evaluates the predictive power of different theoretical adsorption models. The results suggest that the Langmuir, Toth, and Langmuir-Freundlich models are suitable for single component adsorption, while the Toth and LRC models are capable of capturing acceptable binary adsorption behavior.
Article
Agriculture, Multidisciplinary
Haoyu Qian, Jin Chen, Xiangchen Zhu, Ling Wang, Yunlong Liu, Jun Zhang, Aixing Deng, Zhenwei Song, Yanfeng Ding, Yu Jiang, Kees Jan van Groenigen, Weijian Zhang
Summary: Atmospheric CO2 concentrations and water management practices both affect greenhouse gas emissions from rice paddies. This study found that elevated CO2 levels increased methane emissions under continuously flooded irrigation conditions, but had no effect under intermittently flooded conditions. Elevated CO2 had no effect on N2O emissions. Rice biomass and yield increased with elevated CO2, but were not affected by water management. These findings highlight the importance of considering changes in water management when estimating methane emissions from global rice agriculture.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2022)
Article
Plant Sciences
Anastasiia Kryvenda, Rudolf Tischner, Bastian Steudel, Carola Griehl, Robert Armon, Thomas Friedl
Summary: Green algae isolated from different terrestrial environments have a strong tolerance to high concentrations of CO2 and can efficiently produce biomass rich in valuable compounds. This discovery enables the economic and sustainable production of valuable compounds from these green algae using inexpensive sources of high CO2 concentrations, such as industrial exhaust fumes.
Article
Chemistry, Inorganic & Nuclear
Dan Liang, Yunfeng Hu, Qiang Bao, Jian Zhang, Jiawei Feng, Penglai Sun, Yutong Ma, Hongsheng Zhang
Summary: Rho zeolite with different cations exchanged was successfully synthesized, with Cd-Rho showing the best adsorption performance for CO2, high CO2/CH4 selectivity, and capacity. The introduction of Cd2+ and Pb2+ can significantly reduce pore size, restrict CH4 entry, and improve CO2/CH4 selectivity.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Geosciences, Multidisciplinary
Pei Xue, Quansheng Liang, Chao Gao, Jintao Yin, Shiyan Hao, Qianping Zhao
Summary: In order to explain the difference in adsorption characteristics of CH4 and CO2 on continental shale from the perspective of thermodynamics, isothermal adsorption experiments were conducted on shale in Yanchang Formation in Ordos Basin. The results showed that the isosteric heat of adsorption of CH4 is greater than that of CO2, indicating a stronger adsorption force for CH4 on Yanchang Formation shale.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Thermodynamics
Xing Li, Shengrong Xie, Jing Zhang, Tao Li, Xiaohan Wang
Summary: The experimental study compared the combustion characteristics of CH4/CO2 and CH4/N-2 non-premixed jet flames, showing that CO2 dilution leads to higher lift-off heights and lower blowout limits in turbulent flames. Additionally, elevated air temperature significantly increases the range of stable lifted flames. Pre-mixed flame models were used to analyze liftoff heights and blowout velocities, revealing a linear relationship between non-dimensional liftoff height and fuel jet velocity, as well as between non-dimensional blowout velocity and Reynolds number.
Article
Geosciences, Multidisciplinary
J. Ben Keane, Iain P. Hartley, Christopher R. Taylor, Jonathan R. Leake, Marcel R. Hoosbeek, Franco Miglietta, Gareth K. Phoenix
Summary: Increasing atmospheric CO2 enhances plant productivity, but nitrogen and phosphorus limitation can constrain plant responses to elevated CO2. In an experiment conducted in the Peak District National Park, grasslands with contrasting levels of phosphorus limitation showed different productivity responses to elevated CO2, with competition between plants and microbes for phosphorus playing a key role.
Article
Ecology
Yongxin Lin, Guiping Ye, Hang-Wei Hu, Ping Yang, Song Wan, Mengmeng Feng, Zi-Yang He, Ji-Zheng He
Summary: This study investigated the impact of plant species on the abundance, diversity, and community structure of comammox Nitrospira. The findings revealed that plant species play a critical role in driving the distribution of comammox Nitrospira, with different plant species influencing different clades of comammox Nitrospira. Additionally, plant invasion can alter the community structure of comammox Nitrospira. Soil depth also has some influence on the community structure of comammox Nitrospira, although weaker than the effect of plant species.
Review
Environmental Sciences
Chaoyu Li, Zi-Yang He, Hang-Wei Hu, Ji-Zheng He
Summary: This review summarizes the recent findings on the biogeographical distribution and ecological preference of comammox Nitrospira in soil, as well as their responses to nitrogen application and ecological niche in the habitat. The studies suggest that comammox Nitrospira are not strictly oligotrophic but also have a broader ecological niche breadth.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Agriculture, Multidisciplinary
Yalan Tian, Ping Yang, Hong Yang, Huimin Wang, Linhai Zhang, Chuan Tong, Derrick Y. F. Lai, Yongxin Lin, Lishan Tan, Yan Hong, Chen Tang, Kam W. Tang
Summary: Emissions of nitrous oxide (N2O) from aquaculture, particularly in China, are poorly understood. This study investigated N2O dynamics in aquaculture ponds in southeastern China and found that the water column and sediment contribute differently to N2O production and emission. The study estimates that China's coastal aquacultural ponds emit a relatively small amount of N2O compared to other aquaculture operations.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2023)
Article
Engineering, Environmental
Li Bi, Li-Li Han, Shuai Du, Dan-Ting Yu, Ji-Zheng He, Li-Mei Zhang, Hang-Wei Hu
Summary: Viruses can influence the composition and functions of host communities, as well as enhance host pathogenicity by transporting virus-encoded virulence genes. The contribution of viral communities to the dissemination of virulence genes across various biomes is largely unknown. In this study, we identified a wide variety of virulence genes in soil viruses, suggesting their potential role in driving the pathogenesis of their hosts in terrestrial ecosystems.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Quan-Cheng Wang, Sheng-Sheng Jin, Shanshan Liu, Ge Song, Chunjian Duan, Peng-Peng Lue, Pulak Maitra, Lin Xie, Yongxin Lin, Hang-Wei Hu, Ji-Zheng He, Yong Zheng
Summary: Nitrogen and phosphorus amendments have significant effects on fungal diversity and community composition, but their impacts on arbuscular mycorrhizal fungal communities in forest soil are still unclear.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Environmental Sciences
Peixin Ren, Anqi Sun, Xiaoyan Jiao, Ju-Pei Shen, Dan-Ting Yu, Fangfang Li, Bingxue Wu, Ji-Zheng He, Hang-Wei Hu
Summary: Soil-borne fungal pathogens are a major threat to global agricultural production and food security. This study investigates the impact of agricultural management practices on the relative importance of protists and bacteria in plant disease suppression. The results show that organic fertilization regimes significantly decrease the abundance of fungal pathogens and alter the community composition of these pathogens compared to inorganic fertilization regimes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yongxin Lin, Hang-Wei Hu, Milin Deng, Ping Yang, Guiping Ye
Summary: This study investigated the abundance, community structure, and co-occurrence network of nosZ I and nosZ II carrying microorganisms in a subtropical coastal wetland. The results showed that nosZ I and nosZ II carrying microorganisms differed in taxonomic identities and were positively associated with salinity, total carbon, and total nitrogen. The study also found that nosZ I and nosZ II likely shared similar ecological niches based on the co-occurrence analysis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Soil Science
Song Wan, Yongxin Lin, Jianbo Fan, Hang-Wei Hu, Jinbo Zhang, Sheng-Sheng Jin, Milin Deng, Christoph Mueller, Ji-Zheng He
Summary: Long-term lime and manure amendment can have different impacts on N2O emissions due to their differential effects on autotrophic and heterotrophic nitrification. Lime amendment increased N2O emissions by promoting autotrophic nitrification, while manure amendment decreased N2O emissions by reducing both heterotrophic and autotrophic nitrification. These results provide important insights for the sustainable management of acidic arable soils.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Environmental Sciences
Thi Bao Anh Nguyen, Qing-Lin Chen, Zhen-Zhen Yan, Chaoyu Li, Ji-Zheng He, Hang-Wei Hu
Summary: Protists play important roles in soil food webs by decomposing organic matter and cycling biogeochemical elements. Bacterial and invertebrate diversity are important factors driving the diversity of protists. Bacteria and fungi have a stronger influence on the taxonomic and functional composition of protists than soil invertebrates.
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2023)
Correction
Multidisciplinary Sciences
Yu-Rong Liu, Marcel G. A. van der Heijden, Judith Riedo, Carlos Sanz-Lazaro, David J. J. Eldridge, Felipe Bastida, Eduardo Moreno-Jimenez, Xin-Quan Zhou, Hang-Wei Hu, Ji-Zheng He, Jose L. Moreno, Sebastian Abades, Fernando Alfaro, Adebola R. R. Bamigboye, Miguel Berdugo, Jose L. Blanco-Pastor, Asuncion de los Rios, Jorge Duran, Tine Grebenc, Javier G. G. Illan, Thulani P. P. Makhalanyane, Marco A. A. Molina-Montenegro, Tina U. U. Nahberger, Gabriel F. F. Penaloza-Bojaca, Cesar Plaza, Ana Rey, Alexandra Rodriguez, Christina Siebe, Alberto L. L. Teixido, Nuria Casado-Coy, Pankaj Trivedi, Cristian Torres-Diaz, Jay Prakash Verma, Arpan Mukherjee, Xiao-Min Zeng, Ling Wang, Jianyong Wang, Eli Zaady, Xiaobing Zhou, Qiaoyun Huang, Wenfeng Tan, Yong-Guan Zhu, Matthias C. C. Rillig, Manuel Delgado-Baquerizo
NATURE COMMUNICATIONS
(2023)
Editorial Material
Microbiology
Yongxin Lin, Hang-Wei Hu, Gui-Feng Gao, Yanjiang Cai
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Microbiology
Zahra F. Islam, Pavel V. Cherepanov, Hang-Wei Hu
Summary: With the pressures of a changing global climate and ever-growing population, the need for sustainable agricultural practices is critical. The next generation of enhanced efficiency fertilisers that combine chemical, materials engineering and biological components are likely to be a game changer. This perspective proposes novel, interdisciplinary strategies to generate highly efficient, biodegradable fertiliser coatings for use in the agricultural sector.
MICROBIOLOGY AUSTRALIA
(2023)
Article
Geosciences, Multidisciplinary
Jeongeun Yun, Yerang Yang, Xue Zhou, Jaehyun Lee, Jiwon Choi, Mincheol Kim, Hyeryeon Gyeong, Dominique Laffly, Hojeong Kang
Summary: Climate warming has accelerated deglaciation in the Svalbard high Arctic region, resulting in significant landscape transformations. This leads to the expansion of exposed soil surfaces, providing new habitats for plants and microorganisms and contributing to ecosystem succession. While there has been extensive research on the primary succession of plant communities following glacier retreat, microbial succession, particularly that of methanotrophs and methanogens, is still poorly understood. In this study, we investigated the abundance and diversity of methanotrophs and methanogens along a 100-year soil chronosequence in the forelands of inland and tidewater glaciers in Svalbard. Our findings revealed clear trends in the structure of methanotrophic communities during the deglaciation process in both glacier types, mediated by changes in soil physicochemical properties. These insights significantly contribute to our understanding of microbial dynamics during deglaciation and their implications for methane dynamics in the high Arctic.
Article
Microbiology
Bingxue Wu, Xiaoyan Jiao, Anqi Sun, Fangfang Li, Ji-Zheng He, Hang-Wei Hu
Summary: Soil invertebrates in agricultural systems are influenced by precipitation seasonality and soil pH, and future climate change and agricultural practices may have significant effects on their distribution.
FEMS MICROBIOLOGY ECOLOGY
(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.