Article
Environmental Sciences
Jing Liu, Airong Liu, Jie Guo, Tao Zhou, Wei-xian Zhang
Summary: Modifications using different types of polyacrylamide (PAM) enhanced the sedimentation efficiency of nano zero-valent iron (nZVI) in a nano-iron reactor, improving processing capacity and maintaining reactivity for a longer period in wastewater treatment.
Article
Biophysics
Pengcheng Jing, Lei Peng, Nan Xu, Yifei Feng, Xia Liu
Summary: Green synthesized nano-zero-valent iron (GT-nZVI) has been shown to be an excellent material for in-situ soil remediation due to its stability and environmental friendliness. The transportability of GT-nZVI is affected by soil components (bacteria and phosphate), and phosphate can enhance the co-transport of GT-nZVI with bacteria at pH 6.0 but reduce its mobility at pH 8.0 due to cell-cell interactions. This study highlights the importance of considering surface property changes in complex environments for effective in-situ remediation.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Engineering, Environmental
Mingyang Song, Xiaolei Hu, Tianhang Gu, Wei-xian Zhang, Zilong Deng
Summary: In this study, a nanocellulose-based composite, NC-nZVI, was developed for efficient removal of nickel. The nZVI was anchored to nanocellulose through a liquid-phase reduction method, resulting in varied morphology and dispersion status. Among the developed composites, CNC-nZVI showed the most evenly distributed nZVI particles. The binding between NC and nZVI was achieved through hydrogen bonds, electrostatic attractions, coordination-covalent bonds, and steric hindrance. The CNC-nZVI composite exhibited significantly higher removal efficiency of Ni2+ compared to bare nZVI, and remained effective under a wide pH range and in the presence of interference ions like NO3-, Cl-, and Ca2+. The observed hollow-out structure and Tafel extrapolation curves indicated that CNC activated diffusion path and accelerated electronic transfer from nZVI. The superior removal performance of NC-nZVI and the abundance of raw materials make it a promising material for environmental remediation and wastewater treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Jian Wang, Congcong Liu, Hongwei Sun, Shaohui Wang, Xiaomei Liao, Lizhi Zhang
Summary: The study reveals that nanoscale zero-valent iron (nZVI) causes an increase in intracellular iron concentrations, leading to the production of high levels of endogenous reactive oxygen species (ROSs) and the oxidative damage of DNA, resulting in the inactivation of E. coli cells. The close contact between nZVI and E. coli leads to increased permeabilization of the cytomembrane and iron overload, which enhances the efficiency of E. coli inactivation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yilong Hua, Wei Wang, Nan Hu, Tianhang Gu, Lan Ling, Wei-xian Zhang
Summary: The core-shell structure of nanoscale zero-valent iron (nZVI) has been shown to provide multiplex solution and surface chemistry for reliable and high-efficiency enrichment and separation of uranium from low-level sources. Treatment of uranium-tailings wastewater in continuous-flow reactors resulted in reacted nZVI with high uranium content and treated wastewater with significantly reduced uranium concentration. This research further supports the cost-effective use of nanotechnology for pollution control and resource recovery.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Chemistry, Physical
Jinglin Ding, Weihua Xu, Shaobo Liu, Yunguo Liu, Xiaofei Tan, Xin Li, Zhongwu Li, Peng Zhang, Li Du, Meifang Li
Summary: In this study, biochar was pyrolyzed with potassium ferrate to achieve porosity, graphitization, and iron doping simultaneously, resulting in the synthesis of nanoscale zero-valent iron loaded porous graphitized biochar. The nZVI/PGBC showed superior efficiency in removing 17 beta-estradiol compared to other materials, and the removal efficiency was affected by reaction conditions. The reaction mechanism involved the activation of persulfate by Fe2+ and Fe3+ redox reactions, with PGBC acting as a carrier for nZVI and a mediator for electron transfer in E2 degradation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Chao Gao, Jixue Sui, Kang Chen, Zongyuan Chen, Wangsuo Wu, Zhijun Guo
Summary: The study demonstrates that nZVI can effectively remove U(VI) from strongly alkaline solutions in anaerobic conditions, with a reduction efficiency of up to 95.5%, but the efficiency drops significantly in aerobic conditions due to oxidation and desorption processes. This offers new insights into the mechanisms of U(VI) interactions with nZVI in alkaline media and provides a potential approach for uranium recovery from spent nZVI.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Thunyalux Ratpukdi, Katika Intarasuwan, Panitan Jutaporn, Eakalak Khan
Summary: This study investigated the interactions between different NOM fractions and NZVI, finding that HPOA of GWNOM and HPIA of SRNOM exhibited the highest adsorption capacities. Bulk NOM fractionation after reaction with NZVI indicated that NOM not only adsorbed on NZVI, but also reacted and transformed into more hydrophilic and neutral compounds. This work sheds light on the reactivity between NOM and NZVI.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Tingting Yue, Yuankun Yang, Shu Chen, Jun Yao, Huili Liang, Liang Jia, Kaibin Fu, Zhe Wang
Summary: In this study, a novel composite of Chlorella vulgaris-supported nanoscale zero-valent iron (CV-nZVI) was reported for efficient removal of As(III) from contaminated water. The stabilization effect of C. vulgaris reduced the agglomeration of nZVI and enhanced its reactivity. The CV-nZVI showed a removal efficiency of 99.11% for As(III) at an optimal pH of 7.0, and exhibited reusability and regeneration capabilities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Qi Cheng, Qingrui Li, Xiaojie Huang, Xiaoqin Li, Yunyan Wang, Weizhen Liu, Zhang Lin
Summary: In this study, cauliflower-like amorphous nanoscale zero-valent iron (A-nZVI) was prepared and found to have better performance for the removal of Sb(III) compared to nZVI. A-nZVI showed higher removal capacity and selectivity for Sb(III) and was less affected by interfering anions. The findings contribute to the remediation of Sb(III) in groundwater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Ghulam Hussain Qasim, Hasan Fareed, Mijin Lee, Woojin Lee, Seunghee Han
Summary: A Fenton-like reaction activated by nanoscale zero-valent iron (nZVI) was proposed for the decomposition of aqueous monomethylmercury (MMHg). The reaction efficiently removed MMHg with the main product being Hg(II). Furthermore, the reduction of Hg(II) by magnetite on the nZVI surface was found to enhance the removal of MMHg.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Ecology
Rong Cheng, Ya-ping Liu, Yi-hui Chen, Liang-jie Shen, Jiao-jiao Wu, Lei Shi, Xiang Zheng
Summary: This study investigated the combined effects of nZVI and LAS on the freshwater algae Scenedesmus obliquus, revealing synergistic, additive, and antagonistic effects at different toxic ratios. Additionally, the chlorophyll content in the algae decreased with increasing mixture dose, while protein levels remained relatively unchanged.
Article
Environmental Sciences
Chunxia Ding, Wei-ai Zeng, A-juan Zhao, Mengyun Yang, Yanlan Xie, Yaocheng Deng, Daoxin Gong, Meizheng Duan, Hailin Cai, Pengfei Xie, Yong Zhou, Zhiyong Wen
Summary: Nanoscale zero-valent iron particles loaded on montmorillonite (nZVI/Mt) were synthesized for effective removal of thiamethoxam, with the reaction conditions optimized through response surface methodology. The removal efficiency of thiamethoxam reached 94.29% under the optimal conditions, and the degradation mechanism involved reduction and elimination of the -NO2 group on the thiamethoxam molecule by nZVI/Mt.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Chia -Chang Lin, Ya -Jung Cheng
Summary: This study shows that the use of nZVI and H2O2 can effectively degrade sulfamethazine in water, with optimal degradation efficiency at pH 3. Increasing nZVI dosage and decreasing initial sulfamethazine concentration can enhance the degradation efficiency.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Environmental Sciences
Jun Ren, Xuan Mi, Ling Tao
Summary: The study demonstrated that PAL-nZVI effectively reduced the bioavailability and mobility of Cd in soils, showing superior stabilization effects in Cd-contaminated soils compared to using nZVI alone. This material has the potential for effective remediation of Cd-contaminated soils with high and valuable utilization in field applications.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Geochemistry & Geophysics
Sebastian Viehmann, Robert Kujawa, Simon V. Hohl, Nathalie Tepe, Alexandra S. Rodler, Thilo Hofmann, Erich Draganits
Summary: Stromatolitic carbonates from the Oberpullendorf Basin in Austria provide a valuable opportunity to study the evolution of microbial habitats during the Badenian Salinity Crisis. Geochemical data of the carbonates show that variations in environmental conditions within the basin coincide with microbialite morphologies. Post-depositional alteration processes affected the carbonate samples to different degrees.
Article
Engineering, Environmental
Stephanie Castan, Anya Sherman, Ruoting Peng, Michael T. Zumstein, Wolfgang Wanek, Thorsten Hueffer, Thilo Hofmann
Summary: This study found that tire wear particle-derived compounds can be absorbed by lettuce and transformed into more stable compounds in the plant. Furthermore, continuous tire wear leads to a resupply and replenishment of these compounds in the lettuce leaves. This is an important aspect for the impact assessment of tire wear in the environment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Meiling Zhu, Zhanhua Zhang, Tong Zhang, Thilo Hofmann, Wei Chen
Summary: Nanoplastics are a growing environmental concern due to their ability to acquire an eco-corona in aquatic environments. The properties of the eco-corona and its impact on nanoplastics transport vary with the surface functionality of nanoplastics and sources of macromolecules. The eco-corona inhibits the deposition of nanoplastics mainly through steric repulsion, and a higher mass of larger-sized macromolecules results in greater transport enhancement.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Miroslav Brumovsky, Vesna Micic, Jana Oborna, Jan Filip, Thilo Hofmann, Daniel Tunega
Summary: This study investigated the performance of iron nitride nanoparticles in dechlorination of chlorinated ethene compounds and found that they exhibited higher dechlorination rates compared to sulfidated nanoscale zero-valent iron particles.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Helene Walch, Antonia Praetorius, Frank von der Kammer, Thilo Hofmann
Summary: Aquatic fate models and risk assessment require experimental information on the potential of contaminants to interact with riverine suspended particulate matter (SPM). However, the assumption of chemical equilibrium is invalid for particulate contaminants, and their interactions with SPM are governed by physicochemical forces between contaminant-particle and SPM surfaces. Therefore, the availability of a standard SPM material is highly relevant for the development of reproducible test systems to evaluate the fate of particulate contaminants in aquatic systems.
Article
Multidisciplinary Sciences
Miguel Angel Marazuela, Martin Stockhausen, Thilo Hofmann
Summary: The increasing use of gadolinium-based contrast agents in magnetic resonance imaging and the recalcitrant behavior of gadolinium during municipal wastewater treatment have led to increased concentrations of the tracer in aquatic environments. Direct measurement of gadolinium is complex and costly, making its practical use limited.
Article
Environmental Sciences
Miguel Angel Marazuela, Giovanni Formentin, Klaus Erlmeier, Thilo Hofmann
Summary: Aquifers providing drinking water are at risk of contamination from wastewater inputs. This study investigates the use of the sweetener acesulfame potassium as a tracer for wastewater inputs to riverbank filtration sites. The study found that acesulfame potassium concentrations varied seasonally, allowing the identification and characterization of different sources of wastewater inputs to the aquifer. The findings highlight the importance of individually assessing the locations of riverbank infiltration to ensure the safety of drinking water.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Carlotta Carlini, Sampriti Chaudhuri, Oliver Mann, Daniel Tomsik, Thorsten Hueffer, Nicolas Greggio, Diego Marazza, Thilo Hofmann, Gabriel Sigmund
Summary: Biochar has been proven to immobilize polycyclic aromatic hydrocarbons (PAH) and hetero-PAH in residually contaminated soils, and performs better than commercial activated carbon (AC). Steam-activated biochar (SABC) showed higher efficacy than AC, while pristine biochar (BC) had slightly lower performance but was still acceptable. Therefore, BC and SABC can be valid substitutes for AC in stabilizing residually contaminated soils.
ENVIRONMENTAL POLLUTION
(2023)
Article
Biodiversity Conservation
Gabriel Sigmund, Marlene Agerstrand, Alexandre Antonelli, Thomas Backhaus, Tomas Brodin, Miriam L. Diamond, Walter R. Erdelen, David C. Evers, Thilo Hofmann, Thorsten Hueffer, Adelene Lai, Joao P. M. Torres, Leonie Mueller, Allison L. Perrigo, Matthias C. Rillig, Andreas Schaeffer, Martin Scheringer, Kristin Schirmer, Ahmed Tlili, Anna Soehl, Rita Triebskorn, Penny Vlahos, Colette vom Berg, Zhanyun Wang, Ksenia J. Groh
Summary: Climate change, biodiversity loss, and chemical pollution are urgent global emergencies that require immediate actions to mitigate. While climate change and biodiversity are often studied together, chemical pollution's contribution to biodiversity loss has been largely overlooked. Failure to address pollution effects may undermine biodiversity protection efforts, highlighting the importance of interdisciplinary collaborations in understanding and countering the negative impact of chemical pollution on ecosystems.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Engineering, Environmental
Miguel Angel Marazuela, Giovanni Formentin, Klaus Erlmeier, Thilo Hofmann
Summary: This study assessed the persistence of the artificial sweetener acesulfame potassium (ACE) in wastewater treatment and the aquatic environment, and found it to be a useful tracer for wastewater inputs. ACE concentration was also found to be influenced by temperature, with higher concentrations observed in the cold season compared to the warm season.
Article
Computer Science, Software Engineering
Laura Lotteraner, Thilo Hofmann, Torsten Moeller
Summary: This design study presents an analysis and abstraction of temporal and spatial data and workflows in hydrogeology, along with the development of an interactive visualization prototype. The interface, developed in collaboration with hydrogeological researchers, facilitates data exploration, selection for model calibration, and communication of findings to industry partners. The study emphasizes the importance of rapid prototyping and the impact of seeing one's own data on user engagement. It also highlights that the design and validation process itself aids domain scientists in understanding their data's potential and challenges more than the final interface prototype.
IEEE COMPUTER GRAPHICS AND APPLICATIONS
(2023)
Article
Engineering, Environmental
Wendel Wohlleben, Markus Rueckel, Lars Meyer, Patrizia Pfohl, Glauco Battagliarin, Thorsten Hueffer, Michael Zumstein, Thilo Hofmann
Summary: Compostable plastics, when added into composting, undergo disintegration under industrial composting conditions. Fragmentation peaks were observed, with 25-75 μm size fragments reaching the highest peak after only one week. Larger fragments peaked earlier, while smaller ones peaked later and were less frequent. Depolymerization was identified as the main driving force for disintegration, and there was no accumulation of particulate fragments of any size.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Review
Environmental Sciences
Thilo Hofmann, Subhasis Ghoshal, Nathalie Tufenkji, Jan Franklin Adamowski, Stephane Bayen, Qiqing Chen, Philip Demokritou, Markus Flury, Thorsten Hueffer, Natalia P. Ivleva, Rong Ji, Richard L. Leask, Milan Maric, Denise M. Mitrano, Michael Sander, Sabine Pahl, Matthias C. Rillig, Tony R. Walker, Jason C. White, Kevin J. Wilkinson
Summary: Plastics have been widely used in agriculture, but their accumulation in soils has become a major issue. Controlling plastic pollution in agriculture requires rational use, reduction, collection, and innovative recycling. Sustainable alternatives with smaller environmental impacts should be promoted, along with better monitoring, technical innovation, education, and economic incentives.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Helene Walch, Nada Basic, Antonia Praetorius, Frank von der Kammer, Thilo Hofmann
Summary: Engineered and incidental nanomaterials are emerging contaminants of environmental concern. This study introduces a new versatile test system to determine heteroagglomeration attachment efficiency (αhet) under environmentally relevant conditions. The importance of this research lies in providing the comparability of environmental fate studies and environmental risk assessment of nanomaterials.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Geography, Physical
Thomas O. Hoffmann, Yannik Baulig, Stefan Vollmer, Jan H. Bloethe, Karl Auerswald, Peter Fiener
Summary: This study conducted a trend analysis of suspended sediments in 62 monitoring stations along the German waterways and found significant declines in annual suspended sediment concentration and loads. Despite an increase in land erosion, the suspended sediment loads decreased. It is speculated that increased sediment retention in upstream headwaters is the main reason for the decline in suspended sediment concentration.
EARTH SURFACE DYNAMICS
(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.
