Review
Food Science & Technology
Alexandra Costina Avirvarei, Liana Claudia Salanta, Carmen Rodica Pop, Elena Mudura, Antonella Pasqualone, Ofelia Anjos, Natalia Barboza, Jessie Usaga, Cosmin Pompei Darab, Cristina Burja-Udrea, Haifeng Zhao, Anca Corina Farcas, Teodora Emilia Coldea
Summary: The importance of food and beverage safety is crucial due to globalization and consumer demands. This review critically analyzes the presence of hazards and potential formation of toxic compounds in fruit-based fermented beverages. Techniques such as microbial fermentation and mycotoxin oxidation can help reduce or eliminate contaminants and ensure the safety of these beverages.
Review
Chemistry, Multidisciplinary
Shubhrima Ghosh, Razi Ahmad, Md. Zeyaullah, Sunil Kumar Khare
Summary: Nanomaterials have diverse applications in biology, medicine, electronics, and agriculture. Biological synthesis methods can overcome limitations of chemical and physical methods, and microbial nanoparticles play a significant role in biomedical applications but face challenges such as biocompatibility and stability.
FRONTIERS IN CHEMISTRY
(2021)
Article
Biotechnology & Applied Microbiology
Dig Vijay Singh, Rouf Ahmad Bhat, Atul Kumar Upadhyay, Ranjan Singh, D. P. Singh
Summary: Water pollution is a serious concern globally, with direct discharge of wastewater posing risks to aquatic ecosystems. Microalgae have been found to be an efficient and ecofriendly technique for purifying water environments.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Environmental Sciences
Ming Du, Minggang Zheng, Aifeng Liu, Ling Wang, Xin Pan, Jun Liu, Xiangbin Ran
Summary: This study investigated the combined effects of emerging contaminants (ECs) and heavy metals (HMs) on microbial communities in estuarine sediments around the Bohai Sea. The results showed that the concentration of pollutants affected the abundance of certain bacteria, which can serve as potential contamination indicators. There were differences in the richness and diversity of bacterial communities in sediments from different rivers. The bacterial community composition in estuarine sediments in Liaoning province was found to be more similar to each other.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Julia Hartmann, Juan Carlos Chacon-Hurtado, Eric Verbruggen, Jack Schijven, Emiel Rorije, Susanne Wuijts, Ana Maria de Roda Husman, Jan Peter van der Hoek, Lisa Scholten
Summary: This study aims to establish an assessment hierarchy and develop a decision support tool for quantifying (uncertain) risk scores of emerging chemical and microbial contaminants in drinking water. By using a multi-actor approach and the concept of value-focused thinking, uncertainties in risk evaluation and prioritization approaches are addressed to effectively protect public health from emerging drinking water risks.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Andrew Power, Philip White, Brendan McHugh, Evin McGovern, Sinead Murphy, Simon Berrow, Moira Schlingermann, Cillian Gately, Marissa Tannian, Stephen Newton, Denis Crowley, Linda O'Hea, Brian Boyle, Ian O'Connor
Summary: This study analyzed Guillemot eggs from different colonies in Ireland and Wales, finding varying levels of pollutants in different regions. Guillemot eggs from Aughris Head (Atlantic west coast of Ireland) had the lowest pollutant levels, while eggs from Skomer Island (Wales) had the highest levels of pollutants.
Article
Engineering, Environmental
Alyssa Azaroff, Mathilde Monperrus, Carole Miossec, Claire Gassie, Remy Guyoneaud
Summary: This study investigated the degradation potential of synthetic musks, UV filters, and a pharmaceutical compound in marine sediment samples under laboratory conditions. The results showed different half-life times for the contaminants under biotic conditions, with limitations observed in degradation under anoxic conditions compared to oxic conditions. Novel aerobic bacteria capable of degrading these contaminants were successfully isolated, potentially aiding in remediation processes in marine environments.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Environmental Sciences
Haozheng He, Yiyang Li, Rui Shen, Hojae Shim, Yanhong Zeng, Siyan Zhao, Qihong Lu, Bixian Mai, Shanquan Wang
Summary: New organohalides have replaced old ones, leading to their widespread environmental distribution. These compounds are found in both abiotic and biotic matrices, requiring control measures. Remediation techniques such as photodegradation, chemical oxidation, and biodegradation are discussed, with microbial reductive dehalogenation representing a promising method for removal.
ENVIRONMENTAL POLLUTION
(2021)
Article
Green & Sustainable Science & Technology
Mehak Nawaz Khan, Hidayat Ullah, Sundas Naeem, Jalal Uddin, Yasir Hamid, Waqar Ahmad, Jia Ding
Summary: The research utilized activated biochar produced from wheat straw using chemical oxidation as a natural adsorbent to remediate heavy metal contamination in water. The study showed that the biochar had maximum adsorption efficiency for cadmium and lead at neutral pH, with adsorption capacities of 8.85 and 9.03 mg/g, respectively. Adsorption data followed Langmuir model and pseudo 2nd order kinetics model, indicating a monolayer adsorption and chemisorption nature. Thermodynamic study revealed different processes for Cd and Pb adsorption.
Review
Chemistry, Multidisciplinary
Cindy Ka Y. Law, Luiza Bonin, Bart De Gusseme, Nico Boon, Kankana Kundu
Summary: The production of biogenic palladium nanoparticles using environmentally friendly methods has great potential for various applications, such as reductive bioremediation and microbial fuel cells. Understanding the production pathway and optimizing its catalytic properties are important for further research and utilization.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Environmental Sciences
Ravinder Kumar, Anna Whelan, Patrick Cannon, Madoc Sheehan, Louise Reeves, Elsa Antunes
Summary: This study aimed to quantify different classes of emerging contaminants in biosolids from sewage treatment plants (STPs) across Northern Queensland, Australia. Significant variations were found in the concentrations of different contaminants, which could be explained by the characteristics of the upstream sewage network. Certain contaminants, such as heavy metals, antibiotics, PFOS, and PFOA, were identified as posing high environmental risks.
ENVIRONMENTAL POLLUTION
(2023)
Review
Environmental Sciences
James O'Connor, Bede S. Mickan, Kadambot H. M. Siddique, Jorg Rinklebe, M. B. Kirkham, Nanthi S. Bolan
Summary: Utilizing food waste as biofertilizers can help reduce environmental and economic issues, but may bring about problems with contaminants. More research is needed to reduce contaminants in composts and digestates, and examining emerging contaminants in food-waste composts and digestates is crucial for food security and reducing human health risks.
ENVIRONMENTAL POLLUTION
(2022)
Review
Engineering, Environmental
Narayanan Mahesh, Srinivasan Balakumar, Uthaman Danya, Shanmugasundaram Shyamalagowri, Palanisamy Suresh Babu, Jeyaseelan Aravind, Murugesan Kamaraj, Muthusamy Govarthanan
Summary: The management and mitigation of emerging contaminants and pollutants in the environment through bioresources is a growing focus of research. Various strategies can be combined with existing remediation technologies to effectively eliminate emerging contaminants from the environment. Among these strategies, the use of microbial bio-machines is prioritized due to its renewable and eco-friendly approach. This review examines the impacts of emerging contaminants on humans and ecosystems, the use of microbial bio-machines for handling these contaminants in water environments, and the challenges and advantages of this approach.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
S. M. Sathe, Indrajit Chakraborty, B. K. Dubey, M. M. Ghangrekar
Summary: Urbanization and industrialization have led to an increase in emerging contaminants in water bodies, and the coupling of Fenton oxidation with microbial fuel cells can effectively degrade these pollutants, reducing costs and saving energy.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Rui Chen, Han Zhang, Jinlong Wang, Daliang Xu, Xiaobin Tang, Weijia Gong, Heng Liang
Summary: This study proposes a water purification technology that combines biogenic manganese oxides in the biofouling layer with gravity-driven membrane filtration, which effectively removes pollutants from water and ensures water safety in rural areas.
Article
Environmental Sciences
Cindy Ka Y. Law, Kankana Kundu, Luiza Bonin, Lorena Penacoba-Antona, Eduardo Bolea-Fernandez, Frank Vanhaecke, Korneel Rabaey, Abraham Esteve-Nunez, Bart De Gusseme, Nico Boon
Summary: In this study, biogenic palladium nanoparticles were used for the reductive transformation and/or dehalogenation of persistent micropollutants. The size of the nanoparticles and their catalytic activity could be controlled by adjusting the H-2 flow rate. The results showed that the nanoparticles with larger sizes exhibited higher catalytic activity and more efficient removal of micropollutants.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Cindy Ka Y. Law, Eduardo Bolea-Fernandez, Tong Liu, Luiza Bonin, Elien Wallaert, Kim Verbeken, Bart De Gusseme, Frank Vanhaecke, Nico Boon
Summary: This study investigates the formation process of biogenic palladium nanoparticles using various techniques. The distribution of palladium over cells is strongly dependent on Pd2+ concentration, biomass, and partial H-2 pressure. Additionally, cell density and H-2 partial pressure significantly affect the size of the nanoparticles.
MICROBIAL BIOTECHNOLOGY
(2023)
Article
Engineering, Environmental
Kristel Mijnendonckx, Tom Rogiers, Francisco J. Gimenez del Rey, Mohamed L. Merroun, Adam Williamson, Md Muntasir Ali, Daniel Charlier, Natalie Leys, Nico Boon, Rob Van Houdt
Summary: Uranium contamination is a widespread issue caused by natural and human activities. However, the molecular mechanisms underlying uranium resistance in bacteria are still not well understood. This study investigated the resistance mechanisms of Cupriavidus metallidurans NA4 to toxic uranium concentrations. Through the increased expression of a specific small periplasmic protein, PrsQ2, the bacteria were able to form periplasmic uranium-phosphate precipitates, thus improving their resistance to uranium.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Robin Depraetere, Wim De Waele, Margo Cauwels, Tom Depover, Kim Verbeken, Matthieu Boone, Stijn Hertele
Summary: An experimental study was conducted to investigate the plastic anisotropy and ductile fracture behavior of API 5L X70 pipeline steel with and without hydrogen charging. The presence of hydrogen was found to accelerate ductile damage development and fracture, especially under higher stress triaxiality. These results are important for the development of numerical models to describe hydrogen embrittlement in high-strength low-alloy steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Simon Vander Vennet, Kim Verbeken, Tom Depover
Summary: A numerical solution of Fick's second law in one dimension with experimentally determined diffusion coefficients at different constant loads is combined with slow strain rate tensile tests and subsequent fractography on dual-phase steel. The depth of the hydrogen embrittled region is determined and correlated to concentration profiles determined by the numerical model. Incorporating stress dependency of the diffusion coefficient results in different concentration profiles compared to using a constant diffusivity, allowing for more accurate determination of a critical local hydrogen concentration based on the total diffusible hydrogen concentration at saturation.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Engineering, Environmental
Paula Alejandra Lamprea Pineda, Kristof Demeestere, Manuel Toledo, Nico Boon, Herman Van Langenhove, Christophe Walgraeve
Summary: In this study, the removal of N,N-Dimethylformamide (DMF) was evaluated using a lab-scale biofilter for 472 days under mesophilic and thermophilic conditions. The biofilter achieved an average removal efficiency of 99.7% at ambient temperature with an inlet load of 297g DMF/m3 h and an EBRT of 10.7 s. However, a decrease in EBRT and an increase in temperature led to a decrease in removal efficiency. Microbial analysis revealed that the dominant bacteria were Rhizobiaceae and Alcaligenaceae, but their abundance decreased with increasing temperature. Overall, biofiltration showed promise for removing DMF from waste gas streams.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Kankana Kundu, Josefien Van Landuyt, Valerie Mattelin, Bram Martin, Marijke Neyts, Koen Parmentier, Nico Boon
Summary: This study found that the microbiome in sediment near a World War I munition dumpsite in the Belgian part of the North Sea can degrade 2,4,6-trinitrotoluene (TNT). The degradation of TNT was enhanced by adding methanol and several enriched genera, such as Colwellia, Thalossospira, and Methylophaga, were identified as TNT-utilizing bacteria.
MARINE POLLUTION BULLETIN
(2023)
Article
Polymer Science
Valerie Mattelin, Lennert Verfaille, Kankana Kundu, Stefaan De Wildeman, Nico Boon
Summary: With the accumulation of plastic waste in both controlled waste management settings and natural settings, there is a need for solutions in the field of biodegradation. However, determining the biodegradability of plastics in natural environments remains challenging due to low biodegradation rates. This study validates a colorimetric test using carbon nanodots to screen the biodegradation of plastics in natural environments. The results indicate that this method is a good alternative, but a combination of different methods provides the most information.
Article
Materials Science, Multidisciplinary
Ksenija Nikolic, Jelle De Wispelaere, Gopalakrishnan Ravi, Stijn Hertele, Tom Depover, Kim Verbeken, Roumen H. Petrov
Summary: Damage in bearings is closely related to microstructural alterations, known as white etching areas (WEAs) and white etching cracks (WECs). Non-metallic inclusions, such as manganese sulfides and aluminum oxides, are common in bearing steels. This study classifies 280 non-metallic inclusions according to various criteria and finds that the chemical composition is of secondary importance in damage initiation. The observations suggest that the state of non-metallic inclusion plays a crucial role in initiating rolling contact fatigue damage.
Article
Multidisciplinary Sciences
Margot De Spiegeleer, Vera Plekhova, Jozefien Geltmeyer, Ella Schoolaert, Beata Pomian, Varoon Singh, Kathleen Wijnant, Kimberly De Windt, Volter Paukku, Alexander De Loof, Inge Gies, Nathalie Michels, Stefaan De Henauw, Marilyn De Graeve, Karen De Clerck, Lynn Vanhaecke
Summary: In recent years, ambient ionization mass spectrometry (AIMS) has allowed for direct analysis of biofluid metabolome. However, AIMS procedures are hindered by analytical and practical limitations, which affect metabolome coverage. This study aimed to develop biofluid-specific metabolome sampling membranes (MetaSAMPs) to improve AIMS. Customized MetaSAMPs made of hydrophilic and lipophilic polymers demonstrated superior metabolome coverage and transport stability compared to crude biofluid analysis. This new approach was successfully validated and has potential applications in metabolic health stratification.
Article
Engineering, Manufacturing
Liesbet Deconinck, Elena Bernardo Quejido, Maria T. Villa Vidaller, Eric A. Jaegle, Kim Verbeken, Tom Depover
Summary: The interaction between hydrogen and laser powder bed fused (L-PBF) Ti-6Al-4V was investigated, taking into account the influence of (post-)processing parameters such as building orientation and surface finish. The study found that the stressed martensitic alpha' microstructure of the material showed beneficial properties against hydrogen assisted degradation. The as-built surface condition and the orientation of prior beta grains also had an impact on hydrogen uptake.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Chemical
Rishav Phukan, Leonardo Guttierez, Wim De Schepper, Marjolein Vanoppen, Kim Verbeken, Katleen Raes, Arne Verliefde, Emile Cornelissen
Summary: Electrodialysis is used in food and bio-based industries for selective separation and recovery of target ions and neutral molecules. Anion exchange membranes (AEM) are prone to fouling due to their complex interactions with organics. This study investigated fouling of two commercial AEM types using three different complex industrial feed streams and found that membrane structure, ion exchange capacity, water uptake, and thickness contributed to the difference in membrane resistance after fouling. LC-OCD analysis revealed highly hydrophilic fractions in the feed and desorption solutions, while foulant desorption was influenced by the solution used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Kevin Sabbe, Liese D'Haen, Nico Boon, Ramon Ganigu
Summary: As part of the circular bio-economy paradigm shift, waste management has shifted focus towards producing added-value compounds. The use of mixed culture bioprocesses for converting waste to platform chemicals has gained interest, but these processes often lack microbiological diversity and are prone to disturbances. To address this, flow cytometry was used to monitor a lactic acid chain elongation process for caproic acid production, allowing for qualitative and quantitative assessment. Specific community types were identified and correlated to functionality and genotypic diversity, and machine-learning algorithms showed high accuracy in predicting production rates.
Article
Engineering, Environmental
Thomas Pluym, Cristina Garcia-Timermans, Sander Vervloet, Riet Cornelissen, Nico Boon, Bart De Gusseme
Summary: The use of advanced membrane processes, such as reverse osmosis (RO), is crucial for producing process water and drinking water that meet microbiological standards. However, bacterial breakthrough and the passage of ultra-small species of bacteria can occur in reverse osmosis systems. Currently, microbiological and breakthrough monitoring is done through plating methods and conductivity monitoring, but this case study demonstrates the added value of using on-line flow cytometry for monitoring membrane integrity and microbial quality.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Environmental Sciences
Paula Alejandra Lamprea Pineda, Kristof Demeestere, Jose Joaquin Gonzalez-Cortes, Allan A. Alvarado-Alvarado, Nico Boon, Frank Devlieghere, Herman Van Langenhove, Christophe Walgraeve
Summary: This study investigated the removal of difficult-to-degrade VOC mixtures using biofiltration and the impact of operational conditions. The results showed that the type of inoculum and packing material influenced the removal efficiency, and different microbial populations dominated in the biofilters.
SCIENCE OF THE TOTAL ENVIRONMENT
(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.
