Article
Engineering, Chemical
Joosung Park, Mi-Young Lee, Seungyeob Han, Keun-Young Lee, Seoktae Kang
Summary: In this study, NaTi2(PO4)(3) (NTP) nanoparticles were incorporated into a carbon nanotube hollow-fiber (CHF) electrode for the selective removal of Na+ during the capacitive deionization (CDI) of salty water. The NTP-CHF electrode achieved higher Na+ adsorption capacity than CHF only electrodes, and sustained the Na+ adsorption capacity even in the presence of Ca2+ ions. The incorporation of NTP into the carbon nanomaterial network greatly improved the adsorption capacity and selectivity of Na+ compared to conventional carbon-based electrodes.
Article
Materials Science, Multidisciplinary
Zhenzhen Liu, Haibo Li
Summary: The study prepared CMO microspheres with porous core-shell structure and investigated their properties. As an electrode for capacitive deionization, the optimized AC || CMO device exhibited high salt removal capacity and current efficiency, with a relatively high capacity retention rate. It was found that the intercalation/de-intercalation of sodium ions in CMO were governed by the (103) and (221) crystal planes, which had higher adsorption energies for Na+.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Engineering, Chemical
Alessandra P. Silva, Alexandre Argondizo, Patricia T. Juchen, Luis A. M. Ruotolo
Summary: CDI is an attractive desalination technology due to the use of inexpensive carbon electrodes, and in this study, RHAC electrodes synthesized at different carbonization temperatures showed enhanced desalination performance and ultrafast kinetics. RHAC carbonized at 600 degrees C exhibited outstanding salt removal capacity per gram of electrode per day.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Benqiang Cen, Rui Yang, Kexun Li, Cuicui Lv, Bolong Liang
Summary: The study demonstrated that the covalently bonded quaternized activated carbon (QRAC) material showed efficient and selective adsorption of nitrate in water. This new material has the potential for effective removal of nitrate pollution in water and provides insights into the selective electrosorption of CDI technology.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Njideka C. Nnorom, Tanya Rogers, Amit Jain, Abdullah Alazmi, Welman Curi Elias, Ryan M. DuChanois, Kenneth Flores, Jorge L. Gardea-Torresdey, Marya Cokar, Menachem Elimelech, Michael S. Wong, Rafael Verduzco
Summary: Recent studies have shown that an ion-selective polymer coating can significantly enhance ion selectivities for membrane capacitive deionization (MCDI) processes. By depositing thin PEDOT:PSS coatings on composite electrodes, a preferential permeability of Ca2+ over Na+ has been achieved.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Shuhong Xiang, Hengjian Mao, Wusong Geng, Yingsheng Xu, Hongjian Zhou
Summary: A chestnut shell derived porous carbon material modified with aryl diazonium salt was developed as an electrode for selective removal of Sr2+ from saliferous radioactive wastewater. The modified electrode exhibited improved Sr2+ electrosorption capacity and ion removal rate, as well as excellent cycling stability and charge efficiency. The study also revealed the mechanism of Sr2+ selectivity.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Qi Dong, Dongxu Yang, Liang Luo, Qiang He, Fangheng Cai, Si Cheng, Yi Chen
Summary: This study utilized waste biomass to prepare porous biochar electrodes, achieving an improved fluoride removal efficiency and demonstrating the potential application of this method in environmental remediation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Review
Engineering, Chemical
Shuqian Chai, Jiarui Xi, Ling Chen, Wei He, Junjie Shen, Hui Gong
Summary: This paper provides an overview of the current status of selective ion removal in capacitive deionization (CDI) and discusses the prospects of CDI in desalination, heavy metal removal and recovery, and other fields. The insights from this review will inform the implementation of CDI technology.
Article
Engineering, Chemical
Bin Xu, Ranran Wang, Yamin Fan, Bei Li, Jie Zhang, Fuquan Peng, Yi Du, Wenzhong Yang
Summary: This study successfully improved the efficiency of capacitive deionization (CDI) technology for arsenic removal by modulating the structure of graphene and fabricating a monolithic mesh self-supporting electrode, providing new ideas for the large-scale application of this technology.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Po-Chang Wu, Dinh Viet Cuong, Jhen-Cih Wu, Sofia Ya Hsuan Liou, Chia-Hung Hou
Summary: A novel bifunctional nanocomposite CoOx/AC electrode was developed for simultaneous in-situ electrocatalytic oxidation of As(III) and efficient electrosorption of As(V). The experiments demonstrated that elevated pH can enhance the As(III) removal efficiency. Compared to the traditional AC electrode, the CoOx/AC electrode showed higher electrosorption capacity and lower energy consumption.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yujie Zhang, Yuehan Wang, Juanqin Xue, Changbin Tang
Summary: This study developed a composite electrode (GO/PPy/MnO2) for capacitive deionization (CDI) by depositing MnO2 and PPy on the surface of graphene oxide. The electrode showed high specific capacitance and improved cycling stability, as well as enhanced electrochemical properties. Additionally, the composite exhibited excellent Cu2+ ion adsorption capacity, making it a promising material for CDI applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Electrochemistry
Shuo San, Bingqi Feng, Zhouchao Xu, Jian Yu, Zheng Cao, Yang Fan, Shupeng Zhang
Summary: This review provides a comprehensive overview of the application of Zn-based MOF-derived carbon materials in electrosorption desalination technology. Among them, the ZIF-8 derived carbon electrode materials are summarised in detail, and different approaches for improving their performance are discussed.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Bethwel K. Tarus, Yusufu A. C. Jande, Karoli N. Njau
Summary: Capacitive deionization is a promising method for water desalination, and the use of nanostructured porous carbon materials, such as electrospun carbon nanofibers, can enhance desalination performance. Compositing carbon nanofibers with faradaic materials can improve ion storage capacity.
NEW CARBON MATERIALS
(2022)
Article
Chemistry, Physical
Xiaoxiao Liu, Ling Liu, Jie Zhang, Qinghan Meng
Summary: The holey graphene hydrogel (r-HGH) synthesized using a one-step hydrothermal method shows high specific capacitance and low internal resistance, making it a promising electrode material for capacitive deionization and wastewater treatment.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Chemical
Ting Lu, Yong Liu, Xingtao Xu, Likun Pan, Asma A. Alothman, Joe Shapter, Yong Wang, Yusuke Yamauchi
Summary: Capacitive deionization (CDI) utilizes the electrical double layer to separate ions from saline water. There is growing interest in using low-cost, eco-friendly carbon materials derived from abundant biomass for CDI. Carbon nanoflakes prepared from xylose pyrolysis with KHCO3 show promising salt adsorption capacity, indicating potential industrial application for CDI.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Sen Lu, Xuechuan Li, Yunkai Liao, Zhenghua Zhang, Haijian Luo, Guan Zhang
Summary: The photoelectrocatalytic (PEC) process is a promising technology for ammonia oxidation in water treatment, but limited in situ generation of oxidants, slow mass transfer, and nitrate/nitrite by-products hinder its further application. In this study, different transition metals (Ni, Fe, Mn, Co, Cu) were screened as graphite felt (GF) cathode modifiers, and the Ni-GF cathode showed the best electrocatalytic activity for H2O2 generation. The PEC system composed of Ni-GF cathode and optimized titania nanotubes (TNTs) photoanode efficiently converted ammonia to N2 without nitrate/nitrite by-products. The synergistic oxidation system demonstrated the simultaneous generation of oxidants on both anode and cathode, and reactive oxygen-based oxidants and chlorine-based oxidants played a leading role in ammonia oxidation.
Article
Chemistry, Physical
Wei Zhang, Shaoze Zhang, Chenchen Meng, Zhenghua Zhang
Summary: Sulfate radical-based advanced oxidation processes (SR-AOPs) are an efficient method for removing organic pollutants in water bodies. A novel cobalt-functionalized graphitic carbon nitride (Co@g-C3N4) membrane has been designed and prepared for the first time, which can activate peroxymonosulfate (PMS) to degrade pollutants and maintain stability during long-term operation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Muhammad Bilal Asif, Hongyu Kang, Zhenghua Zhang
Summary: This study presents a novel strategy of using CoAl-LMO membrane and PMS for Fenton-like catalysis, which effectively degrades various pharmaceuticals and personal care products (PPCP) in water treatment. The system demonstrates long-term stability and offers a potential sustainable solution for efficient removal of PPCPs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Narayana R. Aluru, Fikret Aydin, Martin Z. Bazant, Daniel Blankschtein, Alexandra H. Brozena, J. Pedro de Souza, Menachem Elimelech, Samuel Faucher, John T. Fourkas, Volodymyr B. Koman, Matthias Kuehne, Heather J. Kulik, Hao-Kun Li, Yuhao Li, Zhongwu Li, Arun Majumdar, Joel Martis, Rahul Prasanna Misra, Aleksandr Noy, Tuan Anh Pham, Haoran Qu, Archith Rayabharam, Mark A. Reed, Cody L. Ritt, Eric Schwegler, Zuzanna Siwy, Michael S. Strano, YuHuang Wang, Yun-Chiao Yao, Cheng Zhan, Ze Zhang
Summary: Confined fluids and electrolyte solutions in nanopores exhibit rich and surprising physics and chemistry that impact the mass transport and energy efficiency in many important natural systems and industrial applications. Exploiting these effects presents myriad opportunities in both basic and applied research that stand to impact a host of new technologies. In this review article, the progress on nanofluidics of single-digit nanopores (SDNs) is summarized, with a focus on the confinement effects. The recent development of precision model systems, transformative experimental tools, and multiscale theories in this field are reviewed.
Article
Engineering, Environmental
Ryan M. DuChanois, Lauren Mazurowski, Hanqing Fan, Rafael Verduzco, Oded Nir, Menachem Elimelech
Summary: The separation of specific ions in water is essential for the recovery and reuse of metals and nutrients, but current membrane technologies lack the required precision selectivity for a circular resource economy. This study investigates whether the cation/cation selectivity of a composite cation-exchange membrane (CEM) is affected by the mass transfer resistance of the underlying CEM. The results show that eliminating resistance from the base layer of the CEM can significantly increase selectivity, highlighting the importance of low-resistance CEMs for precise separations with composite membranes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Ragne Parnamae, Michele Tedesco, Min-Chen Wu, Chia-Hung Hou, Hubertus V. M. Hamelers, Sohum Patel, Menachem Elimelech, P. M. Biesheuvel, Slawomir Porada
Summary: In this study, a trackable model based on the Nernst-Planck theory was developed to predict the behavior of a commercial bipolar membrane. The model successfully predicted the concentration profiles of four ions (H+, OH-, Na+, and Cl-) inside the membrane and the resulting current-voltage curve, providing new insights into ion transport in bipolar membranes and identifying optimal operating conditions for environmental applications.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Li Wang, Tianchi Cao, Kevin E. Pataroque, Masashi Kaneda, P. Maarten Biesheuvel, Menachem Elimelech
Summary: It has been observed that the salt permeability of polyamide reverse osmosis (RO) membranes increases as the feed salt concentration increases. However, studies using analytical techniques have shown that the salt partitioning coefficient decreases with increasing salt concentration, contradictory to the increase in salt permeability. In this study, the dependence of total ion and co-ion partitioning coefficients on salt concentration and solution pH was investigated. Results showed that the co-ion partitioning increased while total ion partitioning decreased with increasing salt concentration. The increase in co-ion partitioning was in line with the trend of salt permeability observed in RO experiments. The study further demonstrated that the dependence of salt and co-ion partitioning on salt concentration was more pronounced at a higher solution pH. The results suggest that co-ion partitioning, rather than salt partitioning, governs salt transport through RO membranes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Sohum K. Patel, Weiyi Pan, Yong-Uk Shin, Jovan Kamcev, Menachem Elimelech
Summary: The study introduces a novel electrosorption-based boron removal technology using a bipolar membrane (BPM) between porous carbon electrodes, showing its potential to overcome the limitations of current methods. The mechanism of boron removal is confirmed to be electrosorption rather than adsorption. The effect of applied voltage on the process efficiency is evaluated, and the BPM-electrosorption system is compared with flow-through electrosorption, demonstrating advantages in boron sorption capacity and energy consumption. Overall, the BPM-electrosorption system shows promising boron removal capability.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Travis S. S. Laws, Hao Mei, Tanguy Terlier, Rafael Verduzco, Gila E. E. Stein
Summary: Reactive bottlebrush polymers based on S and tBA were developed as additives for PS coatings. The hydrophilicity and substrate adherence of PS films can be controlled by the thermal activation of tBA deprotection. By incorporating a mixture of PtBA and PS side chains into the bottlebrush, the water contact angle decreases and the substrate adherence improves proportionally.
Article
Engineering, Chemical
Yang Li, Bingxuan Ji, Ziyang Chen, Zhenghua Zhang
Summary: Using membrane distillation with dopamine-functionalized PTFE membranes (DA@PTFE) can effectively reduce membrane fouling caused by natural organic matter in secondary effluent, thus increasing the water production rate and stability of the MD system. The DA@PTFE membranes demonstrated improved MD performance with increased flow rate and reduced flux decay compared to pristine PTFE membranes. Additionally, the DA@PTFE membranes exhibited high water quality permeate with high rejection rates of conductivity and dissolved organic carbon. This study highlights the potential of DA@PTFE membranes for real application in reclaimed water treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Nanoscience & Nanotechnology
Kuichang Zuo, Sergi Garcia-Segura, Gabriel A. Cerron-Calle, Feng-Yang Chen, Xiaoyin Tian, Xiaoxiong Wang, Xiaochuan Huang, Haotian Wang, Pedro J. J. Alvarez, Jun Lou, Menachem Elimelech, Qilin Li
Summary: Electrified processes provide a chemical-free solution for removing a wide range of contaminants from water, including those difficult to treat using conventional methods. This review presents the principles of several electrified water treatment processes and emphasizes the importance of electrode materials in contaminant transport and transformation.
NATURE REVIEWS MATERIALS
(2023)
Article
Engineering, Chemical
Yang Li, Bingxuan Ji, Ziyang Chen, Zhenghua Zhang
Summary: Secondary effluent from municipal wastewater treatment plants can be converted into reclaimed water using membrane distillation (MD), providing a potential solution to the global water crisis. Researchers have developed a novel surface-modified PTFE membrane to overcome membrane fouling and improve the performance of MD systems. This study demonstrates the feasibility of using the Tyr/PDA@PTFE membrane for effective treatment of secondary effluent and production of reclaimed water.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yifan Gao, Shuai Liang, Biming Liu, Chengxu Jiang, Chenyang Xu, Xiaoyuan Zhang, Peng Liang, Menachem Elimelech, Xia Huang
Summary: Researchers have proposed a facile and highly controllable thermal tuning strategy that enables fine control of nanodefects in electrocatalysts. This strategy endows common carbon materials with record high efficiency in electrocatalytic degradation of pollutants.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Lele Cui, Bin Chen, Longshun Zhang, Chen He, Chen Shu, Hongyu Kang, Jian Qiu, Wenheng Jing, Kostya (Ken) Ostrikov, Zhenghua Zhang
Summary: This study demonstrates an anti-electrowetting carbon film electrode with self-sustained aeration, which is assembled using structurally discontinuously fractured conventional electrocatalyst films. It achieves highly selective and durable electrochemical two-electron oxygen reduction, providing a promising direction for developing cheap and scalable metal-free electrodes for industry-scale H2O2 electrosynthesis.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Mohammad Heiranian, Hanqing Fan, Li Wang, Xinglin Lu, Menachem Elimelech
Summary: This article provides an overview of the importance of reverse osmosis (RO) desalination technology in addressing water scarcity. The design and development of RO membranes are discussed, along with an analysis of membrane separation and transport mechanisms. Two key water transport models, solution-diffusion and pore-flow, are examined and evaluated. Future research directions are also proposed.
CHEMICAL SOCIETY REVIEWS
(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.
