Article
Geochemistry & Geophysics
Marzia Miletto, Xiangli Wang, Noah J. Planavsky, George W. Luther, Timothy W. Lyons, Bradley M. Tebo
Summary: Stable chromium isotopes have been used as a paleoredox proxy to track atmospheric oxygenation, with previous belief that Cr oxidation is limited to terrestrial settings. However, recent research shows rapid marine Cr(III) oxidation linked to microbial Mn(II) oxidation, challenging the traditional view. Initial partial oxidation of Cr(III) to Cr(VI) can cause a small isotope fractionation, calling for a reevaluation of the link between Cr isotope values and atmospheric oxygenation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Andrew J. Berry, Laura A. Miller, Hugh St C. O'Neill, Garry J. Foran
Summary: The study determined the bond lengths of Cr2+-O and Cr3+-O in CaO-MgO-Al2O3-SiO2 glasses containing 0.3 wt% Cr by EXAFS spectroscopy, and calculated the force constants of Cr in silicate melts based on these bond lengths. These data provide additional constraints for modeling and interpreting Cr isotope fractionation during igneous petrogenesis.
Review
Environmental Sciences
Jialiang Liang, Xinmiao Huang, Jingwen Yan, Yunyi Li, Zhiwei Zhao, Yuanyuan Liu, Jiangyu Ye, Yunmei Wei
Summary: This review discusses the process of Cr(III) oxidation generating Cr(VI) in soils and groundwater, with manganese oxides, hydrogen peroxide, and photochemical generated radicals playing dominant roles under different conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
S. Klemme, F. Genske, P. A. Sossi, J. Berndt, C. J. Renggli, A. Stracke
Summary: The new experimental results reveal fractionation of Cr isotopes during degassing of silicate melts. Lighter isotope Cr-52 is enriched in the gas phase and residual melt becomes enriched in the heavier Cr-53 isotope. This study provides important clues for understanding the recording of chromium isotope loss by evaporation in terrestrial magmas.
Article
Engineering, Environmental
Ming Ao, Shengsheng Sun, Tenghaobo Deng, Feng Zhang, Ting Liu, Yetao Tang, Jingjing Li, Shizhong Wang, Rongliang Qiu
Summary: Cr(VI) in soils and groundwater is primarily derived from the oxidation of geogenic Cr(III) minerals rather than direct emissions. The oxidation of Cr(III) is mainly facilitated by Mn oxides in anoxic soils and by O-2 in oxic soils. The presence of Mn oxides promotes the oxidative dissolution of chromite even under anoxic conditions. The form of Cr, the abundance of Mn oxides, and the presence of reducing agents control the content of Cr(VI) in soil.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Crystallography
Kaiyin Chen, Lauren Bocknek, Bruce Manning
Summary: The study found that naturally occurring Cr(III) will readily oxidize to Cr(VI) when it comes in contact with MnO2, forming a highly mobile and toxic groundwater contaminant.
Article
Geochemistry & Geophysics
Claresta Joe-Wong, Karrie L. Weaver, Shaun T. Brown, Kate Maher
Summary: Chromium stable isotope ratios can be used to trace the reduction of Cr(VI) to Cr(III) in both ancient and modern systems. The study found that the fractionation factors during Cr(VI) reduction by Fe(II/III)-bearing clay minerals can be predicted from the standard reduction potential or Fe(II)/Fe(total) of the clay, potentially improving the ability to model Cr isotope signatures in geochemical systems. This linear free energy relationship may provide a model for determining other redox-driven kinetic isotope effects in environmentally important isotope systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Engineering, Environmental
Hai Liu, Guipeng Tian, Wenyi Wang, Jiachunxiu Zhang, Tianshu Wu, Xinye Ni, Yin-Hu Wu
Summary: The reduction of Cr(VI) to Cr(III) and subsequent precipitation, using a flow-through electrode system (FES), simplifies the treatment processes and offers potential for recollecting Cr resources. The study demonstrates that a multi-cathode FES system can significantly enhance Cr(VI) reduction and Cr(III) precipitation efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Water Resources
Alexandre Andronikov, Martin Novak, Pavel Kram, Ondrej Sebek, Irina E. Andronikova, Marketa Stepanova, Hyacinta Vitkova, Elena Antalova, Arnost Komarek
Summary: Research conducted in a Central European headwater catchment suggests that the isotope characteristics of different bedrock types have a seasonal impact on runoff, with higher Cr(VI) export fluxes in winter and lower fluxes in summer. This seasonal variation could be related to the removal of isotopically light Cr that accumulates in soil during summer by elevated Cr runoff fluxes in winter.
HYDROLOGICAL PROCESSES
(2021)
Article
Energy & Fuels
Yuan Bao, Dan Li, Yiwen Ju
Summary: The study found that different ranks of coal can be degraded by microorganisms to produce biomethane, with biomethane production being mainly influenced by maceral content. The generation processes of methane and carbon dioxide exhibit three-phase characteristics, and the carbon isotope composition of biodegraded coal is lighter than that of raw coal.
Article
Environmental Sciences
Xiangke Kong, Yanyan Wang, Lisha Ma, Hui Li, Zhantao Han
Summary: The oxidation of Cr(III) by birnessite (delta-MnO2) has significant impact on the toxicity and mobility of dissolved Cr(III) in soils. The presence of Fe and Al oxides coating on delta-MnO2 hinders the oxidation process. The oxidation of Cr(III) by delta-MnO2 follows a two-phase model and is influenced by the diffusion and adsorption of Cr(III) on electron-accepting sites.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Xiaojing Yang, Ziwen Zhao, Bach Van Nguyen, Shota Hirayama, Caixing Tian, Zhongfang Lei, Kazuya Shimizu, Zhenya Zhang
Summary: This study utilized algal-bacterial AGS for Cr(VI) bioremediation, achieving a significant total Cr removal efficiency increase with external electron donor supply. Addition of antibiotic or metabolic inhibitor negatively affected bacterial AGS but not algal-bacterial AGS, with analysis showing that algal-bacterial AGS secreted more EPS favoring Cr(VI) reduction under Cr(VI) exposure. Chemical fractionation results indicated a low environmental risk of Cr-loaded algal-bacterial AGS after biosorption of hazardous heavy metals from wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Chenwei Liang, Fenglian Fu, Bing Tang
Summary: The incorporation of Mn into ferrihydrite enhances the adsorption capacity for Cr(VI), inhibits its migration, and increases its retention in the environment.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Jia Chen, Xiaoguang Li, Longzhan Gan, Guangyang Jiang, Ruoshi Zhang, Zhe Xu, Yongqiang Tian
Summary: The isolated strain Lysinibacillus HST-98 shows promising results in reducing Cr(VI) pollution, even at high concentrations. Optimal growth conditions for the strain include a pH of 8-9, a temperature of 36 degrees Celsius, and sodium lactate as an electron donor. Coexisting metal ions like Cu2+, Co2+, and Mn2+ enhance Cr(VI) reduction, while Zn2+, Ni2+, and Cd2+ have the opposite effect. The reduction mechanism of strain HST-98 is primarily mediated by intracellular enzymes, and the genes and enzymes related to chromium metabolism in this strain have been annotated to further understand its mechanism.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Ashley B. Davidson, Chris Holmden, Sulung Nomosatryo, Cynthia Henny, Roger Francois, Sean A. Crowe
Summary: The leaching of lateritic soils in Central Sulawesi Island, Indonesia can lead to drainage waters with high concentrations of Cr(VI). A remediation strategy involving FeSO4 solutions effectively removes Cr(VI) from the drainage, but the presence of Mn oxides may cause the oxidative remobilization of Cr(III) and lead to an increase in Cr(VI) concentration downstream. Further improvements to Cr(VI) remediation should focus on preventing the back reaction of Cr(III) with Mn oxides.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shuping Li, Yue Chen, Yongze Lu, Gangyin Ya, Mengjie Co, Guangcan Zhu
Summary: The anaerobic/aerobic sequencing batch reactor (SBR) system has high nitrogen and phosphorus removal efficiencies in plateau regions, and its performance is significantly affected by atmospheric pressure.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Article
Engineering, Environmental
Yongzhen Wang, Yongze Lu, Xin Li, Guangcan Zhu, Na Li, Jing Han, Liwei Sun, Zhonglian Yang, Raymond Jianxiong Zeng
Summary: This study investigates the interactions between co-metabolism and photodegradation in the degradation of trace organic compounds (TOrCs). Results show that co-metabolism coupled with photodegradation significantly enhances the degradation efficiency of TOrCs, and light also reduces the toxicity of co-metabolism degradation products.
Article
Engineering, Environmental
Jingya Wu, Liling Zhang, Meng Zhang, Yongze Lu, Yani Zhao, Shuping Li, Liwei Sun, Guangcan Zhu
Summary: The biological treatment process in high-altitude areas is affected by low atmosphere pressure and low oxygen content. However, simultaneous nitrification, denitrification, and phosphorus removal (SNDPR) process can effectively solve the problems with high efficiency and low operation cost. Under the condition of 72 kPa, optimizing the SNDPR system by prolonging the anaerobic time and reducing the aeration time can improve the treatment performance.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Chu-Ya Wang, Xin Fang, Qi Zeng, Heng-Deng Zhou, Yongze Lu
Summary: In this study, a series of Au-doped BiOBr photocatalysts were prepared through a one-step hydrothermal method, and the Au-0.3-BiOBr nanosheets showed significantly enhanced charge separation efficiency and photocatalytic activity compared to pure BiOBr.
Article
Geochemistry & Geophysics
Zhaoxia Xia, Yang Yang, Tongxu Liu, Guojun Chen, Pei Wang, Songxiong Zhong, Chengrong Nie, Fangbai Li
Summary: The study investigates the mechanisms controlling Cr transformation during anoxic-oxic alternation in basalt-derived paddy soils. It reveals that available Cr fractions increase under anoxic phase but decrease under oxic phase, indicating the reversibility of Cr availability. The study also establishes kinetic models to quantitatively describe Cr transformation during anoxic-oxic alternation in these soils.
Article
Chemistry, Physical
Shiwen Hu, Lirong Zheng, Hanyue Zhang, Guojun Chen, Yang Yang, Zhuozhi Ouyang, Shuling Chen, Kun Gao, Chongxuan Liu, Qi Wang, Tongxu Liu
Summary: Interactions between manganese (Mn) and iron (Fe) in soils and sediments were studied to understand the abiotic transformation mechanisms. It was found that increasing pH promoted the oxidation of Mn(II) into Mn minerals, and hematite enhanced the oxidation rates of Mn(II). Different mineral formations were observed at different pH levels, and an autocatalytic reaction resulted in the formation of a co-shell structured nanowire. Electron transfers between Mn(II) and O2 occurred, either on the surface or through the bulk phase of hematite, and both direct and indirect electron transfers contributed to overall reactions. These findings provide insights into Fe-Mn interactions and their implications for element cycling.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Environmental
Kaiyi Huang, Yang Yang, Hansha Lu, Shiwen Hu, Guojun Chen, Yanhong Du, Tongxu Liu, Xiaomin Li, Fangbai Li
Summary: This study investigates the transformation processes of nickel in paddy soils under anoxic and oxic conditions. The results show that under anoxic conditions, complexation with soil organic matter dominates nickel immobilization, while under oxic conditions, organic matter and Fe-Mn oxides contribute similarly to nickel release.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Han Li, Xiangjie Zhang, Ying Zhang, Kuan Cheng, Chao Peng, Guojun Chen, Fangbai Li, Tongxu Liu
Summary: Microbially mediated nitrate-reducing Fe(II) oxidation (NRFO) has shown potential for removing nitrogen in wastewater, but the continuous need for iron blocks its scalability. In this study, Shewanella oneidensis strain MR-1 successfully mediated the Fe redox process, but the second iron cycle was weaker and unsustainable due to nitrate reduction inhibition caused by cell encrustation and nutrient shortage. These findings expand the understanding of microbial iron cycling and provide insights for improving biological wastewater treatment based on NRFO.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Ming -Chao Zhu, Yong-Ze Lu, Shou-Wen Chen, Zhao-Xia Hu, Jing-Wei Wang, Na Li, Raymond Jian-Xiong Zeng
Summary: Carbon nano-onions were used in an anaerobic membrane bioreactor to treat chloramphenicol wastewater, effectively degrading chloramphenicol and enhancing the growth of methanogens.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Dandan Chen, Kuan Cheng, Tongxu Liu, Guojun Chen, Andreas Kappler, Xiaomin Li, Raymond Jianxiong Zeng, Yang Yang, Fujun Yue, Shiwen Hu, Fang Cao, Fangbai Li
Summary: This study demonstrates that dual N-O isotopes and kinetic modeling can be used to distinguish biological and chemical processes during microbially mediated NRFO. The main nitrate reductase in Acidovorax sp. strain BoFeN1 was found to be membrane-bound dissimilatory nitrate reductase (Nar). N-O isotopes can be used to differentiate between chemical and biological reactions, and chemodenitrification plays a more important role than biological reactions during the coupled process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Songxiong Zhong, Liping Fang, Xiaomin Li, Tongxu Liu, Pei Wang, Ruichuan Gao, Guojun Chen, Haoming Yin, Yang Yang, Fang Huang, Fangbai Li
Summary: This study investigates the influence of chloride and sulfate ions on the transport of cadmium (Cd) in the soil-rice system. The results show that chloride and sulfate ions increase the concentration of Cd in the soil solution, Fe plaque, and rice plants, facilitating the mobility of Cd isotopes and contributing to Cd immobilization in the Fe plaque and uptake into roots. The findings provide insights into the role of anions in Cd migration and transformation in the soil-rice system.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Yangmei Fei, Baogang Zhang, Dandan Chen, Tongxu Liu, Hailiang Dong
Summary: This study confirmed the effectiveness of two denitrifying bacteria in reducing V(V) and provided molecular insights into the enzyme catalysis and electron transfer pathways involved in V(V) reduction. It advances understanding of the environmental biogeochemistry of vanadium and contributes to the development of sustainable bioremediation strategies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Wenting Chi, Guojun Chen, Shiwen Hu, Xiaomin Li, Kuan Cheng, Qi Wang, Bingqing Xia, Yang Yang, Yibing Ma, Tongxu Liu
Summary: Paddy fields located around estuaries face the issue of seawater intrusion, and the impact of salinity levels on Cd accumulation in rice grains is still unclear. Pot experiments were conducted to investigate the effects of different salinity levels on Cd availability and uptake by rice plants. The results showed that higher salinity levels increased Cd availability and uptake in rice roots and grains, mainly due to competition for binding sites by cations and the formation of Cd complexation with anions. The study highlights the importance of considering food safety in rice cultivation near estuaries.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Wei-Jia Yu, Ji Sun, Wei-Jia Zhang, Yue Chen, Jun-Ling Yang, Shu-Ping Li, Guang-Can Zhu, Yong-Ze Lu
Summary: In high-altitude regions, the diminished oxygen content reduces the efficiency of wastewater treatment and makes conventional methods unsustainable. The simultaneous nitrification and denitrification (SND) process is a promising solution in low-pressure environments. Low pressure and organic loading enhance nitrogen removal performance and SND efficiency.
Article
Engineering, Environmental
Mingchao Zhu, Jingwei Wang, Danni Pei, Ji Sun, Yongze Lu, Zhaoxia Hu, Shouwen Chen, Na Li
Summary: The study employed an anaerobic membrane bioreactor (AnMBR) to successfully treat high-calcium papermaking wastewater, achieving high removal efficiency of COD and no significant accumulation of volatile fatty acids. Furthermore, the study found that the methane production capacity was negatively correlated with the inlet calcium ion concentration.
JOURNAL OF WATER PROCESS ENGINEERING
(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.
