Review
Agricultural Engineering
Longyi Lv, Jiarui Chen, Xiaoyang Liu, Wenfang Gao, Li Sun, Zhijun Ren, Pengfei Wang, Guangming Zhang, Weiguang Li
Summary: The paper systematically summarizes and analyzes the quorum sensing (QS) system in anaerobic granular sludge (AnGS), including its influence on the metabolic activity, physicochemical properties, and microbial community of AnGS. The regulation mechanism of QS in AnGS is analyzed from two systems of single bacterium and mixed bacteria. This review provides a comprehensive understanding of QS functions in AnGS systems, and promotes the practical application of QS-based strategies in optimization of AnGS treatment process.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Wencai Fu, Meiling Li, Wenhao Dang, Kaili Zhu, Guoning Chen, Jian Zhang, Shuangfei Wang, Yanzhu Guo, Zhiwei Wang
Summary: Research shows that triggering microbiota quorum sensing by 3O-C6-HSL can inhibit the calcification of AnGS and promote the growth of beneficial microorganisms, reducing calcium carbonate formation and increasing microbial activity recovery, as well as broadening the mass transfer channel.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Qing Du, Quanhua Mu, Guangxue Wu
Summary: Understanding microbial interactions in the methanogenesis system through quorum sensing (QS) is crucial for system optimization. In this study, a hierarchical quorum sensing database (QSDB) was constructed and analyzed to predict the AHLs system as the most probable QS system in methanogens. Additionally, the fill/filR system, a luxI/luxR homolog, was detected in methanogens for the first time, showing a higher abundance in certain reactors.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Han Yan, Jianzheng Li, Jia Meng, Jiuling Li, Avinash Kumar Jha, Yafei Zhang, Yiyang Fan, Xin Wang
Summary: The performance of anaerobic sludge and microbial social behaviors in an expanded granular sludge bed (EGSB) were evaluated by increasing reflux ratio from 50% to 500% in stages. The study found that a reflux ratio of 100% - 200% was most favorable for EGSB with a methane production of 2.4 m3/m3.d. Acylhomoserine lactones (AHLs)-mediated quorum sensing (QS) played a key role in balancing microbial populations and enhancing the anaerobic digestion process.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Hong-Xin Shi, Xu Wang, Jin-Song Guo, Fang Fang, You-Peng Chen, Peng Yan
Summary: This study found that the proliferation of filamentous bacteria during filamentous bulking is associated with population density and AHLs concentration. The triggering of the QS-AHL system promotes the proliferation of filamentous bacteria, while the addition of the quorum sensing inhibitor vanillin effectively inhibits filamentous bulking.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
V. A. Haaksman, M. Schouteren, M. C. M. van Loosdrecht, M. Pronk
Summary: This study compared two different anaerobic contact modes, bottom-feeding and completely mixed pulse-feeding, and found that bottom-feeding can distribute sewage more evenly across different granule sizes, while completely mixed pulse-feeding allows for a more equal distribution of sewage across all granules. The anaerobic contact mode directly affects the distribution of sewage on the granules.
Article
Agricultural Engineering
Wenda Chen, Huiming Tang, Wenji Li, Da Kang, Baolan Hu, Ping Zheng, Meng Zhang
Summary: By comparing an ecological anaerobic reactor (EAR) with a physical anaerobic reactor (PAR), it was found that EAR achieved a higher organic loading rate (OLR) due to its ecological distribution, while PAR had a lower OLR due to its physical distribution. These findings suggest that promoting ecological distribution and weakening hydraulic selection can improve reactor performance.
BIORESOURCE TECHNOLOGY
(2023)
Review
Environmental Sciences
Anna Christine Trego, Simon Mills, Gavin Collins
Summary: Anaerobic digestion is recognized as a sustainable method for waste management, producing methane-rich biogas. Different specialized granules, including anaerobic and aerobic granules, have opened up new opportunities in wastewater treatment and resource recovery biotechnology. Each type of granule has unique characteristics, biochemical processes, and microbial community compositions.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Huihui Zhou, Defeng Xing, Jun Ma, Yanyan Su, Yifeng Zhang
Summary: Bioelectrochemical anaerobic digestion (BEAD) is an attractive method for enhancing biogas production. This study explores the use of intact anaerobic granular sludge (AGS) as a biocatalyst for efficient methane production. The BEAD system was optimized by controlling the applied voltage and acetate load, and the AGS-based system showed promising results for degrading highly concentrated organic waste. The microbial communities at the anode and cathode were also analyzed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Microbiology
Xiaojie Zhang, Baobao Liu, Xueyan Ding, Peng Bin, Yang Yang, Guoqiang Zhu
Summary: The QS system plays a central role in the regulation of virulence in Salmonella, and blocking this system may be a new strategy for treating Salmonella infection. Studying the application of QQ technology in Salmonella infection can provide insight into the regulation mechanism of bacterial virulence.
Review
Microbiology
Linbo Li, Yuru Pan, Shishuang Zhang, Tianyou Yang, Zhigang Li, Baoshi Wang, Haiyan Sun, Mingxia Zhang, Xu Li
Summary: This review summarizes the research history and hotspots of quorum sensing (QS) in Saccharomyces cerevisiae, focusing on the regulatory mechanism of quorum sensing molecule (QSM) synthesis, factors influencing QSM production, and the response mechanism of QSMs. The review also highlights the applications of QS in stress adaptation, increasing fermentation products, and food preservation in S. cerevisiae.
FRONTIERS IN MICROBIOLOGY
(2023)
Review
Engineering, Environmental
Zhiwei Wang, Keyang Jiang, Yunpeng Zhu, Ling Liu, Xuelian Zou, Xiao Yang, Yihu Xu, Jian Zhang, Yubao Chen, Wenhua Gao, Shuangfei Wang
Summary: During the anaerobic treatment of high-calcium organic wastewater, the formation of calcium carbonate or calcium phosphate precipitates on the biofilm surface affects the mass transfer and microbial breeding space of anaerobic granular sludge (AnGS), resulting in biomass reduction and decreased AnGS activity. This study analyzed the mechanisms of AnGS calcification and the migration of calcium precipitation into the interior of AnGS. Traditional methods for controlling calcification and removing calcified AnGS are costly and ineffective. A new approach for resolving AnGS calcification is proposed by optimizing flora and improving sludge activity.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Environmental Sciences
Parthiban Anburajan, Roent Dune Cayetano, You Mit Prohim, Nguyen Tang Thau, Sungmi Kim, Hyeok Kim, Je Hyeon Ko, Hyun-Suk Oh
Summary: This review examines the roles of quorum sensing (QS) and quorum quenching (QQ) in anaerobic digestion processes. QS signal molecule AHL can promote biofilm formation and organic degradation, thereby improving the efficiency of anaerobic digestion. QQ has been shown to effectively control membrane fouling. However, its impact on methane productivity remains unclear.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Zhenqing Zhao, Lianjie Wang, Jiahui Miao, Ziyan Zhang, Jingqi Ruan, Lijie Xu, He Guo, Ming Zhang, Weichuan Qiao
Summary: Outer membrane vesicles (OMVs) can package and mediate signal molecules to regulate biofilm formation, promoting growth and changing structure of biofilms. OMV-mediated signals affect the composition of extracellular polymeric substances and lead to enhanced inhibition of other bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Jinfeng Wang, Qiuju Liu, Deyuan Dong, Haidong Hu, Bing Wu, Hongqiang Ren
Summary: This study investigated the bacterial QS threshold and response to AHLs in various biofilms through real time cell analysis, revealing that exogenous AHLs significantly improved bacterial adhesion, with long-chain AHLs playing a major role. Additionally, the study observed a wide range of QS bacterial threshold and significant differences in QS response time to AHLs in different biofilms.
Article
Microbiology
Chen Cai, Gaofeng Ni, Jun Xia, Xueqin Zhang, Yue Zheng, Bingqing He, Esteban Marcellin, Weiwei Li, Jiaoyang Pu, Zhiguo Yuan, Shihu Hu
Summary: This study reveals that the ANME archaeon Ca. M. nitroreducens TS is capable of carrying out long-term Fe(III)-dependent AOM and may reduce Fe(III) via EET. The decline and replacement of Ca. M. nitroreducens TS by Ca. M. ferrireducens suggests niche differentiation between these two ANME archaea.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Chemistry, Physical
Hesamoddin Rabiee, Lei Ge, Jing Zhao, Xueqin Zhang, Mengran Li, Shihu Hu, Simon Smart, Thomas E. Rufford, Zhonghua Zhu, Hao Wang
Summary: This study introduces a new strategy to regulate wettability for enhancing CO2RR efficiency by creating hydrophilic-hydrophobic regions within the catalyst layer. The regulated electrode shows higher catalyst utilization and formate partial current density compared to untreated electrodes, outperforming other methods.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Xueqin Zhang, Hesamoddin Rabiee, Gaofeng Ni, Joshua Frank, Jing Zhao, Chen Cai, Bernardino Virdis, Zhiguo Yuan, Shihu Hu
Summary: Bioelectrochemical methane oxidation can be improved by using a special methanotrophic consortium to assemble conductive reduced graphene oxide on hollow fibers, resulting in enhanced current output. This strategy can be applied to other bioelectrochemical systems with low solubility issues.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xueqin Zhang, Simon J. McIlroy, Igor Vassilev, Hesamoddin Rabiee, Manuel Plan, Chen Cai, Bernardino Virdis, Gene W. Tyson, Zhiguo Yuan, Shihu Hu
Summary: Anaerobic oxidation of methane (AOM) is an important microbial process that reduces methane emissions from natural sediments. In this study, a microbial consortium in a methane-fed microbial electrolysis cell (MEC) was investigated, and acetate was identified as a likely intermediate for methane oxidation. The oxidation of intracellular polyhydroxybutyrate (PHB) and breakdown of extracellular polymeric substances (EPSs) were found to contribute to current generation in the absence of methane.
Article
Biotechnology & Applied Microbiology
Hua-Jun Feng, Long Chen, Xian-Bin Ying, Sheng-Song Yu, Yang-Cheng Ding
Summary: The effects of PAC with different redox properties on membrane fouling were investigated, and it was found that PAC with reductive properties could prolong the filtration cycle and enhance the anti-fouling performance mainly by reducing the content of extracellular polymer substances and soluble microbial products in the solution.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Hua-Jun Feng, Long Chen, Yang-Cheng Ding, Xiang-Juan Ma, Seow-Wah How, Di Wu
Summary: The application of biological methods in industrial saline wastewater treatment is limited due to the inhibitory effect of highly concentrated salts on microbial activity. Acclimatized halotolerant and halophilic microorganisms play a key role in resisting high salinity. Electrical stimulation has been shown to enhance microbial salt tolerance and pollutant removal ability, but a comprehensive understanding of the underlying mechanisms is lacking.
BIOELECTROCHEMISTRY
(2022)
Article
Environmental Sciences
Yangcheng Ding, Jinglong Han, Huajun Feng, Yuxiang Liang, Wenli Jiang, Shuhao Liu, Bin Liang, Meizhen Wang, Zhiling Li, Aijie Wang, Nanqi Ren
Summary: The study demonstrated that advanced reduction process with UV/sulfite system can effectively degrade halogenated antibiotics like florfenicol, preventing the proliferation and transmission of related antibiotic resistance genes in the subsequent biotreatment process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zhetai Hu, Min Zheng, Shihu Hu, Pei-Ying Hong, Xueqing Zhang, Veljko Prodanovic, Kefeng Zhang, Ilje Pikaar, Liu Ye, Ana Deletic, Zhiguo Yuan
Summary: This study demonstrates that electrochemical generation of iron is a viable alternative to the use of iron salts in wastewater treatment. The use of electrochemical iron significantly reduces sulfide concentration and membrane fouling, while increasing removal efficiencies of various pollutants. The economic analysis shows that electrochemical iron is cost-effective compared to the conventional method of using iron salts.
Article
Microbiology
Simon J. J. McIlroy, Andy O. O. Leu, Xueqin Zhang, Rhys Newell, Ben J. J. Woodcroft, Zhiguo Yuan, Shihu Hu, Gene W. W. Tyson
Summary: In this study, a bio-reactor dominated by 'Candidatus Methanoperedens nitroreducens' was characterized using meta-omics and fluorescence in situ hybridization (FISH). Unexpectedly, two morphotypes of 'Ca. M. nitroreducens', coccobacilli microcolonies and planktonic rods, were found to stably co-exist. Genomically identical but distinct in gene expression profiles for carbon metabolism, motility, and cell division were observed in these morphotypes. Additionally, a third phenotype that stored carbon as polyhydroxyalkanoates was observed in some coccobacilli 'Ca. M. nitroreducens'. The phenotypic variation of 'Ca. M. nitroreducens' likely aids their survival and dispersal in sub-optimal environmental conditions.
NATURE MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Shuangjing Dong, Yangcheng Ding, Huajun Feng, Jixiao Xu, Jinglong Han, Wenli Jiang, Yijing Xia, Aijie Wang
Summary: To eliminate the antibacterial activity of target antibiotics in wastewater, effective abiotic pre-treatment methods are necessary. The VUV/UV/sulfite system demonstrated high decomposition rate and defluorination, effectively eliminating the antibacterial activity of florfenicol. It also efficiently prevented the abundance of antibiotic resistance genes and integrons in the subsequent biotreatment process.
Article
Chemistry, Physical
Hesamoddin Rabiee, James K. Heffernan, Lei Ge, Xueqin Zhang, Penghui Yan, Esteban Marcellin, Shihu Hu, Zhonghua Zhu, Hao Wang, Zhiguo Yuan
Summary: Electrochemical carbon monoxide reduction (CORR) to C2+ products is advantageous over electrochemical CO2 conversion (CO2RR) due to its stability in alkaline solutions. However, CORR faces challenges such as mass transport resistance and lower aqueous CO solubility. In this study, Cu-based hollow fiber gas-diffusion electrodes (HFGDEs) were tuned for CORR, resulting in highly selective C2+ products, particularly ethylene. The electrodes achieved one of the highest partial current densities for ethylene production, demonstrating the potential of hollow fiber configuration for other gas-phase electrochemical reactions with low solubility.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Joshua Frank, Xueqin Zhang, Esteban Marcellin, Zhiguo Yuan, Shihu Hu
Summary: Nitrate-dependent anaerobic methane oxidation is a microbial process that has ecological significance for global methane mitigation and application potential for wastewater treatment. This study investigated the physiological responses of a freshwater consortium dominated by 'Candidatus Methanoperedens nitroreducens' to different salinities. The results showed that the target organism had higher tolerance to high salinity stress and that the activities of nitrate reduction and methane oxidation were significantly affected by salt stress. The study also identified a new syntrophic relationship between 'Ca. M. nitroreducens' and denitrifying populations under marine salinity conditions. The findings have important implications for the ecological distribution of the nitrate-dependent AOM process in marine environments and the potential of this biotechnological process for the treatment of high-salinity industrial wastewater.
Article
Multidisciplinary Sciences
Xueqin Zhang, Georgina H. Joyce, Andy O. Leu, Jing Zhao, Hesamoddin Rabiee, Bernardino Virdis, Gene W. Tyson, Zhiguo Yuan, Simon J. Mcilroy, Shihu Hu
Summary: Anaerobic methanotrophic archaea (ANME) use multi-heme c-type cytochromes (MHCs) to mediate the reduction of metals and electrodes. Experimental evidence supports the involvement of these cytochromes in extracellular electron transfer (EET) from ANME to different electron sinks.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Huajun Feng, Wei Guo, Xianbin Ying, Xiangjuan Ma, Anan Jin, Zhejiang Hong, Yangcheng Ding, Nannan Zhao, Yifeng Zhang
Summary: This study investigated the succession pattern and electron transfer mechanism of inverted denitrifying biocathode. The highest current density of the inverted biocathode was found to be twice that of the steady current density, and the dominant flora of the electrode biofilm shifted from Geobacter sp. to denitrifying bacteria. The decreased content of cytochrome C and the presence of iron-containing compounds were identified as factors contributing to enhanced extracellular electron transfer (EET) during denitrification.
Article
Engineering, Environmental
Xueqin Zhang, Mengying Xie, Chen Cai, Hesamoddin Rabiee, Zhiyao Wang, Bernardino Virdis, Gene W. Tyson, Simon J. McIlroy, Zhiguo Yuan, Shihu Hu
Summary: This study demonstrates the role of pyrogenic carbon (PC) in mitigating greenhouse gas emissions by promoting Fe(III)-dependent anaerobic oxidation of methane (AOM). PC enhances the AOM rate and Fe(III) reduction through electron transfer mechanisms. The findings highlight the potential of PC-facilitated Fe(III)-dependent AOM in reducing methane emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(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.
