Article
Engineering, Chemical
Sijia Lu, Xiaoliang Li, Xing Zheng, Gang Tang, Tong Liu, Yanchun Ke, Bao Liu, Hua Wu
Summary: A PbO2 plate electrode was synthesized and optimized for the electrochemical treatment of waste activated sludge. The electrochemical treatment improved the dewaterability and reduced the concentration of suspended solids in the sludge. The use of chemically reduced graphene oxide (RGO) modified PbO2 electrode enhanced the production of hydroxyl radicals (& BULL;OH) and improved the removal of sludge components. The addition of NaCl improved the electrochemical performance of sludge treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Tian Qin, Bin Yao, Yaoyu Zhou, Chuchu Wu, Changwu Li, Ziyi Ye, Dan Zhi, Su Shiung Lam
Summary: This paper provides a comprehensive review of the application of three-dimensional electrochemical advanced oxidation processes for wastewater treatment. It covers the mechanism, reactor design, electrode materials, operational parameters, and application cases of this process. The current limitations and development recommendations are also discussed.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Environmental Sciences
Jinsong Ma, Ming Gao, Huimin Shi, Jin Ni, Yuansheng Xu, Qunhui Wang
Summary: This paper comprehensively reviews the research and development of particle electrodes in 3D electrochemical reactors for wastewater treatment. The roles of particle electrodes in the 3D electrochemical treatment of wastewater are thoroughly investigated and systematized, and different types of particle electrodes are classified and evaluated.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Agricultural Engineering
Zhen-Yu Wu, Juan Xu, Lan Wu, Bing-Jie Ni
Summary: Three-dimensional biofilm electrode reactors (3D-BERs) are highly efficient in refractory wastewater treatment, utilizing filled particle electrodes as both electrodes and microbial carriers. The synergy between electricity and microorganisms is emphasized, along with a systematic summary of electrode materials, including critical particle electrodes. The configurations of 3D-BERs, integration with wastewater treatment reactors, and adaptation to various types of wastewater are discussed, highlighting the prospects and challenges for future research and application.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
S. Mahesh, K. S. Shivaprasad, Mahesh Sanjana
Summary: The goal of this research was to remove COD, oil and grease, and color from raw ayurvedic hospital wastewater using a novel electrochemical coagulation process. The results showed that the use of iron electrodes in the FCC process exhibited the highest pollutant removal efficiency.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Jinsong Ma, Ming Gao, Qin Liu, Qunhui Wang
Summary: In this study, Mn-Co/GAC particle electrode was prepared and used in a three-dimensional electrochemical system for the mineralization of amoxicillin wastewater. Mn and Co catalysts were successfully loaded onto GAC, resulting in enhanced electrocatalytic ability. The optimized operating parameters of current density, electrolyte concentration, particle electrode dosage, and treatment time led to high TOC removal rate and low electrical energy consumption.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Chen Yang, Tong Liu, Nan Chen, Shuang Tong, Yang Deng, Lijing Xue, Weiwu Hu, Chuanping Feng
Summary: Woodchip biofilm electrode reactor (WBER) with woodchips embedded anode and cathode showed high denitrification efficiency and low energy consumption, providing a theoretical basis and direction for further development of bioelectrochemical reactors.
Article
Environmental Sciences
Yingxin Zhao, Xiaojie Qiu, Zehao Ma, Cailian Zhao, Zhuoran Li, Siyuan Zhai
Summary: This study successfully fabricated an efficient Pd/sludge-biochar loaded foam nickel electrode, which exhibited remarkable electrocatalytic performance for 4-chlorophenol degradation. The electrode showed superior reusability and achieved high removal efficiency of 4-CP. Mechanism analysis revealed the generation and utilization of active hydrogen species during the degradation process, and proposed plausible degradation intermediates and pathway for 4-CP electrochemical degradation.
ENVIRONMENTAL RESEARCH
(2022)
Review
Engineering, Chemical
Xu Ren, Peixin Tang, Linghan Xu, Qiaoyun Zhang, Kai Song, Zhicheng Pan
Summary: This study provides a review of 3-dimensional electrochemical reactors (3DERs) and their applications in treating refractory organic wastewater. The preparation techniques for highly efficient particle electrodes (PEs), which are the core of 3DER, are highlighted. Carbon-based, metal-based, and composite PEs materials are discussed in detail, and their potential applications in refractory organic wastewater treatment are summarized.
DESALINATION AND WATER TREATMENT
(2022)
Review
Environmental Sciences
Jinsong Ma, Xiaona Wang, Haishu Sun, Weiqi Tang, Qunhui Wang
Summary: The potential genotoxicity and non-biodegradability of antibiotics in natural water bodies pose a threat to the survival of various organisms and cause severe environmental pollution. Three-dimensional (3D) electrochemical technology has emerged as a promising approach for antibiotic wastewater treatment. This review provides a comprehensive investigation of the use of 3D electrochemical technology in treating antibiotic wastewater, including reactor structure, electrode materials, operating parameters, reaction mechanism, and combination with other technologies. The selection of electrode materials, especially particle electrodes, significantly affects the treatment efficiency. Operating parameters such as cell voltage, solution pH, and electrolyte concentration play a crucial role. Combining 3D electrochemical technology with membrane and biological technologies effectively enhances antibiotic removal and mineralization efficiency. In conclusion, 3D electrochemical technology shows great potential for antibiotic wastewater treatment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Michael Abt, Matthias Franzreb, Mirco Jestaedt, Andre Tschoepe
Summary: Enzymes, as green biocatalysts, provide new synthesis routes for more efficient and direct processes. Combining enzymatic and electrochemical reactions can generate expensive co-factors for enzymes. In this study, a three-phase fluidized bed electrochemical reactor was developed for in-situ delivery of substrates for electro-enzymatic syntheses. The reactor showed high performance in generating H2O2, a co-factor for hydroxylation reactions, with space time yields of up to 10.47 g/(Led) and current efficiencies of up to 57.0%. The fluidized bed electrode reactor offers excellent mixing and mass transfer properties, making it suitable for integrated enzyme-electrochemical systems.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Hui-Shan Meng, Yang Liu, Peng-Xi Liu, Lu-Lu Zhou, Chen Chen, Wei-Kang Wang, Juan Xu
Summary: A novel three-dimensional photoelectrocatalytic reactor (3D-PER) has been developed to degrade Rhodamine B (RhB) simulated wastewater. The granular sewage sludge carbons (GSCs) used in the reactor as particle catalysts exert both photocatalysis and electrocatalysis, achieving over 95% decolorization efficiency. The study identifies the contributions of photocatalysis and electrocatalysis to RhB degradation, with photocatalysis primarily initiating decolorization and electrocatalysis playing a critical role in mineralization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Siming Lei, Yonghui Song
Summary: The electrochemical treatment of wastewater using 2D and 3D systems showed that the applied voltage and main electrode material significantly affected the removal of ions. The 3D system, with granular activated carbon as the particle electrode and carbon-filled stainless mesh and coal-based electrodes as the main electrodes, demonstrated superior treatment effects compared to the 2D system.
FRONTIERS IN CHEMISTRY
(2021)
Article
Environmental Sciences
Mohammad Reza Samarghandi, Abdollah Dargahi, Alireza Rahmani, Amir Shabanloo, Amin Ansari, Davood Nematollahi
Summary: In this study, a three-dimensional electrochemical reactor with Ti/SnO2-Sb/beta-PbO2 anode and granular activated carbon (3DER-GAC) particle electrodes was utilized for the degradation of 2,4-dichlorophenol (2,4-DCP). Process optimization using OCCD and GA led to the development of a robust quadratic model for predicting the removal efficiency of 2,4-DCP. Under optimal conditions, the 3DER-GAC system showed significantly higher removal efficiency compared to a separate electrochemical degradation process, with efficient energy consumption.
Article
Environmental Sciences
Shuming Xie, Mei Li, Yexin Liao, Qin Qin, Shouxiang Sun, Yunhong Tan
Summary: A biochar-loaded particle electrode was prepared using an in-situ method for effectively degrading 4-chlorophenol in wastewater. The supported biomass carbon particle electrode showed significantly higher degradation efficiency compared to the unsupported one. Different loading and concentration of biomass carbon particle electrodes greatly influenced the electrochemical degradation of 4-chlorophenol, with Mn/AC > Sn/AC > Sb/AC showing the best removal efficiencies.
Review
Biotechnology & Applied Microbiology
Jin Li, Yuanyuan Gao, Huiyu Dong, Guo-Ping Sheng
Summary: This review provides a comprehensive overview of the metabolic versatility of Haloarchaea in hypersaline wastewater treatment, as well as their potential and strategies in coping with salt stress.
TRENDS IN BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Han-Chao Zhang, Zhan-Xiao Kang, Jiang-Jin Han, Peng Wang, Jin-Tu Fan, Guo-Ping Sheng
Summary: A photothermal nanoconfinement reactor (PNCR) system using hollow carbon nanospheres (HCNs) was developed to enhance chemical reaction performance. By concentrating heat and inhibiting heat loss, the local temperature inside the HCNs' void space was significantly higher than the bulk solution temperature under light irradiation. The degradation rate of sulfamethoxazole in the PNCR system was found to be 7.1 times higher than that without nanoconfinement, indicating the efficiency improvement. Furthermore, the high-quality local heat within the nanoconfined space was shown to alter the reaction pathway from non-radical to radical-based. This work provides a novel strategy for locally high-temperature production with potential applications in energy and environmental fields.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Mei-Mei Wang, Li-Juan Liu, Jia-Rui Xi, Ying Ding, Peng-Xi Liu, Liang Mao, Bing-Jie Ni, Wei-Kang Wang, Juan Xu
Summary: In this study, novel oxygen vacancies-enriched hollow ZnCo2O4 nanocages were synthesized for efficient peroxydisulfate activation. The incorporation of Zn into the lattice of Co3O4 increased the number of oxygen vacancies while preserving the morphology of the catalysts. The developed activation system showed resistance to environmental concentrations of Cl-, NO(3)(-), and humic acid, and demonstrated potential in the treatment of packaging wastewater with low ionic potential organic pollutants.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Manman Zhang, Yuanting Li, Bowen Yang, Yinglong Su, Juan Xu, Jingjing Deng, Tianshu Zhou
Summary: By using an alkali post-treatment method, a fluffed hybrid-cobalt core-shell nanocatalyst was created for the degradation of bisphenol A (BPA) with high efficiency. The presence of acetate ions (Ac-) promoted the degradation of BPA, especially in food waste leachate where 100% removal was achieved. The magnetic core of the nanocatalyst allowed for easy recycling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Han-Chao Zhang, Pei-Xin Cui, Dong-Hua Xie, Yu-Jun Wang, Peng Wang, Guo-Ping Sheng
Summary: Studying the relationship between structure and activity in bio-enzymes is important for designing nanozymes for energy and environmental applications. In this study, Fe single-atom nanozymes (Fe-SANs) with Fe-N-5 site, inspired by cytochromes P450 (CYPs), have been developed and characterized. The Fe-SANs exhibit excellent activity and selectivity in the oxidation of sulfamethoxazole, a typical antibiotic contaminant.
Article
Chemistry, Analytical
Junxuan Zhu, Jiacheng Li, Miao Xu, Bowen Yang, Yiling Zhang, Juan Xu, Guoyue Shi, Tianshu Zhou, Jingjing Deng
Summary: In this study, a dual-mode colorimetric and fluorometric assay for phosphate ions (Pi) and multi-responsive coffee ring chips were proposed based on guest-functionalized infinite coordination polymers (ICPs). The ICPs exhibited purple-blue color and blue fluorescence, which changed to purple-red and orange-red, respectively, in the presence of Pi, enabling dual-mode Pi detection. Additionally, the coffee ring deposition pattern on the glass substrate reflected the changes in surface wettability/size/amount of ICPs, providing a signal readout for multi-responsive coffee ring chips.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Wei-Kang Wang, Lu-Lu Zhou, Hong-Yang Cao, Peng-Xi Liu, Xiu-Yan Li, Mamoru Fujitsuka, Juan Xu, Tetsuro Majima
Summary: In this study, self-interspersed porous nanoplates assembled WO3 catalysts were synthesized without templates and demonstrated excellent photoelectrocatalytic activity and stability. The degradation efficiency of bisphenol A in the photoelectrocatalytic system was significantly higher than that in photocatalysis and electrocatalysis systems. The two-dimensional porous structure and self-interspersed arrangement improved the specific surface area and provided more catalytic sites, while promoting efficient charge separation. Hydroxyl radicals were identified as the predominant reactive oxygen species in the developed photoelectrocatalytic system.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Wen-Yuan Fan, Xin Zhang, Pu-Can Guo, Guo-Ping Sheng
Summary: Phosphonates, an important organic phosphorus in wastewater, are difficult to remove using traditional biological treatments. This study found that ferrate can effectively remove phosphonates through oxidation and in-situ coagulation under near-neutral conditions. The ferrate-induced release of phosphate facilitated the removal of total phosphorus, with coagulation removal reaching up to 90% within 10 minutes. This work provides an efficient method for treating phosphonate-containing wastewaters.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Xiaofang Yan, Jing Sun, Yizhen Wang, Zisha Zhang, Chuning Zhang, Wei Li, Juan Xu, Xiaohu Dai, Bing-Jie Ni
Summary: The study explored the use of low-dose ferrate (Fe(VI)) for destroying the structure of sewer biofilms, aiming to enhance the efficiency of biofilm control. The results showed that the biofilm structure started to deteriorate at a Fe(VI) dosage of 15 mg Fe(VI)/L and was further damaged with increasing dosage. Fe(VI) treatment mainly reduced the content of humic substances (HS) in biofilm extracellular polymeric substances (EPS), resulting in a looser biofilm structure. XDLVO analysis indicated that the treated biofilm was less likely to aggregate and easier to be removed by shear stress. Combined dosing experiments with Fe(VI) and free nitrous acid (FNA) showed considerable reduction in FNA dosing rate and exposure time, leading to a substantial decrease in cost. The study suggests that low-rate Fe(VI) dosing for biofilm structure destruction is an economical way to facilitate sewer biofilm control.
Article
Engineering, Environmental
Chuan-Wang Yang, Xin Zhang, Li Yuan, Yun-Kun Wang, Guo-Ping Sheng
Summary: Although SERS is a promising technology for sensitive detection of environmental pollutants, its performance can be greatly affected by the environmental matrix. This study investigated the matrix effect of natural waters on SERS analysis and identified natural organic matter (NOM) as the main contributor to the matrix effect. The microheterogeneous repartition of analytes by NOM was found to play the dominating role in interfering with SERS detection.
Article
Environmental Sciences
Zi-Run Yan, Yang Liu, Yu-Ying Zhu, Wei Zhang, Juan Xu, Guo-Ping Sheng
Summary: In this study, the binding interactions between microbial extracellular polymeric substances (EPS) and the antibiotic sulfamethoxazole (SMX) were probed using biolayer interferometry (BLI). The influence of environmental conditions on the binding interaction was investigated, and the results showed that acidic conditions, higher ionic strength, and lower temperature favored stronger binding between EPS and SMX. BLI analysis allowed for multichannel operations concurrently, reducing testing time. The developed BLI approach provides a powerful tool for probing binding interactions in complex environmental samples.
Article
Engineering, Environmental
Hui-Shan Meng, Shu-Zhen He, Mei-Mei Wang, Jia-Rui Xi, Jia-Tai Wen, Hong-Wei Luo, Wei-Kang Wang, Juan Xu
Summary: A persulfate activation cell (PAC) is developed by spatially separating pollutants and persulfate, and a CuCoNi-NF catalyst is used as the electrode of the PAC. The PAC shows superior stability compared to a mixed persulfate activation system (PAM) and exhibits high degradation efficiency for phenolic pollutants.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Mu-Cen Yao, Xin Zhang, Qi Huang, Jie Huang, Guo-Ping Sheng
Summary: Compared to individual UV or chlorine disinfection, the combined UV and chlorine (i.e., UV/chlorine) can substantially promote the degradation of antibiotic resistance genes (ARGs) in the effluent by generating radicals. However, the mechanisms of ARG degradation induced by radicals during UV/chlorine treatment remain largely unknown, limiting further enhancement of ARG degradation by process optimization.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Environmental Sciences
Hongwei Luo, Chaolin Tu, Dongqin He, Anping Zhang, Jianqiang Sun, Jun Li, Juan Xu, Xiangliang Pan
Summary: This comprehensive review summarizes the aging process of microplastics (MPs) and the factors that impact their aging, and discusses the effects of aging on the interaction of MPs with contaminants. The review also outlines a range of characterization methods that elucidate the mechanistic processes of these interactions. The rate and extent of MPs aging are influenced by their physicochemical properties and other environmental factors, which ultimately affect the adsorption and aggregation of aged MPs with environmental contaminants.
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.
