Article
Environmental Sciences
Gang Wang, Quancheng Shu, Yuliang Zhu, Yucan Liu, Xiaoyong Yang, Daishun Wu, Hongwei Sun
Summary: This study systematically investigated the efficiency and mechanism of thermally activated persulfate (TAP) oxidation technology in improving the dewatering performance of surplus activated sludge. The results showed that the TAP treatment significantly increased the filterability and decreased the particle size of the sludge. Additionally, it facilitated the disintegration of sludge and conversion of certain EPS components. The findings of this study provide insights into the mechanism of TAP process in enhancing sludge dewatering performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Agricultural Engineering
Pengfei Wan, Ying Liu, Quandi Zhang, Li Jiang, Heping Chen, Wenzhou Lv
Summary: Candida Tropicalis was used to improve the dewaterability of activated sludge (AS) by degrading EPS in AS, resulting in a decrease in protein, polysaccharide, and hydrophilic amino acids in EPS. The yeast degraded macromolecular organics into smaller molecular ones and direct addition of yeast to AS was more effective in EPS degradation. Addition of 0.75 g/L of wet yeast cells and 24 h of aeration enhanced the dewaterability of AS with a reduction in CST and MLSS. After 30 days of operation, lab-scale continuous SBRs reduced CST and MLSS of AS. FTIR spectroscopy showed a decrease in hydrophilic functional groups. This study presents a new approach for in-situ reduction of AS in wastewater treatment plants.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xiaoying Liu, Jie Liu, Dongkun Deng, Renjie Li, Chao Guo, Jinxia Ma, Ming Chen
Summary: The study revealed a positive correlation between EPS content and sludge granulation, with increased protein concentration facilitating microbial aggregation and sludge granulation. Environmental factors affect the properties of EPS, with different types of sludge generating varying levels of EPS and protein concentrations.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
You Ma, Pei-Kun Yuan, Yu Wu, Han Meng, Guo-Xiang Wang, Wen-Ming Xie, Li-Min Zhang, Jie Ma, Yan Xiao
Summary: This study investigated the role of main components of extracellular polymeric substances (EPS) in antibiotic adsorption through enzymatic treatment of activated sludge. The results showed that proteinase K and alpha-amylase can efficiently hydrolyze the proteins and polysaccharides of EPS, significantly enhancing the adsorption capacity of activated sludge for antibiotics. A multivariable linear regression model was successfully developed to quantify the impact of EPS components on antibiotic adsorption.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
You Ma, Pei-Kun Yuan, Yu Wu, Xin-Ying Cheng, Han Meng, Huan He, Guo-Xiang Wang, Xue-Ming Chen, Wen-Ming Xie, Li-Min Zhang
Summary: The study found that removing EPS from activated sludge can increase the adsorption capacity for TMP at environmentally relevant concentrations.
Article
Environmental Sciences
Antonio Melo, Joana Costa, Cristina Quintelas, Eugenio C. Ferreira, Daniela P. Mesquita
Summary: The study compared biomass stress-responses under long-term exposure to ibuprofen and found that IBU significantly reduced the removal efficiencies of COD and NH4+, while the composition of EPS also changed, with higher protein content in TBEPS during phases containing IBU.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Xinyi Zhang, Bin Zhao, Qiang An, Peng Zhang
Summary: This study found that nitrate promotes aerobic granular sludge (AGS) granulation, but long-term addition of nitrate leads to granular disintegration. Nitrate stimulates the secretion of extracellular polymeric substances (EPS), especially proteins, promoting granulation, but excessive EPS can cause disintegration. Nitrate also alters the physicochemical properties of EPS, further affecting granulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Xuan Gao, Kun Yang, Daohui Lin
Summary: The presence of extracellular polymeric substance (EPS) affects the interfacial interaction between titanium dioxide nanoparticles (nTiO(2)) and algae, promoting surface accumulation of nanoparticles on algal cells while limiting their internalization. The different endocytosis pathways for anatase nTiO(2) and rutile nTiO(2) entering algal cells may be attributed to their affinities to mediating receptors. EPS removal activates mediating pathways, facilitating more nanoparticle internalization.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Tianran Ye, Ao Yang, Yulai Wang, Na Song, Ping Wang, Huacheng Xu
Summary: This study investigates the response of extracellular polymeric substances (EPS) in Microcystis aeruginosa to microplastics (MPs). The results show that MPs can inhibit the growth of Microcystis, but enhance the secretion of EPS. The organic composition in EPS varies differently in response to MP exposure, leading to changes in the dominant components and potential ecotoxicological risk. These findings contribute to our understanding of the interaction between phytoplankton and MPs in aquatic environments.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
You Ma, Tian -Yu Li, Han Meng, Guo-Xiang Wang, Li-Min Zhang, Guo-Zheng Jia, Jie Ma, Yan Xiao, Wei-Hua Li, Wen-Ming Xie
Summary: This study investigated the adsorption of the antibiotic trimethoprim (TMP) by extracellular polymeric substances (EPS) in anaerobic activated sludge. The results showed that loosely-bound EPS had a positive effect on TMP adsorption, while tightly-bound EPS had a negative effect.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Peng Yang, Dandan Li, Weijun Zhang, Jing Ai, Sainan Peng, Dongsheng Wang, Fengguo Cui
Summary: The study demonstrated that organic acids chelated ferrous ions can significantly enhance sludge dewaterability, leading to improved dewatering performance through the activation of NaClO.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Qing-Long Fu, Chun-Jie Zhong, Ting Qing, Zi-Yan Du, Cheng-Cheng-Li, Jun-Jie Fei, Willie J. G. M. Peijnenburg
Summary: The study found that the biological impacts of metallic Ag-NPs and silver sulfide nanparticles (Ag2S-NPs) depend on their form and are highly influenced by microbial EPS. Compared to Ag-NPs, Ag2S-NPs have less impact on plants, while Bacillus subtilis EPS significantly alleviates the phytotoxicity of Ag-NPs.
Article
Energy & Fuels
Reza Shokoohi, Dostmorad Zafari, Mohammad Taghi Samadi, Seyed Amir Ghiasian, Mohammad Yousef Alikhani, Sara Mahdian, Mohammad Molla Mahmoudi
Summary: In this study, a filamentous fungus Penicillium rubens was isolated from sewage sludge and its effectiveness in enhancing sludge dewaterability was evaluated. The results showed that inoculating fungal mycelium into sterilized sludge significantly improved sludge dewaterability by reducing SRF and CST values. The degradation of extracellular polymeric substances by the fungal mycelium was responsible for the improved dewaterability. The treated sludge also exhibited reduced slime and loosely bound EPS. The CST and SRF of the fungal-treated sludge were positively correlated with S-EPS and LB-EPS.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Geochemistry & Geophysics
Ming Zhang, Caroline L. Peacock, Peng Cai, Ke-Qing Xiao, Chenchen Qu, Yichao Wu, Qiaoyun Huang
Summary: Recent research has shown that microbially-derived compounds, particularly extracellular polymeric substances (EPS), play a significant role in the soil organic matter pool. The interaction between EPS and soil minerals affects the sorption and selective retention of EPS constituents. The study investigates the EPS association pathways with ferrihydrite and their impact on the mobility and fate of microbially-derived organic matter in soil environments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Tao He, Jing-Qiu Hua, Rong-Ping Chen, Lei Yu
Summary: This study explored the adsorption capacity of Klebsiella oxytoca, a dye-degrading and EPS-producing strain, to methylene blue. The results showed that EPS played a significant role in the adsorption of MB dye.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Chemistry, Physical
Anqi Li, Xiaoli Xin, Tingting Zhang, Tao Xu, Luo Li, Chang Liu, Weihua Li, Jiansheng Li, Yi Li, Rui Lu
Summary: In this study, a two-dimensional PA-Ag@C film substrate was fabricated by electrostatic deposition of carbon-coated silver nanoparticles on polyamide films. The substrate shows improved sensitivity and stability in complex water samples by adjusting the pH of the system.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Engineering, Environmental
Chen Wang, Wei Wei, Yu-Ting Zhang, Xueming Chen, Bing-Jie Ni
Summary: This study proposes a strategy for mitigating the inhibitory effects of microplastics (MPs) and nanoplastics (NPs) on anaerobic granular sludge (AGS) in wastewater treatment. The strategy involves using coconut shell-derived hydrochar to efficiently capture the existing PVC-MPs and PVC-NPs from AGS. The hydrochar increases methane production and enhances the protective capabilities of AGS against the negative effects of PVC-MPs and PVC-NPs. The hydrochar also has stronger adsorption capability for PVC-MPs and PVC-NPs compared to AGS. The findings demonstrate that hydrochar effectively alleviates the suppression on AGS caused by PVC-MPs and PVC-NPs, providing a novel strategy for improving wastewater treatment performance under the stress of microplastics and nanoplastics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Tianyi Luo, Xiaohu Dai, Zhijie Chen, Lan Wu, Wei Wei, Qiuxiang Xu, Bing-Jie Ni
Summary: This study reveals that polyethylene (PE) and polyvinyl chloride (PVC) microplastics (MPs) have different impacts on the abundance and dissemination of antibiotic resistance genes (ARGs) and antibiotic-resistant bacteria (ARB) in anaerobic sludge digestion. PVC MPs promote the acquisition of ARGs by human pathogen bacteria and functional microorganisms, while PE MPs do not. Horizontal gene flow (HGF) is observed to be a possible mechanism for new bacteria to acquire ARGs in MPs-stressed digester.
Review
Nanoscience & Nanotechnology
Zhijie Chen, Sining Yun, Lan Wu, Jiaqi Zhang, Xingdong Shi, Wei Wei, Yiwen Liu, Renji Zheng, Ning Han, Bing-Jie Ni
Summary: The utilization of waste-derived catalysts significantly promotes the sustainable production of green hydrogen through water electrolysis. In this review, recent achievements in waste-derived electrocatalysts for water electrolysis are systematically examined. The principles of water electrolysis and the design principles of efficient electrocatalysts are discussed, followed by current strategies for transforming waste into electrocatalysts. Applications of waste-derived catalysts in hydrogen evolution reaction, oxygen evolution reaction, and overall water electrolysis are reviewed, with a focus on the structure-performance relationship of the catalysts. Challenges and research directions in this field are highlighted, aiming to accelerate the development of the circular economy-driven green hydrogen energy scheme.
NANO-MICRO LETTERS
(2023)
Article
Environmental Sciences
Yifeng Xu, Ying Gu, Lai Peng, Ning Wang, Shi Chen, Chuanzhou Liang, Yiwen Liu, Bing-Jie Ni
Summary: Although moving bed biofilm reactors (MBBRs) have shown excellent antibiotic removal potentials, the mechanisms underlying this process are still not well understood. This study investigated the removal of ciprofloxacin in an enriched nitrifying MBBR, revealing the significant contributions of biomass adsorption and microbial-induced biodegradation. The results showed that the presence of ammonium enhanced the biodegradation rate through ammonia oxidizing bacteria (AOB)-induced cometabolism, while heterotrophs played a minor role in ciprofloxacin biodegradation. The findings suggest the feasibility of nitrifying biofilm systems for efficient antibiotic removal from wastewater.
Article
Environmental Sciences
Chen Wang, Yun Wang, Zhijie Chen, Wei Wei, Xueming Chen, Giorgio Mannina, Bing-Jie Ni
Summary: The development and use of new and renewable energy sources are urgently needed as the global energy crisis is approaching due to rapid population growth and overexploitation of fossil fuels. This study developed a novel technology to efficiently produce renewable liquid bioenergy from discarded wastes, by transforming sewage sludge into high-value medium chain fatty acids (MCFA). The use of free nitrous acid (FNA) pretreatment significantly increased the yield of MCFA in the anaerobic sludge fermentation process. However, direct addition of FNA inhibited the generation of total products due to its toxicity on live cells in the sludge. The study also investigated the mechanism of MCFA promotion by FNA pretreatment and found that it increased MCFA production rate by converting refractory materials into rapidly bioavailable substrates and favoring the growth of microorganisms related to MCFA production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Nanoscience & Nanotechnology
Qing Wang, Ning Han, Zhangfeng Shen, Xue Li, Zhijie Chen, Yue Cao, Weimeng Si, Fagang Wang, Bing-Jie Ni, Vijay Kumar Thakur
Summary: This paper reviews the recent research status of MXene-based electrochemical (bio) sensors for detecting biomarkers, pesticides, and other aspects, and discusses the synthesis strategy and the effect of surface modification on various properties of MXenes.
NANO MATERIALS SCIENCE
(2023)
Article
Environmental Sciences
Xinyan Chen, Dongbo Wang, Wen-Bo Nie, Linyan Yang, Wei Wei, Bing-Jie Ni, Xueming Chen
Summary: In this study, a biofilm model was constructed to investigate the effects of biofilm properties on the start-up process and steady-state performance of the membrane biofilm reactor (MBfR) performing anammox/n-DAMO. The results showed that the initial microbial composition, biofilm thickness, boundary layer thickness, and solute diffusivity in the biofilm structure would not affect the steady-state performance but would significantly regulate the start-up time of the MBfR. Inoculating thin initial biofilms with mainly anammox bacteria or/and n-DAMO archaea could accelerate the start-up process, and reducing the boundary layer thickness and solute diffusivity could enhance methane utilization.
Article
Chemistry, Analytical
Dian Wang, Xiang Wan, Jiafei Wang, Debby Mangelings, Qin Xu, Fazhi Xie, Xianhuai Huang, Weihua Li, Han Xuan, Wensheng Zou, Qishu Qu
Summary: By using a high concentration of tetrabutyl orthotitanate as the titania source, TiO2 can be coated in the pores of the shell of SiO2 core-shell spheres with high TiO2 loading. The experimental results show that the TiO2 coated core-shell spheres can be a good alternative stationary phase for liquid chromatography.
ANALYTICA CHIMICA ACTA
(2023)
Review
Environmental Sciences
Maoshui Zhuo, Zhijie Chen, Xiaoqing Liu, Wei Wei, Yansong Shen, Bing-Jie Ni
Summary: This paper discusses the application of three catalytic processes (photocatalysis, electrocatalysis, and biocatalysis) in the management of microplastic pollution, and introduces the efficiency and catalytic mechanisms of different catalysts. It also proposes the development prospects for sustainable management of microplastic pollution.
ENVIRONMENTAL POLLUTION
(2024)
Article
Environmental Sciences
Yi-Lu Sun, Han-Lin Wang, Huu Hao Ngo, Wenshan Guo, Bing-Jie Ni, Xue-Ning Zhang, Wei Wei
Summary: In this study, a comprehensive methodology was developed to design and operate S0AD bioreactors, effectively managing fluctuations in nitrogen removal efficiency caused by seasonal temperature variations. By establishing a mathematical model and considering influence factors, a pilot-scale bioreactor was designed to maintain a stable effluent nitrate concentration throughout the year, resulting in a substantial reduction in excessive nitrate removal, sulfur consumption, and sulfate production.
ENVIRONMENTAL RESEARCH
(2024)
Review
Green & Sustainable Science & Technology
Jiaqi Zhang, Zhijie Chen, Yiwen Liu, Wei Wei, Bing-Jie Ni
Summary: Hydrogen sulfide (H2S) produced by biofilms and sediments in sewer systems causes odor and corrosion problems, while methane (CH4) production from anaerobic process may lead to sewer explosion and greenhouse gas emission. Iron compounds have been widely used in sewer management due to their effectiveness, non-toxicity, and low cost. This review comprehensively summarizes the redox reactions related to the bio-chemical iron cycle in sewer systems and reviews the effects of iron compounds on the removal of nitrogen, phosphorus, and organic pollutants. It also proposes future research directions for iron-assisted sewer management.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Chemistry, Physical
Seyed Masoud Parsa, Fatemeh Norozpour, Saba Momeni, Shahin Shoeibi, Xiangkang Zeng, Zafar Said, Wenshan Guo, Huu Hao Ngo, Bing-Jie Ni
Summary: The consumption of biologically-contaminated water annually leads to numerous deaths, especially among children in developing countries. Solar-based water desalination systems, with the use of nanomaterials, are considered effective in providing safe drinking water by eliminating biological contaminants. This paper presents a comprehensive review of the effectiveness of nanomaterial-assisted solar stills and solar interfacial evaporators in combating various forms of biological contamination, focusing on viruses and antimicrobial resistance pathogens. The potential transmission routes and importance of AMR pathogens in the environment and water bodies are also discussed.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Amir Hossein Navidpour, Javad Safaei, Guojin Zhang, Amin Mojiri, Bing-Jie Ni, Zhenguo Huang, John L. Zhou
Summary: This research investigated the decomposition of perfluorooctanoic acid (PFOA) using immobilized ZnO nanoparticles through electrophoretic deposition in photocatalysis and photoelectrocatalysis. ZnO nanoparticles show high potential for PFOA degradation due to their process performance, application under visible light exposure, and cost-effectiveness. The study found that the addition of peroxymonosulfate (PMS) could enhance PFOA photocatalytic decomposition over ZnO films, and both UV irradiation and visible light exposure were effective in initiating PFOA degradation. The research also demonstrated the excellent degradation performance of ZnO in photoelectrocatalysis, despite the potential ZnO corrosion caused by PMS.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Chemistry, Multidisciplinary
Zhijie Chen, Wei Wei, Yansong Shen, Bing-Jie Ni
Summary: Valorizing plastic waste into value-added chemicals/fuels in a green manner is a sustainable solution to address the global problem of plastic pollution. A low-cost and highly defective nickel sulfide catalyst has been designed to selectively convert PET monomer into formate, with the co-production of hydrogen fuel. This work provides a cost-effective catalyst for plastic electro-upcycling.
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.
