Article
Biotechnology & Applied Microbiology
Hyun-Kyu Lee, Byung-Moon Jun, Sun-Il Kim, Jong-Soon Song, Tack-Jin Kim, Sungbin Park, Seeun Chang
Summary: The purpose of this study was to remove suspended soil, Sr2+, and Cs+ from soil-washing effluents. The inorganic coagulant J-AF was found to effectively precipitate the suspended soil and remove Sr2+ through adsorption. Additionally, J-AF could precipitate and eliminate Cs+ from the supernatant.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Chemistry, Applied
Jingshu Cui, Xiaojun Niu, Dongqing Zhang, Jinling Ma, Xifen Zhu, Xiaoxian Zheng, Zhang Lin, Mingli Fu
Summary: A novel flocculation strategy using chitosan-amphoteric starch (C-A) dual flocculants was proposed for simultaneously removing Microcystis aeruginosa and algal organic matter (AOM), providing new insights for harmful algal bloom control in an efficient, cost-effective and ecologically friendly way.
CARBOHYDRATE POLYMERS
(2023)
Article
Biochemistry & Molecular Biology
Chuang Liu, Xiaoyu Wang, Sicong Du, Peng Cheng, Wenyan Liang
Summary: Magnetic flocculant (Fe3O4@PP) was synthesized using plant polyphenol (PP) as a shaping ligand via in situ self-assembly. Fe3O4@PP showed excellent turbidity removal efficiency in a wide pH range and initial turbidity range. The formation process of magnetic flocs was influenced by magnetic force, electric charge, van der Waals force, and functional groups on the surface of PP.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Green & Sustainable Science & Technology
Bin Wang, Xue-Fei Cao, Shi-Xin Yu, Zhuo-Hua Sun, Xiao-Jun Shen, Jia-Long Wen, Tong- Qi Yuan
Summary: The complex pollutants in wastewater, particularly the highly toxic and carcinogenic azo-dyes, pose serious threats to water ecosystems and human health. The development of efficient flocculants using renewable lignin is crucial for environmental sustainability. However, the existing preparation process of lignin-based flocculants is inefficient, cumbersome, and environmentally polluting. In this study, a new type of ultra-efficient Mannich-functionalized lignin-based flocculants was successfully prepared using a simple and green strategy.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Linzhu Sun, Yunyun Zheng, Xiaoniu Yu
Summary: The article discusses the key issue of river bottom sediment reduction which is to solve the dewatering of sediments. Different combinations of flocculants and curing agents have been developed to address this issue, and suitable ratios of composite flocculants have been found through experiments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Yuyang Wu, Junyi Jiang, Qiang Sun, Yanyan An, Rui Zhao, Huaili Zheng, Hong Li
Summary: Surface charges of the suspended colloidal particles in water can be either positive or negative. A series of amphoteric starch-based flocculants were successfully synthesized and used for the removal of contaminants with different charges from water. The results showed that these eco-friendly flocculants exhibited high flocculation performance for both kaolin and hematite suspensions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Luminita Ghimici, Maria Magdalena Nafureanu, Marieta Constantin
Summary: Due to their non-toxicity, low price, and biodegradability, modified polysaccharides are increasingly used as flocculants in wastewater treatment. However, pullulan derivatives have been less utilized in wastewater purification processes. This article provides data on the removal of FeO and TiO2 particles from model suspensions using pullulan derivatives with pendant quaternary ammonium salt groups, trimethylammonium propyl carbamate chloride (TMAP(x)-P). The study evaluates the influence of various factors on the separation efficacy, including polymer ionic content, dose, initial solution concentration, dispersion pH and composition. UV-Vis spectroscopy measurements show a high removal efficacy of TMAP(x)-P for FeO particles (around 95% and more), while a lower clarification of TiO2 particles suspension is observed (removal efficiency between 68% and 75%). The zeta potential and particle aggregates size measurements indicate that the charge patch mechanism plays a crucial role in the metal oxide removal process. Surface morphology analysis/EDX data provide additional evidence regarding the separation process. The pullulan derivatives/FeO flocs exhibit good removal efficiency (90%) for Bordeaux mixture particles in simulated wastewater.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Elham Jahedi, Reza Panahi
Summary: Cationic flocculants developed from cellulose fibers extracted from rice husk showed excellent turbidity removal ability in wastewater treatment without the need for conventional coagulants. This method can effectively valorize lignocellulosic wastes and provide a sustainable solution for waste management.
BIORESOURCES AND BIOPROCESSING
(2021)
Article
Chemistry, Applied
Chun Lu, Zuxin Xu, Bin Dong, Yunhui Zhang, Mei Wang, Yifan Zeng, Chen Zhang
Summary: This study developed a prediction model using machine learning to accurately predict the efficiency of heavy metals removal using chitosan-based flocculants. The study identified solution pH and molecular weight as the most dominant parameters influencing flocculation performance.
CARBOHYDRATE POLYMERS
(2022)
Article
Engineering, Chemical
Zhiwei Lin, Chunhui Zhang, Chao Sun, Wenjing Lu, Bingxu Quan, Peidong Su, Xuezhi Li, Tengzhuo Zhang, Junqiang Guo, Weixian Li
Summary: Polymerized ferric sulfate (PFS) was prepared by oxidation-hydrothermal polymerization method, and P-AM-DMDAAC-ODMA (abbreviated as PADO) and iron-based hybrid flocculant (PFADO) were prepared by solution copolymerization method. Various analytical techniques confirmed the successful grafting of each organic monomer onto the copolymer. PFADO achieved high removal rates for turbidity and oil content, and the FTIR and zeta potential results provided insights into the flocculation mechanism.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Radhiatul Atiqah Ramli Shah, Siti Rozaimah Sheikh Abdullah, Hassimi Abu Hasan, Ahmad Razi Othman, Nur 'Izzati Ismail
Summary: This research investigates the use of local plants as biocoagulants in the treatment of coffee effluent. The study found that Piper sarmentosum showed the highest removal of suspended solids and turbidity, making it the most effective biocoagulant.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Eduardo Hermosillo-Ochoa, Lorenzo A. Picos-Corrales, Angel Licea-Claverie
Summary: This study addressed the preparation of environmental friendly flocculants derived from biobased chitosan grafted with biocompatible poly(N-vinylcaprolactam) (PNVCL) and poly(acrylic acid) (PAAc), as well as their evaluation in the removal of turbidity, ciprofloxacin (CIP) and cadmium (Cd(II)) from contaminated water. The results showed that graft copolymers led to better removal of contaminants compared to unmodified chitosan and PNVCL homopolymer, especially at higher temperatures. Flocculants containing both PNVCL and PAAc grafts allowed close to 95% removal of CIP and Cd(II) in single contaminant flocculation experiments.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yongjun Sun, Yuanyuan Yu, Shengbao Zhou, Kinjal J. Shah, Wenquan Sun, Jun Zhai, Huaili Zheng
Summary: In this study, an amphoteric magnetic chitosan-based flocculant was prepared and its flocculation performance and mechanism were investigated. The material showed excellent removal rates of Cu(II) and DB56, and maintained stable performance even after consecutive regeneration/flocculation cycles.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Environmental Sciences
Widad El Bouaidi, Giovanni Libralato, Mountasser Douma, Abdelaziz Ounas, Abdelrani Yaacoubi, Giusy Lofrano, Luisa Albarano, Marco Guida, Mohammed Loudiki
Summary: In recent years, the proliferation of Harmful Cyanobacterial Blooms (CyanoHABs) caused by water eutrophication and climate change has had a significant impact on human health and the environment in relation to water supply. Plant-based coagulants have been studied as an eco-friendly alternative to conventional coagulants in drinking water treatment plants (DWTPs) for the removal of both turbidity and CyanoHABs. While plant-based coagulants have shown efficiency in turbidity removal, their ability to remove cyanobacterial cells is still limited. This paper reviews the application of plant-based coagulants in DWTPs, focusing on turbidity removal, including cyanobacterial cells, and presents their potential use in reducing the harmful effects of cyanobacterial proliferation. The advantages and limitations of green coagulants in DWTPs are discussed, summarizing over 10 years of knowledge.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yimin Sang, Taotao Lu, Xianchun Lu, Shuguang Wang, Xueting Shao, Yanhe Han, Lili Li
Summary: This study investigated the process parameters and mechanism of microsand-ballasted flocculation (MBF) through experiments. The results showed that the optimum operational parameters varied for different wastewater samples. The addition of microsand enhanced the performance of MBF by forming dense micro-floc structures. The size of micro-flocs can be controlled by adjusting the stirring speed.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Boqiang Gao, Yu Pan, Hu Yang
Summary: A novel composite sponge with enhanced performance in synergistic adsorption and photo-Fenton degradation of fluoroquinolones was successfully synthesized by loading a MoS2/Bi2S3/BiVO4 ternary photocatalyst onto a 3D lignosulfonate modified poly(vinyl formal) sponge. The composite sponge exhibited a wide applicable pH range and a reduced dosage of reactants, achieving efficient degradation of multiple fluoroquinolones in water.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Qianqian Chang, Boqiang Gao, Hu Yang
Summary: In this study, a novel composite adsorbent k-TAFe was designed and fabricated using a one-step method. The adsorption performance of k-TAFe in removing fluoroquinolones antibiotics (FQs) from water was systematically investigated. The results showed that the addition of kaolin particles synergistically enhanced the adsorption capacity of k-TAFe by fixing more Fe(III) ions on the adsorbent. The chelating effect due to Fe(III) played a key role in the adsorption process.
APPLIED CLAY SCIENCE
(2022)
Article
Engineering, Environmental
Ran Yang, Qianqian Chang, Na Li, Hu Yang
Summary: Sulfate radical-based advanced oxidation processes have gained attention in contaminated water treatment. Microscale zero-valent aluminum (mZVAl) is an excellent electron donor and can activate persulfate (PS). However, the natural oxide layer of mZVAl hinders electron transfer. In this study, a composite material consisting of mZVAl and Fe-bearing clay (mZVAl-NaNAu-2) was obtained through ball milling and showed excellent efficiency in degrading various organic contaminants in water.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Boqiang Gao, Yu Pan, Qianqian Chang, Zhonghua Xi, Hu Yang
Summary: In this study, sheet-like BiVO4 with a higher exposure ratio of {0 1 0} facets was synthesized with the addition of TiCl3, and a {01 0}BiVO4/Ag/CdS all-solid-state Z-scheme heterojunction was constructed. The {01 0}BiVO4/Ag/CdS showed enhanced synergistic adsorption and photodegradation performance for FQs in water.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Boqiang Gao, Qianqian Chang, Zhonghua Xi, Mayyada M. H. El-Sayed, Tamer Shoeib, Hu Yang
Summary: In this study, two environmentally-friendly macroscopically formal (PVF) composited sponges (PL and PLS) functionalized with lignin and lignosulfonate, respectively, were fabricated by a one-step mechanical foaming method. PLS showed a high adsorption capacity for removing seven antibiotics from water, attributed to its large specific surface area and the dominant role of electrostatic attraction in near neutral conditions. These composited sponges have the advantages of simple production, environmental-friendliness, convenient recycle, and low cost, making them potentially viable in treating real wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Na Li, Boqiang Gao, Ran Yang, Hu Yang
Summary: The 3D composite aerogels composed of carboxymethyl cellulose and kappa-carrageenan showed excellent adsorption performance for the removal of fluoroquinolones from water. The optimized aerogels had a proper chemically cross-linked interpenetrating network structure, resulting in good mechanical properties and high swelling ratio. Electrostatic attraction was identified as the dominant interaction mechanism in the adsorption process.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Environmental Sciences
Xinyu Hu, Pan Hu, Hu Yang
Summary: In this study, a series of binary graft cationic starch-based coagulants with different hydrophobicities and charge densities were prepared and their coagulation performance was tested in simulated polluted water. It was found that coagulants with higher charge densities and stronger hydrophobicities exhibited better coagulation performance.
Article
Engineering, Environmental
Boqiang Gao, Koukou Tao, Zhonghua Xi, Mayyada M. H. El-Sayed, Tamer Shoeib, Hu Yang
Summary: In this study, a novel 3D lignosulfonate composited PVF sponge impregnated by BiVO4/PANI/Ag ternary photocatalyst was fabricated and showed excellent performance in the adsorption and photodegradation of fluoroquinolones antibiotics. BiVO4/PANI/Ag was well-dispersed and tightly bound to the composited sponge, which efficiently degraded the adsorbed antibiotics through surface photodegradation. The photocatalyst achieved high removal efficiency for all examined antibiotics and maintained a steady performance in continuous dynamic treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Jin JiaSheng, Xia Wei, Hu Pan, Yang Hu
Summary: In this study, a series of composite coagulants (atp-st-CTA) composed of a cationic starch (st-CTA) and attapulgite (ATP) were fabricated to effectively coagulate kaolin and Chlorella suspensions. The coagulation mechanisms of atp-st-CTA were investigated and it was found that the complete charge neutralization due to st-CTA and the enhanced sedimentation by ATP synergistically removed turbidity and algae from the water efficiently. This talented material has great potential in water treatment applications due to its advantages of environmental friendliness, low cost, and high efficiency.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Environmental Sciences
Pan Hu, Kexin Su, Yibei Sun, Pengwei Li, Jun Cai, Hu Yang
Summary: This study systematically investigated the performance and mechanisms of using an etherified starch-based coagulant assisted by polysilicic acid for the coagulation of nano- and micro-sized plastic particles. The enhanced coagulation technique showed high efficiency in removing plastic particles from water and can be used in various water sources.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Shaohang Shen, Hua Wei, Yu Pan, Pan Hu, Hu Yang
Summary: Coagulation/flocculation is an effective method for improving sludge dewaterability. This study used a cationic modified starch-based flocculant (St-CTA) and attapulgite (ATP) to condition waste-activated sludge. The dewatering properties were measured and compared by varying the doses of St-CTA and ATP. The results showed that the combination of St-CTA and ATP could enhance the dewaterability of sludge and reduce the water content in the final sludge cake to below 80%.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Environmental
Na Li, Koukou Tao, Wei Xia, Chunwei Yu, Hu Yang
Summary: A novel organic-inorganic ternary hybrid aerogel, LN/MMT@cellulose, was designed and fabricated for the adsorptive removal of ciprofloxacin in water. LN/MMT@cellulose exhibited good adsorption ability towards ciprofloxacin at low concentrations, even in various water sources. The composite aerogel showed promising potential for the adsorptive removal of antibiotics in water treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jehan Abdel Salam, Amina A. Saleh, Toqa Taha El Nenaiey, Hu Yang, Tamer Shoeib, Mayyada M. H. El-Sayed
Summary: The study investigates the potential use of cape gooseberry husk as a biosorbent for removing pharmaceutical contaminants from water. The activated husk showed increased surface area, pore volume, and adsorption efficiency. It can be regenerated and reused for multiple cycles.
Article
Engineering, Environmental
Wei Xia, Yuyang Wang, Shaohang Shen, Hu Yang
Summary: Harmful algal blooms (HABs) in freshwater lakes and coastal water can be mitigated using a novel actinia-shaped composite coagulant (ATP@CS) comprised of cationic starch (CS) and attapulgite (ATP). The ATP@CS demonstrated superior performance in harvesting Microcystis aeruginosa with a maximum efficiency of over 98.0%. The presence of ATP in the coagulant improved settlement properties and larger, compact, durable, and rapidly regrown flocs were formed. ATP@CS has the potential to be an efficient and environmentally friendly coagulant for HAB removal, with enhanced settlement property, high ecological safety, notable HAB removal efficiency, low cost, and environment friendliness.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Pan Hu, Yibei Sun, Pengwei Li, Wenxiao Ren, Jiachun Ren, Kexin Su, Jun Cai, Mayyada M. H. El-Sayed, Tamer Shoeib, Hu Yang
Summary: In this study, four starch-based coagulants were designed and fabricated, and their efficiency in removing nano-sized plastics from water was evaluated. The results showed that graft and partially hydrophobic starch-based coagulants exhibited better removal efficiency and produced more durable flocs compared to linear and hydrophilic coagulants. The findings highlight the importance of chain architecture and hydrophilicity in the design and selection of polymeric coagulants for efficient water treatment.
SEPARATION AND PURIFICATION 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.
