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The effect of extracellular polymeric substances (EPS) of iron-oxidizing bacteria (Ochrobactrum EEELCW01) on mineral transformation and arsenic (As) fate

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Journal of Environmental Sciences 2023年第8期130卷 187-196页

作者： Chuan Wu Yueru Chen Ziyan Qian Hongren Chen Waichin Li Qihou Li Shengguo Xue School of Metallurgy and Environment Central South UniversityChangsha 410083China Department of Science and Environmental Studies The Education University of Hong KongHong Kong 999077China Ministry of Scientific Research Central South UniversityChangsha 410083China

extracellular polymeric substances(EPS)are an importantmedium for communication and material exchange between iron-oxidizing bacteria and the external environment and could induce the iron(oxyhydr)oxides production which reduced arsenic(As)*** main component of EPS secreted by iron-oxidizing bacteria(Ochrobactrum EEELCW01)was composed of polysaccharides(150.76-165.33 mg/g DW)followed by considerably smaller amounts of proteins(12.98–16.12 mg/g DW).Low concentrations of As(100 or 500μmol/L)promoted the amount of EPS *** results showed that EPS was composed of polysaccharides,proteins,and a miniscule amount of nucleic *** functional groups including-COOH,-OH,-NH,-C=O,and-C-O played an important role in the adsorption of *** results showed that As was bound to EPS in the form of As3+.With increasing As concentration,the proportion of As3+adsorbed on EPS *** with a weak crystalline state was only produced in the system at 6 hr during the mineralization process of Ochrobactrum *** day 8,the minerals were composed of goethite,galena,and *** the increasing mineralization time,the main mineral phases were transformed from weakly crystalline hydrous iron ore into higher crystallinity siderite(FeCO_(3))or goethite(α-FeOOH),and the specific surface area and active sites of minerals were *** can be seen from the distribution of As elements that As is preferentially adsorbed on the edges of iron *** study is potential to understand the biomineralizationmechanism of iron-oxidizing bacteria and As remediation in the environment.

关键词： Iron-oxidizing bacteria extracellular polymeric substances (EPS) Arsenic(As) Biomineralization Mineral phases transformation

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Role of extracellular polymeric substances in resistance to allelochemical stress on Microcystis aeruginsosa and its mechanism

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Journal of Oceanology and Limnology 2023年第6期41卷 2219-2231页

作者： Li YIN Ying XU Desheng KONG Juan WANG Kaipian SHI Yong ZHANG Huan HE Shaogui YANG Lixiao NI Shiyin LI School of Environment Nanjing Normal UniversityNanjing 210023China Department of Geological Sciences University of AlabamaTuscaloosaAL 35487USA Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education/School of Environment Hohai UniversityNanjing 210098China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Using allelochemicals to suppress cyanobacteria growth is a prospective method for its high efficiency and ecological ***,the suppression efficiency is affected inevitably by the extracellular polymeric substances(EPS)produced by cyanobacteria,and the knowledge about the roles of EPS in resistance to allelochemical stress is *** the study,two typical anti-cyanobacterial allelochemicals were adopted to investigate the role of EPS in resistance to allelochemical stress on Microcystis *** show that EPS was crucial in alleviating the toxicity of allelochemicals to algae,especially in stabilizing the metabolism and photosynthetic activity of algal *** aggregation rate of algal cells increased with the increase of EPS secretion,which alleviated the stress of *** proteins and humic acids in EPS provided a binding site for allelochemicals,and the EPS-allelochemicals complex were formed by chemical *** study improved our comprehension of the role of EPS in algal inhibition by allelochemicals.

关键词： allelochemicals extracellular polymeric substances cyanobacteria Microcystis aeruginosa allelopathy

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Effect of extracellular polymeric substances on Dolichospermum aggregation during temperature rise

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Journal of Oceanology and Limnology 2023年第6期41卷 2208-2218页

作者： Dailan DENG Han MENG You MA Yongqi GUO Zixuan WANG Huan HE Khan WAQAS Jin’e LIU Limin ZHANG School of Environment Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and ApplicationNanjing Normal UniversityNanjing 210023China Green Economy Development Institute Nanjing University of Finance and EconomicsNanjing 210023China Jiangsu Engineering Lab of Water and Soil Eco-remediation Nanjing 210023China

Dolichospermum,a typical model filamentous of cyanobacteria,has the potential to cause severely *** polymeric substances(EPSs)are considered to influence the aggregation of the algae,and temperature is a significant factor affecting EPSs ***,the mechanism of how EPSs affects the aggregation of Dolichospermum is still unclear because the structure and composition of EPSs are *** this study,the effects of EPSs on the aggregation of Dolichospermum during the rise of temperature(7-37℃)were *** results showed that the concentration of extracellular polysaccharides and proteins changed significantly with increasing temperature(Psubstances and protein were main components of S-EPS and LB-EPS,and protein was the main component of tightly bound EPS(TB-EPS).Secondly,the cell density of Dolichospermum increased during the temperature rise while the aggregation ratio ***,zeta potential and surface thermodynamic analysis of Dolichospermum revealed that the interfacial free energy and electrostatic repulsion increased gradually with increasing temperature,which further reduced the aggregation of ***,principal component analysis(PCA)analysis showed the aggregation of Dolichospermum was directly related to the changes of protein in EPSs(especially S-EPS and LB-EPS)and zeta potential,and polysaccharides in EPSs inhibited the aggregation of *** on these results,it was illustrated that the composition and concentration of EPSs affected the cell surface properties of Dolichospermum with the change of temperature and thus affected the aggregation of D

关键词： temperature Dolichospermum extracellular polymeric substances aggregation

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extracellular polymeric substances-antibiotics interaction in activated sludge:A review

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Environmental Science and Ecotechnology 2023年第1期13卷 23-36页

作者： Weixin Zhao Jia You Shilei Yin Haizhou Yang Shufei He Likui Feng Jianju Li Qingliang Zhao Liangliang Wei State Key Laboratory of UrbanWater Resources and Environment(SKLUWRE) School of EnvironmentHarbin Institute of TechnologyHarbin150090China

Antibiotics,the most frequently prescribed drugs,have been widely applied to prevent or cure human and veterinary diseases and have undoubtedly led to massive releases into sewer networks and wastewater treatment systems,a hotspot where the occurrence and transformation of antibiotic resistance take *** polymeric substances(EPS),biopolymers secreted via microbial activity,play an important role in cell adhesion,nutrient retention,and toxicity ***,the potential roles of sludge EPS related to the resistance and removal of antibiotics are still *** work summarizes the composition and physicochemical characteristics of state-of-the-art microbial EPS,highlights the critical role of EPS in antibiotics removal,evaluates their defense performances under different antibiotics exposures,and analyzes the typical factors that could affect the sorption and biotransformation behavior of ***,interactions between microbial EPS and antibiotic resistance genes are *** perspectives,especially the engineering application of microbial EPS for antibiotics toxicity detection and defense,are also emphatically stressed.

关键词： extracellular polymeric substances Antibiotics Antibiotic resistance genes Sorption Biotransformation Resistance

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A Synergistic Acceleration of Corrosion of Q235 Carbon Steel Between Magnetization and extracellular polymeric substances

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Acta Metallurgica Sinica(English Letters) 2018年第5期31卷 456-464页

作者： Hong-Wei Liu Da-Ke Xu Bi-Juan Zheng Muhammad Asif Fu-Ping Xiong Guo-An Zhang Hong-Fang Liu Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Institute of Metal Research Chinese Academy of Sciences

In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field（MF） on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-reducing bacteria（SRB） or extracellular polymeric substances（EPS）. Results demonstrated that a 150 mT MF enhanced steel corrosion in a SRB-containing NaCl solution by 202% calculated from weight loss with pitting corrosion as the main corrosion *** EPS or MF rendered steel corrosion, but a synergistic interaction between MF and EPS boosted up steel *** synergistic enhancement could be referred to the alteration in orientation of EPS induced by MF. The presence of higher percentage of chloride ions on the carbon steel surface manifested that MF initiated the erosion of chloride ions on the carbon steel coupon.

关键词： Sulphate-reducing bacteria Magnetic field extracellular polymeric substances Microbiologically influenced corrosion

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Influence of extracellular polymeric substances from activated sludge on the aggregation kinetics of silver and silver sulfide nanoparticles

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Frontiers of Environmental Science & Engineering 2022年第2期16卷 13-24页

作者： Wanpeng Chen Jiahui Song Shaojie Jiang Qiang He Jun Ma Xiaoliu Huangfu Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education) College of Environment and EcologyChongqing UniversityChongqing 400044China Sichuan Education Press Chengdu 610200China State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental EngineeringHarbin Institute of TechnologyHarbin 150090China

extracellular polymeric substances(EPS)in activated sludge from wastewater treatment plants(WWTPs)could affect interactions between nanoparticles and alter their migration *** influence mechanisms of silver nanoparticles(Ag NPs)and silver sulfide nanoparticles(Ag_(2)S NPs)aggregated by active EPS sludge were studied in monovalent or divalent cation *** aggregation behaviors of the NPs without EPS followed the Derjaguin-Landau-Verwey-Overbeek(DLVO)*** counterions aggravated the aggregation of both NPs,and the divalent cation had a strong neutralizing effect due to the decrease in electrostatic repulsive *** extended DLVO(EDLVO)model analysis,in NaNO3 and low-concentration Ca(NO_(3))_(2)(<10 mmol/L)solutions,EPS could alleviate the aggregation behaviors of Cit-Ag NPs and Ag_(2)S NPs due to the enhancement of steric repulsive *** high concentrations of Ca(NO_(3))_(2)(10‒100 mmol/L),exopolysaccharide macromolecules could promote the aggregation of Cit-Ag NPs and Ag_(2)S NPs by interparticle *** the final transformation form of Ag NPs in water environments,Ag_(2)S NPs had better stability,possibly due to their small van der Waals forces and their strong steric repulsive *** is essential to elucidate the surface mechanisms between EPS and NPs to understand the different fates of metal-based and metal-sulfide NPs in WWTP systems.

关键词： Silver nanoparticles Silver sulfide nanoparticles extracellular polymeric substances Aggregation kinetics Influence mechanisms

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Effects of solution conditions on the physicochemical properties of stratification components of extracellular polymeric substances in anaerobic digested sludge

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Journal of Environmental Sciences 2013年第1期25卷 155-162页

作者： Dongqin Yuan Yili Wang College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry University

The composition and effects of solution conditions on the physicochemical properties of the stratification components of extracellular polymeric substances （EPS） in anaerobic digested sludge were determined. The total EPS in anaerobic digested sludge were extracted by the cation exchange resin method. Another EPS extraction method, the ceutrifugation and sonication technique was employed to stratify the EPS into three fractions： slime, loosely bound （LB）-EPS, and tightly bound （TB）-EPS from the outside to the inside of the anaerobic digested sludge. Proteins and polysaccharides were dispersed uniformly across the different EPS fractions, and humic-like substances were mainly partitioned in the slime, with TB-EPS second. Protein was the major constituent of the LB-EPS and TB-EPS, and the corresponding ratios ranged from 54.0% to 65.6%. The hydrophobic part in the EPS chemical components was primarily comprised of protein and DNA, while the hydrophilic part was mainly composed of polysaccharide. In the slime, the hydrophobic values of several EPS chemical components （protein, polysaccharide, humic-like substances and DNA） were all below 50%. The protein/polysaccharide ratio had a significant influence on the Zeta potentials and isoelectric point values of the EPS： the greater the protein/polysaccharide ratio of the EPS was, the greater the Zeta potential and the higher the isoelectric point value were. All Zeta potentials of the EPS showed a decreasing trend with increasing pH. The corresponding isoelectric point values （pH） were 2.8 for total EPS, 2.2 for slime, 2.7 for LB-EPS, and 2.6 for TB-EPS. As the ionic strength increased, the Zeta potentials sharply increased and then gradually became constant without charge reversal. In addition, as the temperature increased （〈 40℃）, the apparent viscosity of the EPS decreased monotonically and then gradually became stable between 40 and 60℃.

关键词： anaerobic digested sludge extracellular polymeric substances stratification components physicochemical properties solution conditions

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Flocculating characteristic of activated sludge flocs:Interaction between Al^(3+) and extracellular polymeric substances

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Journal of Environmental Sciences 2013年第5期25卷 916-924页

作者： Xiaodong Ruan Lin Li Junxin Liu Research Center for Eco-Environmental Science Chinese Academy of Sciences

Aluminum flocculant can enhance the flocculating performance of activated ***,the binding mechanism of aluminum ion（Al 3＋） and extracellular polymeric substances（EPS） in activated sludge is unclear due to the complexity of *** this work,threedimensional excitation emission matrix fluorescence spectroscopy（3DEEM）,fluorescence quenching titration and Fourier transform infrared spectroscopy（FT-IR） were used to explore the binding behavior and mechanism between Al 3＋ and *** results showed that two fluorescence peaks of tyrosineand tryptophan-like substances were identified in the loosely bound-extracellular polymeric substances（LB-EPS）,and three peaks of tyrosine-,tryptophanand humic-like substances were identified in the tightly boundextracellular polymeric substances（TB-EPS）.It was found that these fluorescence peaks could be quenched with Al 3＋ at the dosage of 3.0 mg/L,which demonstrated that strong interactions took place between the EPS and Al 3＋.The conditional stability constants for Al 3＋ and EPS were determined by the Stern-Volmer *** to the binding mechanism,the-OH,N-H,C=O,C-N groups and the sulfurand phosphorus-containing groups showed complexation action,although the groups in the LB-EPS and TB-EPS showed different *** TB-EPS have stronger binding ability to Al 3＋ than the LB-EPS,and TB-EPS play an important role in the interaction with Al 3＋.

关键词： extracellular polymeric substances activated sludge aluminum ion three-dimensional excitation emission matrix fluorescence quenching Fourier transform infrared spectroscopy

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Effects of ultrasonic pretreatment on sludge dewaterability and extracellular polymeric substances distribution in mesophilic anaerobic digestion

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Journal of Environmental Sciences 2010年第3期22卷 474-480页

作者： Liming Shao Guanzhao Wang Huacheng Xu Guanghui Yu Pinjing He State Key Laboratory of Pollution Control and Resources Reuse Shanghai 200092 China. Key Laboratory of Yangtze River Water Environment Shanghai 200092 China College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Effect of ultrasonic pretreatment on sludge dewaterability was determined and the fate of extracellular polymeric substances （EPS） matrix in mesophilic anaerobic digestion after ultrasonic pretreatment was studied. Characteristics of proteins （PN）, polysaccharides （PS）, excitation-emission matrix （EEM） fluorescence spectroscopy and molecular weight （MW） distribution of dissolved organic matters （DOM） in different EPS fractions were evaluated. The results showed that after ultrasonic pretreatment, the normalized capillary suction time （CST） decreased from 44.4 to 11.1 （sec·L）/g total suspended solids （TSS） during anaerobic digestion, indicating that sludge dewaterability was greatly improved. The normalized CST was significantly correlated with PN concentration （R2 = 0.92, p 〈 0.01） and the PN/PS ratio （R2 = 0.84, p 〈 0.01） in the loosely bound EPS （LB-EPS） fraction. Meanwhile, the average MW of DOM in the LB- EPS and tightly bound EPS （TB-EPS） fractions also had a good correlation with the normalized CST （R2 〉 0.66, p 〈 0.01）. According to EEM fluorescence spectroscopy, tryptophan-like substances intensities in the slime, LB-EPS and TB-EPS fractions were correlated with the normalized CST. The organic matters in the EPS matrix played an important role in influencing sludge dewaterability.

关键词： anaerobic digestion excitation-emission matrix extracellular polymeric substances sludge dewaterability

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In situ role of extracellular polymeric substances in microbial electron transfer by Methylomonas ***13

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Fundamental Research 2021年第6期1卷 735-741页

作者： Huan Wang Yue Zheng Baoli Zhu Feng Zhao CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of Sciences1799 Jimei RoadXiamen 361021China Key Laboratory of Agro-ecological Processes in Subtropical Regions Taoyuan Agroecosystem Research StationInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China

extracellular polymeric substances(EPS),produced by microorganisms,establish the functional and structural integrity of microbial *** biological wastewater treatments,the transformation of pollutants largely relies on microbial electron *** a bridge between the microbial cytomembrane/cytoderm and terminal electron acceptors,the role of EPS in microbial electron transfer cannot be ***,due to the complexity of its composition,the in situ function of EPS in extracellular electron transfer is still *** this work,we constructed an epsH gene knockout mutant of Methylomonas ***13 with significantly reduced EPS *** content of protein and polysaccharide,two major components of EPS,of theΔepsH mutant and wild-type during different growth stages were *** redox signal and in situ Au reduction of theΔepsH mutant were obviously stronger than those of the wild-type,which suggested that EPS can hinder extracellular electron transfer in this *** redox activity was detected in EPS,high faradaic resistance of EPS was *** results enlighten the in situ role of EPS in extracellular electron transfer with the help of molecular manipulations and provide insights into how to regulate the microbial process of wastewater treatments.

关键词： extracellular electron transfer extracellular polymeric substances Gene knockout Au reduction Methanotrophs

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