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Characterization of the dissolved organic matter in sewage effluent of sequence batch reactor: the impact of carbon source

Jin GUO, Feng SHENG, Jianhua GUO, Xiong YANG, Mintao MA, Yongzhen PENG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 280-287 doi: 10.1007/s11783-011-0336-0

Abstract: During the biologic degradation process, the low molecular weight (MW) fraction (<1 kDa) gradually decreased

Keywords： effluent organic matter (EfOM)     extracellular polymeric substance (EPS)     molecular weight distribution(MWD)     hydrophobic     hydrophilic     excitation emission matrices (EEM)    

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Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region

Xiaoliang LI, Xiaomin CHEN, Xia LIU, Lianchuan ZHOU, Xinqiang YANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 195-203 doi: 10.1007/s11783-012-0391-1

Abstract: Soil low-molecular-weight (LMW) organic acids play important roles in the soil-forming process and the

Keywords： Karst rocky desertification     low-molecular-weight (LMW) organic acids     distribution characteristics     soil    

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Uncovering the effect of poly(ethylene-co-vinyl alcohol) molecular weight and vinyl alcohol content on

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1484-1502 doi: 10.1007/s11705-023-2331-y

Abstract: Various hydrophilic poly(ethylene-co-vinyl alcohol) (EVOH) were used herein to precisely control the structure and hydrodynamic properties of polysulfone (PSF) membranes. Particularly, to prepare pristine PSF and PSF/EVOH blends with increasing vinyl alcohol (VOH: 73%, 68%, 56%), the non-solvent-induced phase separation (NIPS) technique was used. Polyethylene glycol was used as a compatibilizer and as a porogen in N,N-dimethylacetamide. Rheological and ultrasonic separation kinetic measurements were also carried out to develop an ultrafiltration membrane mechanism. The extracted membrane properties and filtration capabilities were systematically compared to the proposed mechanism. Accordingly, the addition of EVOH led to an increase in the rheology of the dopes. The resulting membranes exhibited a microporous structure, while the finger-like structures became more evident with increasing VOH content. The PSF/EVOH behavior was changed from immediate to delayed segregation due to a change in the hydrodynamic kinetics. Interestingly, the PSF/EVOH32 membranes showed high hydrophilicity and achieved a pure water permeability of 264 L·m–2·h–1·bar–1, which was higher than that of pure PSF membranes (171 L·m–2·h–1·bar–1). In addition, PSF/EVOH32 rejected bovine serum albumin at a high rate (> 90%) and achieved a significant restoration of permeability. Finally, from the thermodynamic and hydrodynamic results, valuable insights into the selection of hydrophilic copolymers were provided to tailor the membrane structure while improving both the permeability and antifouling performance.

Keywords： polysulfone     blend modification     ultrafiltration membrane     formation hydrodynamics     poly(ethylene-co-vinyl alcohol) copolymer    

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Effects of molecular weight and concentration of carboxymethyl cellulose on morphology of hydroxyapatite

Ruiqiang LIU,Rattan LAL

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5,   Pages 804-812 doi: 10.1007/s11783-015-0785-y

Abstract: In this paper, two types of CMC, with respective molecular weights (MW) of ~120000 and ~240000 Dalton

Keywords： nanotechnology     nanoparticles     apatite     carboxymethyl cellulose (CMC)     particle size    

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Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization

Guangyin ZHEN, Xueqin LU, Baoying WANG, Youcai ZHAO, Xiaoli CHAI, Dongjie NIU, Tiantao ZHAO

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 2,   Pages 267-276 doi: 10.1007/s11783-013-0530-3

Abstract: In this work, the enhanced dewaterabing characteristics of waste activated sludge using Fenton pretreatment was investigated in terms of effectiveness and statistical optimization. Response surface method (RSM) and central composite design (CCD) were applied to evaluate and optimize the effectiveness of important operational parameters, i.e., H O concentrations, Fe concentrations and initial pH values. A significant quadratic polynomial model was obtained ( 0.9189) with capillary suction time (CST) reduction efficiency as the response. Numerical optimization based on desirability function was carried out. The optimum values for H O , Fe , and initial pH were found to be 178 mg·g VSS (volatile suspended solids), 211 mg·g VSS and 3.8, respectively, at which CST reduction efficiency of 98.25% could be achieved. This complied well with those predicted by the established polynomial model. The results indicate that Fenton pretreatment is an effective technique for advanced waste activated sludge dewatering. The enhancement of sludge dewaterability by Fenton’s reagent lies in the migration of sludge bound water due to the disintegration of sludge flocs and microbial cells lysis.

Keywords： Fenton pretreatment     response surface methodology (RSM)     capillary suction time (CST)     dewaterabilty     molecularweight distribution    

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Tetra-detector size exclusion chromatography characterization of molecular and solution properties of

Qingbin Guo,Sheng Chang

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 2, doi: 10.1007/s11783-017-0922-x

Abstract: Tetra-detector HPSEC was evaluated for the SMP characterization Molecular weight and intrinsic viscosityApproach to analyze the concentration polarization of the SMP was discussed Characterization of the molecularIn this study, the distributions of the absolute molecular weight and intrinsic viscosity of SMP polysaccharidescalibration relationship for the SMP polysaccharides was developed and the molecular conformations,average molecular weights, and hydrodynamic sizes of the SMP polysaccharides were also explored.

Keywords： Soluble microbial product     Extracellular polymeric substance     Membrane bioreactor     Membrane fouling     Molecularweight     Intrinsic viscosity    

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vanbaalenii PYR-1 endowed with an enhanced activity of dihydroxylation of high-molecular-weight

Yiquan Wu, Ying Xu, Ningyi Zhou

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 1, doi: 10.1007/s11783-019-1193-5

Abstract: . • Both NidA3B3 and FNidA3B3 catalyze high-molecular-weight PAHs dihydroxylation. • NidA3B3 shows anNidA3B3 is a terminal dioxygenase whose favorable substrates are high-molecular-weight polyaromatic hydrocarbons

Keywords： Biodegradation     polyaromatic hydrocarbons     biotransformation     ring-hydroxylating dioxygenase system    

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Oil bleed from elastomeric thermal silicone conductive pads

Yuqi Chen,Yakai Feng,Jingqi Zhao,Jingbo Shen,Menghuang Feng

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 4,   Pages 509-516 doi: 10.1007/s11705-016-1586-y

Abstract: Cured resins with a high crosslinking density and a high molecular weight of vinyl silicone residues

Keywords： oil bleed     crosslinking density     molecular weight     vinyl silicones     hydrosilicones    

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Factors controlling

Chengkun WANG, Xiaojian ZHANG, Chao CHEN, Jun WANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 2,   Pages 151-157 doi: 10.1007/s11783-013-0482-7

Abstract: Tianjin was fractionated with different XAD resins and a series of ultra-filtration membranes with molecularweight (MW) cut-offs of 5k Da, 3k Da, and 1k Da, respectively.

Keywords： italic>-nitrosodimethylamine (NDMA)     disinfection by-product     dissolved organic nitrogen (DOC)     hydrophilic     molecularweight (MW)     specific ultraviolet absorbance at 254 nm (SUVA254)    

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The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes

Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang

Frontiers of Medicine 2020, Volume 14, Issue 1,   Pages 1-7 doi: 10.1007/s11684-019-0733-5

Abstract: With the improvements of sanitation and nationwide safe water supply the occurrence of bacterial diarrhea declined remarkably, while viruses became the leading causes of acute gastroenteritis (AGE). Of these viruses, noroviruses (NoVs) are responsible for a considerable burden of gastroenteritis, especially in children<2 years and elderly≥65 years. NoVs circulating in the Chinese population are antigenically highly diverse with the genotype GII.4 being the dominant strain followed by GII.3. Given the widespread contamination in environmental sources, and highly infectious nature of NoVs, vaccination would be the desirable strategy for the control of NoV infections. However, a better understanding of acquired immunity after infection, and a reliable immunological surrogate marker are urgently needed, since two vaccine candidates based on virus-like particles (VLPs) are currently moving into clinical evaluations in China.

Keywords： molecular epidemiology     norovirus     disease burden     genotype     China    

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Effects of a dynamic membrane formed with polyethylene glycol on the ultrafiltration of natural organic matter

Boksoon KWON, Noeon PARK, Jaeweon CHO,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 2,   Pages 172-182 doi: 10.1007/s11783-010-0002-y

Abstract: The formation of a dynamic membrane (DM) was investigated using polyethylene glycol (PEG) (molecularweight of 35000 g/mol, concentration of 1 g/L).and permeate were performed using high performance size exclusion chromatography, and the pore size distribution( PSD) and molecular weight cut off ( MWCO) were determined.

Keywords： dynamic membrane     natural organic matters     ultrafiltration membrane performance     effective PSD     effective molecularweight cutoff    

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Molecular analysis of bacterial community in the tap water with different water ages of a drinking waterdistribution system

Feng Wang, Weiying Li, Yue Li, Junpeng Zhang, Jiping Chen, Wei Zhang, Xuan Wu

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 3, doi: 10.1007/s11783-018-1020-4

Abstract: Bacterial community in the drinking water distribution system (DWDS) was regulated by multiple environmental

Keywords： Bacterial community     Water age     High-throughput sequencing technique     Drinking water distribution system    

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Studies on culture condition of new marine bacterium sp. SY01

LAN Wenjian, MO Linfeng, LI Houjin, CAI Chuanghua, ZHOU Yipin, YAO Junhua

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4,   Pages 443-446 doi: 10.1007/s11705-008-0065-5

Abstract: In particular, a series of high-molecular-weight compounds with high relative abundances were observed

Keywords： producer     high-molecular-weight     relative     culture     different culture    

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Solving topology optimization problems by the Guide-Weight method

Xinjun LIU, Zhidong LI, Liping WANG, Jinsong WANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 1,   Pages 136-150 doi: 10.1007/s11465-010-0126-6

Abstract: Guide-Weight method, proposed first by Chen in 1980s, was effectively and successfully used in antennaWhen the Guide-Weight method is applied into topology optimization, it works very well with unified andThe algorithm of the Guide-Weight method and the improvement on it are described; two formulations oftopology optimization solved by the Guide-Weight method combining with SIMP method are presented; subsequently, three numerical examples are provided, and comparison of the Guide-Weight method with other methods

Keywords： Guide-Weight method     topology optimization     SIMP method    

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Instantaneous deflection of light-weight concrete slabs

Behnam VAKHSHOURI, Shami NEJADI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 4,   Pages 412-423 doi: 10.1007/s11709-017-0416-8

Abstract: An experimental investigation is performed on four simply supported Light-Weight Concrete (LWC) one-way

Keywords： instantaneous deflection     light-weight concrete     expanded polystyrene     effective moment of inertia     cracking    

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Title Author Date Type Operation

Characterization of the dissolved organic matter in sewage effluent of sequence batch reactor: the impact of carbon source

Jin GUO, Feng SHENG, Jianhua GUO, Xiong YANG, Mintao MA, Yongzhen PENG

Journal Article

Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region

Xiaoliang LI, Xiaomin CHEN, Xia LIU, Lianchuan ZHOU, Xinqiang YANG

Journal Article

Uncovering the effect of poly(ethylene-co-vinyl alcohol) molecular weight and vinyl alcohol content on

Journal Article

Effects of molecular weight and concentration of carboxymethyl cellulose on morphology of hydroxyapatite

Ruiqiang LIU,Rattan LAL

Journal Article

Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization

Guangyin ZHEN, Xueqin LU, Baoying WANG, Youcai ZHAO, Xiaoli CHAI, Dongjie NIU, Tiantao ZHAO

Journal Article

Tetra-detector size exclusion chromatography characterization of molecular and solution properties of

Qingbin Guo,Sheng Chang

Journal Article

vanbaalenii PYR-1 endowed with an enhanced activity of dihydroxylation of high-molecular-weight

Yiquan Wu, Ying Xu, Ningyi Zhou

Journal Article

Oil bleed from elastomeric thermal silicone conductive pads

Yuqi Chen,Yakai Feng,Jingqi Zhao,Jingbo Shen,Menghuang Feng

Journal Article

Factors controlling

Chengkun WANG, Xiaojian ZHANG, Chao CHEN, Jun WANG

Journal Article

The epidemiology of norovirus gastroenteritis in China: disease burden and distribution of genotypes

Honglu Zhou, Songmei Wang, Lorenz von Seidlein, Xuanyi Wang

Journal Article

Effects of a dynamic membrane formed with polyethylene glycol on the ultrafiltration of natural organic matter

Boksoon KWON, Noeon PARK, Jaeweon CHO,

Journal Article

Molecular analysis of bacterial community in the tap water with different water ages of a drinking waterdistribution system

Feng Wang, Weiying Li, Yue Li, Junpeng Zhang, Jiping Chen, Wei Zhang, Xuan Wu

Journal Article

Studies on culture condition of new marine bacterium sp. SY01

LAN Wenjian, MO Linfeng, LI Houjin, CAI Chuanghua, ZHOU Yipin, YAO Junhua

Journal Article

Solving topology optimization problems by the Guide-Weight method

Xinjun LIU, Zhidong LI, Liping WANG, Jinsong WANG

Journal Article

Instantaneous deflection of light-weight concrete slabs

Behnam VAKHSHOURI, Shami NEJADI

Journal Article