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学者姓名：王湛
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摘要 ：
Extracellular polymeric substances (EPSs) in activated sludge suspensions are the key substances leading to the membrane fouling. In order to understand the effect of EPSs on the membrane fouling, the actual EPSs solution extracted from activated sludge suspensions was used as the feed solution to conduct dead-end microfiltration experiment under different pressures by using different membranes. The flux (J), fouling resistances (Rm, Rp, Rc and Rtotal) and the available membrane area (A/A0) were used to describe the membrane fouling. The results showed that with the increase of pressure, J and Rtotal increased. Rp firstly increased and then kept constant, Rc always increased and became the dominant resistance. A/A0 decreased from 1 to a constant. Rc plays a key role on Rtotal for different membranes under the same pressure. The sequence of the steady available membrane area (Asteady/A0) for different pressures was: 63.0% (0.05MPa)> 56.5% (0.08MPa)> 53.6% (0.10MPa), and that for different membranes was: 80.1% (0.2μm PES) > 79.9% (0.1μm PES) > 78.4% (0.1μm PAN) > 53.6% (0.1μm PVDF). © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Membranes Membranes Polymers Polymers Microfiltration Microfiltration Energy resources Energy resources Membrane fouling Membrane fouling
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| GB/T 7714 | Li, Qiang , Hu, Ge , Song, Peng et al. Membrane fouling of actual extracellular polymeric substances [C] . 2021 . |
| MLA | Li, Qiang et al. "Membrane fouling of actual extracellular polymeric substances" . (2021) . |
| APA | Li, Qiang , Hu, Ge , Song, Peng , Khaliunaa, Natsagdorj , Khurram, Rooha , Zhang, Hu et al. Membrane fouling of actual extracellular polymeric substances . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This study systematically investigated the fouling behavior and mechanism of PAN Microfiltration (MF) membrane fouled with the model binary mixture (bovine serum albumin (BSA) and sodium alginate (SA)) of extracellular polymer substance (EPS) solution under different concentration and transmembrane pressure (TMP). The result showed that the fouling mechanism of the model binary mixture was the pore blocking and cake formation. Moreover, the SA plays a dominant role in the model binary mixture (BSA/SA). The higher SA concentration could cause the more serious membrane fouling (both the flux (J) and the available membrane area (A/A0) decreased), and the total resistance increased and caused the fouling mechanism changing from combined complete blocking and cake filtration into individual cake filtration appeared earlier. In addition, increasing of the TMP can also aggravate membrane fouling and it could be accurately described by the cake-complete model. This studied offered insight into the model binary mixture in the fouling behavior and mechanism, which can be used as guidance for practical application. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Binary mixtures Binary mixtures Energy resources Energy resources Mammals Mammals Sodium alginate Sodium alginate Membrane fouling Membrane fouling Microfiltration Microfiltration
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| GB/T 7714 | Gao, Shujuan , Liu, Xinsen , Zhang, Hu et al. The study of fouling behavior for the model binary mixture [C] . 2021 . |
| MLA | Gao, Shujuan et al. "The study of fouling behavior for the model binary mixture" . (2021) . |
| APA | Gao, Shujuan , Liu, Xinsen , Zhang, Hu , Liu, Xuguo , Wang, Zhan , Wang, Xi . The study of fouling behavior for the model binary mixture . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In order to sufficiently study the effects of stirring speed and temperature on the membrane flux, the flux recovery rate (FRR) and model parameters (k1, k2, k3 and Ri) of the PAN membrane (200kDa) fouled by yeast suspension, a series of rinsing experiments were carried out. Meanwhile, the instantaneous membrane flux was predicted by the rinsing model and corresponding regression equation of model parameters was obtained. The result indicated that the model shows a good agreement (R2>0.9700) and the temperature has a more significant effect on FRR and model parameters (k1, k2, k3 and Ri). FRR increased from 58.40% to 99.41% when the temperature increase from 25°C to 55°C (the rate constant of dissolution increased from 0.00371 m-1 to 0.00531 m-1) while it only increased from 55.67% to 67.50% when the stirring speed increases from 200 rpm to 800 rpm (the rate constant of dissolution increased from 0.00366 m-1 to 0.00456 m-1). In addition, the rinsing condition can be optimized by the combination of the prediction model of flux (equation (1)) and the regression equation (equation (2)) to obtain the optimal cleaning condition. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Rate constants Rate constants Dissolution Dissolution Energy resources Energy resources Yeast Yeast Predictive analytics Predictive analytics
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| GB/T 7714 | Guo, Yangyang , Qiao, Zhaoyu , Wang, Zhan et al. Rinsing condition optimization of the membrane fouled by yeast suspension [C] . 2021 . |
| MLA | Guo, Yangyang et al. "Rinsing condition optimization of the membrane fouled by yeast suspension" . (2021) . |
| APA | Guo, Yangyang , Qiao, Zhaoyu , Wang, Zhan , Luo, Huijia , Wang, Xi . Rinsing condition optimization of the membrane fouled by yeast suspension . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this study, error function was used to analyze the membrane fouling behavior (flux decay) for bovine serum album (BSA) solution in dead-end mode and for kaolin suspension in cross-flow mode under constant pressure. The results showed that the predictions of error function had good agreements with experimental data both in dead-end mode and cross-flow mode. Meanwhile, both higher concentration and higher TMP could accelerate the membrane fouling rate. In addition, the parameter k in error function decreased with the increase of concentration or TMP. Thus, smaller parameter k represented more serious membrane fouling. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Energy resources Energy resources Errors Errors Mammals Mammals Membrane fouling Membrane fouling Microfiltration Microfiltration Suspensions (fluids) Suspensions (fluids)
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| GB/T 7714 | Hu, Ge , Zhong, Chenyin , Wang, Zhan et al. Application of error function in dead-end/cross-flow microfiltration mode [C] . 2021 . |
| MLA | Hu, Ge et al. "Application of error function in dead-end/cross-flow microfiltration mode" . (2021) . |
| APA | Hu, Ge , Zhong, Chenyin , Wang, Zhan , Wang, Xi . Application of error function in dead-end/cross-flow microfiltration mode . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Homogeneous electrocatalytic reaction has been extensively applied in electrochemical flow sensors especially for the detection of non-electroactive species. Herein, homogeneous electrocatalytic reaction is studied on a rotating disc electrode (RDE) system to mimic the forced convection in flow sensors in both experiments and theory. The experimental RDE voltammogram reveals a pre plateau feature under the rotation frequency of 25 rpm and the corresponding theoretical current–potential curves generated by 2D axisymmetric electrochemical analysis model is in good consistency with the experimental voltammetric responses. Based on the same model, mediator and substrate concentration distributions and the diffusion layer thicknesses are discussed in detail. Moreover, the interference of direct electrochemical oxidation of the substrate is investigated via the homogeneous electrocatalytic reaction between 1,1′-ferrocenedicarboxylic acid and L-cysteine and the corresponding second-order rate constant (372 (mol m−3)−1 s−1) is shown by the modified model. Also, the influence of substrate diffusion coefficients in homogeneous electrocatalytic reaction is analyzed and the obtained transition point indicates the specific critical second-order rate constant for both ferroceneacetic acid (106.02 (mol m−3)−1 s−1) and 1,1′-ferrocenedicarboxylic acid (105.36 (mol m−3)−1 s−1) as the mediator. At last, the design principle of homogeneous electrocatalytic flow sensor is summarized. © 2021 The Author(s)
关键词 ：
Amino acids Amino acids Electrocatalysis Electrocatalysis Electrochemical electrodes Electrochemical electrodes Electrochemical oxidation Electrochemical oxidation Mass transfer Mass transfer Rate constants Rate constants Rotating disks Rotating disks
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| GB/T 7714 | Song, Peng , Yin, Shuang , Wang, Zhan . Insights into the design of homogeneous electrocatalytic flow sensor via a rotating disc electrode system [J]. | Materials and Design , 2021 , 206 . |
| MLA | Song, Peng et al. "Insights into the design of homogeneous electrocatalytic flow sensor via a rotating disc electrode system" . | Materials and Design 206 (2021) . |
| APA | Song, Peng , Yin, Shuang , Wang, Zhan . Insights into the design of homogeneous electrocatalytic flow sensor via a rotating disc electrode system . | Materials and Design , 2021 , 206 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In order to objectively elucidate the state of the membrane after long-term operation, the performance of a full-scale microfiltration-reverse osmosis (MF-RO) integrated membrane system with production capacity of 20,000 m3/d for wastewater reclamation was evaluated by collecting 10 years performance data. The foulants on 1 MF membrane and 12 RO membranes along the feed channel also were analyzed by membrane autopsy. The results indicate that the water quality of the system can still meet the customer requirements while the mechanical and desalting properties of the membranes were close to the abandoned standards. In terms of foulants distribution, the MF membrane surface was covered by a thick cake layer and the leading RO membrane suffered the highest fouling load. The predominate organic foulants on the membrane surface were protein and polysaccharide, and the main inorganic foulants were Fe and Ca, and their distribution showed two different trends along the feed channel. Regarding bio-foulants, the compositions of bacterial colonies on 12 RO membranes were basically the same, but the relative abundance of the dominant bacteria was different and the microbial diversity increased gradually from the leading element to the terminal one in both the two stages. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Microfiltration Microfiltration Reverse osmosis Reverse osmosis Water quality Water quality Water filtration Water filtration Desalination Desalination Membranes Membranes Energy resources Energy resources Wastewater reclamation Wastewater reclamation
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| GB/T 7714 | Luo, Huijia , Cui, Yong , Wang, Zhan et al. Performance and foulants characterization of the industrial integrated membrane system [C] . 2021 . |
| MLA | Luo, Huijia et al. "Performance and foulants characterization of the industrial integrated membrane system" . (2021) . |
| APA | Luo, Huijia , Cui, Yong , Wang, Zhan , Guo, Yangyang , Wang, Xi . Performance and foulants characterization of the industrial integrated membrane system . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Cross-flow filtration mode can greatly alleviate the membrane fouling due to the presence of shear stress. In this paper, a new flux prediction model for steady cross-flow microfiltration has been established by considering the effect of shear stress as function of the geometry of filtration module and the suspension properties in the particle mass balance. The results showed that this model possessed higher accuracy in both laminar and turbulent flow regime (relative error sigma = 4.43%/1.91%) than Glen Bolton's model (sigma = 11.88%/6.42%) and Makardij's model (sigma = 9.44%/12.92%). Meanwhile, the validity of the proposed model was approved by using other suspensions (yeast suspension and activated sludge suspension) (sigma < 3.43%) and other membranes (PVDF and PES microfiltration membrane) (sigma < 4.63%). Moreover, new criterion relationships between Sherwood number (Sh), Reynolds number (Re) and Schmidt number (Sc) in both laminar and turbulent flow regime were also established.
关键词 ：
Criterion relations Criterion relations Cross-flow microfiltration Cross-flow microfiltration Laminar/turbulent flow regime Laminar/turbulent flow regime Membrane fouling Membrane fouling Shear stress Shear stress
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| GB/T 7714 | Wang, Zhan , Gao, Zhenfu . A new flux prediction model for laminar and turbulent flow regimes in constant pressure cross-flow microfiltration [J]. | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2021 , 9 (5) . |
| MLA | Wang, Zhan et al. "A new flux prediction model for laminar and turbulent flow regimes in constant pressure cross-flow microfiltration" . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 9 . 5 (2021) . |
| APA | Wang, Zhan , Gao, Zhenfu . A new flux prediction model for laminar and turbulent flow regimes in constant pressure cross-flow microfiltration . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2021 , 9 (5) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
A new model based on the removal mechanism of loose/compact cake and the re-deposition mechanism of foulants was proposed to predict the instantaneous fouling resistance (Rf(t)) in the rinsing process of 0.1 mu m PAN membrane fouled with activated sludge. The variation trend of Rf(t) was also analyzed by the removal rate of loose/compact cake (rr-ose/rr-compact) and the re-deposition rate of foulants (rre-deposition). Moreover, the model was validated by using other foulants (yeast, actual activated sludge, HA and SA) and membranes (0.1 mu m PES and PVDF membranes). The results showed that the model predictions had good agreements with experimental data at different cross-flow velocities (1.0, 1.5, 2.0 and 2.5 m/s) or temperatures (25, 30, 35 and 40 degrees C) (R2 0.9900). Besides, the variation trend of Rf(t) could be divided into three stages: (i) Rf(t) quickly decreased and the removal of loose cake was almost completed at rinsing time of t1 (first transition point) (rrose = 0); (ii) Rf(t) slowly decreased and Rf(t) reached to minimum (rr-compact = rre-deposition) at t2 (second transition point); (iii) Rf(t) slightly increased after t2 (rr-compact(t)<rre-deposition(t)). This model would provide an accurate method to analyze the variation trend of Rf(t) in the rinsing process and a theoretical basis for the optimization of rinsing conditions.
关键词 ：
compact cake compact cake Desorption energy Desorption energy Mechanism Mechanism ose ose Rinsing model Rinsing model Transition point Transition point
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| GB/T 7714 | Qiao, Zhaoyu , Wang, Zhan , Guo, Yangyang . A new model based on the cake removal and the re-deposition mechanism in the rinsing process [J]. | JOURNAL OF MEMBRANE SCIENCE , 2021 , 636 . |
| MLA | Qiao, Zhaoyu et al. "A new model based on the cake removal and the re-deposition mechanism in the rinsing process" . | JOURNAL OF MEMBRANE SCIENCE 636 (2021) . |
| APA | Qiao, Zhaoyu , Wang, Zhan , Guo, Yangyang . A new model based on the cake removal and the re-deposition mechanism in the rinsing process . | JOURNAL OF MEMBRANE SCIENCE , 2021 , 636 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Studying the effect of different operation conditions (bovine serum albumin (BSA) concentration, flux and stirring speed) on the membrane fouling behaviors (the variation of transmembrane pressure (TMP), cake resistance (Rc), pore blocking resistance (Ri) and available membrane area ratio (A/A0)) is of paramount importance in the membrane bioreactor (MBR) process. The constant flux filtration experiment was conducted to investigate the fouling behaviors of BSA solution, which provides a guidance for controlling the membrane fouling. The intermediate blocking-cake combined model was established and it was described mathematically with good results. The results showed that the influence sequence of operating conditions on the TMP was obtained as flux > concentration > stirring speed. Meanwhile, Rc decreased with the increase of stirring speed, and the A/A0 decreased with the increase of BSA concentration and the flux. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
关键词 ：
Bioreactors Bioreactors Energy resources Energy resources Mammals Mammals Membrane fouling Membrane fouling Membranes Membranes Microfiltration Microfiltration
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| GB/T 7714 | Yin, Shuang , Song, Peng , Chen, Yujie et al. An investigation of the membrane fouling behaviors in constant flux mode [C] . 2021 . |
| MLA | Yin, Shuang et al. "An investigation of the membrane fouling behaviors in constant flux mode" . (2021) . |
| APA | Yin, Shuang , Song, Peng , Chen, Yujie , Du, Xinpei , Liu, Xuguo , Zhang, Hu et al. An investigation of the membrane fouling behaviors in constant flux mode . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Electroactive species modified electrodes are extensively studied as the mediator donor in homogeneous electrocatalytic reaction for electrochemical sensing purpose. In this paper, homogeneous electrocatalytic reaction within a thin layer modified electrode is investigated theoretically and experimentally to illustrate the electroactive species distribution on ferrocenedicarboxylic acid modified carbon black paste electrodes (FDACBPE). The voltammetric analysis of the fabricated FDACBPE reveals that the electrode is in diffusional control at the scan rate lower than 50 mV s-1 while a surface control electrode reaction is observed at a higher scan rate. Based on the experimental results, three finite element models including thin layer model, fixed mediator model and combined model are established to evaluate the homogeneous electrocatalytic reaction with FDACBPE. The numerical results show that the anodic peak gap order of 3 models is as follows: fixed mediator model > combined model > thin layer model. As validation of the proposed model, the comparison between experimental results and numerical data on both polished and unpolished FDACBPE indicates that the combined model data are more suitable for the description of experimental voltammograms compared with the other two models. Also, the comparison between these models suggests that both surface confined and diffusional FDA exist when FDACBPE is employed.
关键词 ：
Electroactive layer Electroactive layer Electrocatalytic reaction Electrocatalytic reaction Ferrocenedicarboxylic acid Ferrocenedicarboxylic acid Numerical simulation Numerical simulation Surface modified electrode Surface modified electrode
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| GB/T 7714 | Song, Peng , Li, Yan , Yin, Shuang et al. Simulation-based evaluation of homogeneous electrocatalytic reaction within a thin layer modified electrode [J]. | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2021 , 901 . |
| MLA | Song, Peng et al. "Simulation-based evaluation of homogeneous electrocatalytic reaction within a thin layer modified electrode" . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY 901 (2021) . |
| APA | Song, Peng , Li, Yan , Yin, Shuang , Tang, Yang , Wang, Zhan . Simulation-based evaluation of homogeneous electrocatalytic reaction within a thin layer modified electrode . | JOURNAL OF ELECTROANALYTICAL CHEMISTRY , 2021 , 901 . |
| 导入链接 | NoteExpress RIS BibTex |
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