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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 ：
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 ：
Desalination Desalination Energy resources Energy resources Membranes Membranes Microfiltration Microfiltration Reverse osmosis Reverse osmosis Wastewater reclamation Wastewater reclamation Water filtration Water filtration Water quality Water quality
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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 ：
How to precisely describe the fouling behavior of activated sludge suspension in constant flux cross-flow filtration is a challenge. In this paper, a three-mechanism (standard pore blocking, complete pore blocking and cake filtration) model was established based on the classic blocking law to describe the fouling behavior of activated sludge suspension in the constant flux cross-flow filtration. The results showed that the predictions of the proposed model showed good agreements with experimental data not only for activated sludge suspension (R-2 >= 0.994), but also for bovine serum albumin protein (BSA) (R-2 >= 0.966), humic acid (HA) (R-2 >= 0.940), sodium alginate (SA) (R-2 >= 0.801) and kaolin (R-2 >= 0.961). Meanwhile, for activated sludge suspension, the variation rate of the cake resistance increased with the filtration flux, and the steady available membrane area ratio (A(steady)/A(0)) was independent on the filtration flux while it decreased with the increase of MLSS concentration. In addition, the available membrane area ratio (A(t)/A(0)) decreased slower for activated sludge suspension than that for single model solution (BSA, HA and SA) in the fouling process.
关键词 ：
Activated sludge suspension Activated sludge suspension Constant flux Constant flux Cross-flow Cross-flow Extracellular polymeric substance Extracellular polymeric substance Model Model
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| GB/T 7714 | Hu, Ge , Liu, Xinsen , Wang, Zhan et al. Comparison of fouling behaviors between activated sludge suspension in MBR and EPS model solutions: A new combined model [J]. | JOURNAL OF MEMBRANE SCIENCE , 2021 , 621 . |
| MLA | Hu, Ge et al. "Comparison of fouling behaviors between activated sludge suspension in MBR and EPS model solutions: A new combined model" . | JOURNAL OF MEMBRANE SCIENCE 621 (2021) . |
| APA | Hu, Ge , Liu, Xinsen , Wang, Zhan , Du, Xinpei , Wang, Xi . Comparison of fouling behaviors between activated sludge suspension in MBR and EPS model solutions: A new combined model . | JOURNAL OF MEMBRANE SCIENCE , 2021 , 621 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Photocatalysis and membrane technology in a single unit is an ideal strategy for the development of wastewater treatment systems. In this work, novel GO (x wt%)/TiO2-CA hybrid membranes have been synthesized via a facile non-solvent induced phase inversion technique. The strategy aimed to address the following dilemmas: (1) Effective utilization of visible light and minimize e(-)/h(+) recombination; (2) Enhanced separation capability and superior anti-fouling and self-cleaning ability. The experimental results reveal that the integration of nano-composite (GO/TiO2) boosts the membrane properties when compared to pristine CA and single photocatalyst employed membrane (GO-CA and TiO2-CA). The effect of GO content on the properties of the photocatalytic membrane has been determined by utilizing three different ratios of GO, viz. 0.5 wt%, 1 wt%, and 2 wt% designated as NC(1)-CA, NC(2)-CA, and NC(3)-CA, respectively. Amongst them, NC(3)-CA membrane showed state-of-the-art performance with an elevated photocatalytic response (four times higher than pristine CA membrane) toward methyl orange. Moreover, the water flux of NC(3)-CA membrane is 613 L/m(2)h, approximately three times higher than bare CA membrane (297 L/m(2)h), while keeping the MO rejection high (96.6%). Besides, fouling experiments presented the lowest total and fouling resistance ratios and a higher flux recovery ratio (91.78%) for the NC(3)-CA membrane, which endows the membrane with higher anti-fouling and self-cleaning properties. Thus, NC(3)-CA membrane outperforms the other as synthesized membranes in terms of separation efficiency, visible light photo-degradation of pollutant, anti-fouling and self-cleaning ability. Therefore, NC(3)-CA membrane is considered as the next generation membrane for exhibiting great potential for the wastewater treatment applications.
关键词 ：
clean technology and engineering clean technology and engineering environmental science environmental science Graphene oxide (GO) Graphene oxide (GO) Photocatalytic membranes Photocatalytic membranes photo-degradation of MO photo-degradation of MO self-cleaning and anti-fouling ability self-cleaning and anti-fouling ability Titania (TiO2) Titania (TiO2)
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| GB/T 7714 | Khurram, Rooha , Javed, Aroosa , Ke, Ruihua et al. Visible Light-Driven GO/TiO2-CA Nano-Photocatalytic Membranes: Assessment of Photocatalytic Response, Antifouling Character and Self-Cleaning Ability [J]. | NANOMATERIALS , 2021 , 11 (8) . |
| MLA | Khurram, Rooha et al. "Visible Light-Driven GO/TiO2-CA Nano-Photocatalytic Membranes: Assessment of Photocatalytic Response, Antifouling Character and Self-Cleaning Ability" . | NANOMATERIALS 11 . 8 (2021) . |
| APA | Khurram, Rooha , Javed, Aroosa , Ke, Ruihua , Lena, Cheng , Wang, Zhan . Visible Light-Driven GO/TiO2-CA Nano-Photocatalytic Membranes: Assessment of Photocatalytic Response, Antifouling Character and Self-Cleaning Ability . | NANOMATERIALS , 2021 , 11 (8) . |
| 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 |
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