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膜分离 6

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Preparation and characterization of asymmetric ultrafiltration membrane for effective recovery of proteases

Nora’aini ALI, Fadhilati HASSAN, Sofiah HAMZAH

《化学科学与工程前沿（英文）》 2012年 第6卷 第2期   页码 184-191 doi: 10.1007/s11705-012-1288-z

摘要： The wash water generated from the surimi processing industry contains a large amount of proteases which are widely used in the food and biotechnology industries. Asymmetric polysulfone and polyethersulfone ultrafiltration (PSf-UF and PES-UF) membranes with three different polymer concentrations were screened for their abilities to recover proteases from surimi wash water. In-house fabricated membranes were prepared via a simple dry/wet phase inversion technique and were characterized in terms of permeability coefficient, membrane morphology and molecular weight cut-off (MWCO). The ability of the UF membranes to remove commercial proteases was tested at various pressures (up to 10 bars). The membrane with the best performance, 15 wt-% PSf-UF, was further tested with actual surimi wash water. The effect of the pH of the feed solution (4 to 8) in the pre-treatment stage was also evaluated to recover the highest amount of proteases. The highest retention of protease was 96% with a flux of 25.6 L/(m ·h) which was achieved with the 15 wt-% PSf-UF membrane.

关键词： membrane     ultrafiltration     proteases     surimi wash water    

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On the fouling mechanism of polysulfone ultrafiltration membrane in the treatment of coal gasification

Xue Zou,Jin Li

《化学科学与工程前沿（英文）》 2016年 第10卷 第4期   页码 490-498 doi: 10.1007/s11705-016-1600-4

摘要： Membrane fouling has been investigated by using a polysulfone ultrafiltration membrane with the molecular weight cutoff of 20 kDa to treat crushed coal pressurized gasification wastewater. Under the conditions of different feed pressures, the permeate flux declines and rejection coefficients of pollutants referring to three parameters (total organic carbon (TOC), chroma and turbidity) were studied. The membrane fouling mechanism was simulated with three classical membrane fouling models. The membrane image and pollutants were analyzed by scanning electron microscopy and gas chromatography-mass spectrography (GC-MS). The results indicate that the permeate flux decreases with volume reduction factor before reaching a constant value. The rejection coefficients were also measured: = 70.5%, = 84.9% and = 91%. Further analysis shows that the higher the feed pressure is, the sooner the permeate flux reaches constant value and the more sharply the permeate flux declines. Constant flux indicates a nonlinear growth with feed pressure ( ): when equals 1.2 bar, the mark for the critical flux, slight membrane fouling occurs; when exceeds 1.2 bar, cake layer pollution aggravates. Also the rejection coefficients of global pollutant increases slightly with , suggesting the possibility of cake compression when exceeds 1.2 bar. Through regression analysis, the fouling of polysulfone ultrafiltration membrane could be fitted very well by cake filtration model. The membrane pollutants were identified as phthalate esters and long-chain alkenes by GC-MS, and a certain amount of inorganic pollutants by X-ray photoelectron spectroscopy.

关键词： membrane fouling     ultrafiltration membrane     coal gasification wastewater     rejection coefficient    

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

Boksoon KWON, Noeon PARK, Jaeweon CHO,

《环境科学与工程前沿（英文）》 2010年 第4卷 第2期   页码 172-182 doi: 10.1007/s11783-010-0002-y

摘要： The formation of a dynamic membrane (DM) was investigated using polyethylene glycol (PEG) (molecular weight of 35000 g/mol, concentration of 1 g/L). Two natural organic matters (NOM), Dongbok Lake NOM (DLNOM) and Suwannee River NOM (SRNOM) were used in the ultrafiltration experiments along with PEG. To evaluate the effects of the DM with PEG on ultrafiltration, various transport experiments were conducted, and the analyses of the NOM in the membrane feed and permeate were performed using high performance size exclusion chromatography, and the pore size distribution ( PSD) and molecular weight cut off ( MWCO) were determined. The advantages of DM formed with PEG can be summarized as follows: (1) PEG interferes with NOM transmission through the ultrafiltration membrane pores by increasing the retention coefficient of NOM in UF membranes, and (2) low removal of NOM by the DM is affected by external factors, such as pressure increases during UF membrane filtration, which decreases the PSD and MWCO of UF membranes. However, a disadvantage of the DM with PEG was severe flux decline; thus, one must be mindful of both the positive and negative influences of the DM when optimizing the UF performance of the membrane.

关键词： dynamic membrane     natural organic matters     ultrafiltration membrane performance     effective PSD     effective molecular weight cutoff    

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Electro-assisted CNTs/ceramic flat sheet ultrafiltration membrane for enhanced antifouling and separation

Shuo Wei, Lei Du, Shuo Chen, Hongtao Yu, Xie Quan

《环境科学与工程前沿（英文）》 2021年 第15卷 第1期 doi: 10.1007/s11783-020-1303-4

摘要： Abstract • A stable and electroconductive CNTs/ceramic membrane was fabricated. • The membrane with the electro-assistance exhibited optimal fouling mitigation. • The removal efficiency was improved by the -2.0 V electro-assistance. • Electro-assisted filtration is energy-saving than that of commercial membrane. Ultrafiltration is employed as an important process for water treatment and reuse, which is of great significance to alleviate the shortage of water resources. However, it suffers from severe membrane fouling and the trade-off between selectivity and permeability. In this work, a CNTs/ceramic flat sheet ultrafiltration membrane coupled with electro-assistance was developed for improving the antifouling and separation performance. The CNTs/ceramic flat sheet membrane was fabricated by coating cross-linked CNTs on ceramic membrane, featuring a good electroconductivity of 764.75 S/m. In the filtration of natural water, the permeate flux of the membrane with the cell voltage of -2.0 V was 1.8 times higher than that of the membrane without electro-assistance and 5.7-fold greater than that of the PVDF commercial membrane. Benefiting from the electro-assistance, the removal efficiency of the typical antibiotics was improved by 50%. Furthermore, the electro-assisted membrane filtration process showed 70% reduction in energy consumption compared with the filtration process of the commercial membrane. This work offers a feasible approach for membrane fouling mitigation and effluent quality improvement and suggests that the electro-assisted CNTs/ceramic membrane filtration process has great potential in the application of water treatment.

关键词： Ultrafiltration     Electro-assistance     CNTs     Membrane fouling mitigation    

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Comparison of membrane fouling in ultrafiltration of down-flow and up-flow biological activated carbon

Lu Ao, Wenjun Liu, Yang Qiao, Cuiping Li, Xiaomao Wang

《环境科学与工程前沿（英文）》 2018年 第12卷 第6期 doi: 10.1007/s11783-018-1046-7

摘要：

The UF membrane fouling by down- and up-flow BAC effluents were compared.

Up-flow BAC effluent fouled the membrane faster than down-flow BAC effluent.

The combined effects dominated irreversible fouling.

The extent of fouling exacerbated by inorganic particles was higher.

关键词： Ultrafiltration     Membrane fouling     Down-flow biological activated carbon     Up-flow biological activated carbon     Particles     Polysaccharide    

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weight and vinyl alcohol content on morphology, antifouling, and permeation properties of polysulfone ultrafiltrationmembrane: thermodynamic and formation hydrodynamic behavior

《化学科学与工程前沿（英文）》 2023年 第17卷 第10期   页码 1484-1502 doi: 10.1007/s11705-023-2331-y

摘要： 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.

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

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Co-application of energy uncoupling and ultrafiltration in sludge treatment: Evaluations of sludge reduction, supernatant recovery and membrane fouling control

An Ding, Yingxue Zhao, Zhongsen Yan, Langming Bai, Haiyang Yang, Heng Liang, Guibai Li, Nanqi Ren

《环境科学与工程前沿（英文）》 2020年 第14卷 第4期 doi: 10.1007/s11783-020-1238-9

摘要： Effects of metabolic uncouplers addition on sludge reduction were carried out. TCS addition effectively inhibited ATP synthesis and reduced sludge yield. The effluent quality such as TOC and ammonia deteriorated but not significantly. Suitable dosage retarded biofouling during sludge water recovery by UF membrane. Energy uncoupling is often used for sludge reduction because it is easy to operate and does not require a significant amount of extra equipments (i.e. no additional tank required). However, over time the supernatant extracted using this method can deteriorate, ultimately requiring further treatment. The purpose of this study was to determine the effect of using a low-pressure ultrafiltration membrane process for sludge water recovery after the sludge had undergone an energy uncoupling treatment (using 3,3′,4′,5-tetrachlorosalicylanilide (TCS)). Energy uncoupling was found to break apart sludge floc by reducing extracellular polymeric substances (EPS) and adenosine triphosphate (ATP) content. Analysis of supernatant indicated that when energy uncoupling and membrane filtration were co-applied and the TCS dosage was below 30 mg/L, there was no significant deterioration in organic component removal. However, ammonia and phosphate concentrations were found to increase as the concentration of TCS added increased. Additionally, due to low sludge concentrations and EPS contents, addition of 30–60 mg/L TCS during sludge reduction increased the permeate flux (two times higher than the control) and decreased the hydraulic reversible and cake layer resistances. In contrast, high dosage of TCS aggravated membrane fouling by forming compact fouling layers. In general, this study found that the co-application of energy uncoupling and membrane filtration processes represents an effective alternative method for simultaneous sludge reduction and sludge supernatant recovery.

关键词： Sludge reduction     Energy uncoupling     Ultrafiltration membrane     Membrane fouling    

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Effect of protein on PVDF ultrafiltration membrane fouling behavior under different pH conditions: interface

Xudong WANG,Miao ZHOU,Xiaorong MENG,Lei WANG,Danxi HUANG

《环境科学与工程前沿（英文）》 2016年 第10卷 第4期 doi: 10.1007/s11783-016-0855-9

摘要： pH values of the BSA solution significantly impact the process of membrane fouling. Dramatic flux decline is caused by membrane–BSA adhesion force at start of filtration. XDLVO theory shows the polar or Lewis acid–base interaction plays a major role in membrane fouling. To further determine the fouling behavior of bovine serum albumin (BSA) on different hydrophilic PVDF ultrafiltration (UF) membranes over a range of pH values, self-made atomic force microscopy (AFM) colloidal probes were used to detect the adhesion forces of membrane–BSA and BSA–BSA, respectively. Results showed that the membrane–BSA adhesion interaction was stronger than the BSA–BSA adhesion interaction, and the adhesion force between BSA–BSA-fouled PVDF/PVA membranes was similar to that between BSA–BSA-fouled PVDF/PVP membranes, which indicated that the fouling was mainly caused by the adhesion interaction between membrane and BSA. At the same pH condition, the PVDF/PVA membrane–BSA adhesion force was smaller than that of PVDF/PVP membrane–BSA, which illustrated that the more hydrophilic the membrane was, the better antifouling ability it had. The extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory predicts that the polar or Lewis acid–base (AB) interaction played a dominant role in the interfacial free energy of membrane–BSA and BSA–BSA that can be affected by pH. For the same membrane, the pH values of a BSA solution can have a significant impact on the process of membrane fouling by changing the AB component of free energy.

关键词： PVDF membrane     Membrane fouling     Adhesion force     Protein     Interfacial free energy    

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Preparation and characterization of PVDF-PFSA flat sheet ultrafiltration membranes

Jiquan MA, Junhong ZHAO, Zhongbin REN, Lei LI

《化学科学与工程前沿（英文）》 2012年 第6卷 第3期   页码 301-310 doi: 10.1007/s11705-012-1204-6

摘要： High performance polyvinylidene fluoride (PVDF) flat sheet ultrafiltration (UF) membranes have been prepared by an immersion precipitation phase inversion method using perfluorosulfonic acid (PFSA) as a pore former and as a hydrophilic component of the membranes and polyethylene glycol ( = 400) (PEG400) as a pore forming agent. The effects of the presence of PEG and the concentration of the PFSA on the phase separation of the casting solutions and on the morphologies and performance of UF membranes including their porosity, water flux, rejection of bovine serum albumin (BSA) protein, and anti-fouling property were investigated. Phase diagrams, viscosities and the phase separations upon exposure to water vapor showed that both PEG400 and PFSA promoted demixing of the casting solution. Scanning electron microscopy measurements showed that the PVDF-PFSA blend membranes had more macropores and finger-like structures than the native PVDF membranes. The PVDF-PFSA membrane (5 wt-% PEG400+ 5 wt-% PFSA) had a pure water flux of 141.7 L/m ·h, a BSA rejection of 90.1% and a relative pure water flux reduction (RFR) of 15.28%. These properties were greatly superior to those of the native PVDF membrane (pure water flux of 5.6 L/m ·h, BSA rejection of 96.3% and RFR of 42.86%).

关键词： polyvinylidene fluoride     perfluorosulfonic acid     polyethylene glycol     flat sheet membrane     ultrafiltration    

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Fouling mechanisms in the early stage of an enhanced coagulation-ultrafiltration process

Haiqing CHANG,Baicang LIU,Wanshen LUO,Guibai LI

《环境科学与工程前沿（英文）》 2015年 第9卷 第1期   页码 73-83 doi: 10.1007/s11783-014-0692-7

摘要： We investigated the fouling performances of ultrafiltration (UF) membrane for treating in-line coagulated water in an enhanced coagulation-UF hybrid process. Then we analyzed the fouling mechanisms in the early stage of UF using mathematical models and microscopy observation methods. Finally, we discussed the impact of aeration on membrane fouling in this paper. The results showed that a two-stage of trans-membrane pressure (TMP) profile during the operation of enhanced coagulation-UF membrane was observed, and the relationship between permeability and operation time fitted well with a logarithmic curve. Membrane pores blocking and cake filtration were confirmed as main membrane fouling mechanisms using the mathematical models. The two stages of membrane fouling mechanisms were further deduced, namely, the membrane pore narrowing followed by the formation of cake layer. Membrane autopsy analysis using scanning electron microscopy (SEM) images of the membrane surface sampled from different filtration cycles also confirmed the mechanisms of pores blocking and cake filtration. Moreover, according to the variations of the permeability and membrane fouling resistance, aeration was able to mitigate and control the membrane fouling to a certain extent, but the optimization of aeration conditions still needs to be studied.

关键词： coagulation-UF     trans-membrane pressure (TMP)     permeability     membrane fouling resistance     scanning electron microscopy (SEM)    

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固定化溶菌酶的氧化石墨烯/聚醚砜杂化超滤膜制备及抗菌性能研究

朱军勇,王琼柯,许欣,刘绰绰,刘金盾,张亚涛

《中国工程科学》 2014年 第16卷 第7期   页码 23-29

摘要：

以氧化石墨烯（GO）为固定酶载体，在水溶液中通过静电吸附及氢键作用实现溶菌酶(Ly)的固定化得到GO-Ly。并将已固定化酶的GO为添加剂，以聚醚砜为膜材料，采用相转化法制备杂化超滤膜。考察了添加剂含量对膜形态、亲水性、分离性能、力学性能及抗菌性能的影响。结果表明，GO-Ly 的加入使杂化膜的亲水性及纯水通量得到明显提高，同时拉伸强度也得到一定改善；尤其当GO-Ly 添加量为1.5 %（质量分数）时，膜的纯水通量达到318 L/(m2 · h)，并且对聚乙烯醇（PVA 30 000~70 000）的截留率维持在99 %以上，对大肠杆菌的抑菌率可达68 %。

关键词： 氧化石墨烯     溶菌酶     聚醚砜超滤膜     抗菌性能    

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NIPS法聚偏氟乙烯超滤膜的制备与应用

吕晓龙,武春瑞,张昊,赵丽华

《中国工程科学》 2014年 第16卷 第12期   页码 35-45

摘要：

非溶剂相分离（NIPS）制膜方法是20世纪60年代发明的一种高效的制膜方法。利用该法制备的不对称膜结构赋予膜优异的选择渗透性能，膜孔结构易于调控，已经成为当前聚合物分离膜研究及商业化生产中普遍采用的方法。聚偏氟乙烯（PVDF）具有优异的综合性能，成膜性能佳，可利用NIPS法制膜。NIPS法PVDF膜的研制、膜结构控制方法及应用研究受到国际膜研究者广泛关注，是分离膜领域热点之一。本文分别针对NIPS法PVDF超滤膜制备的相分离原理研究、膜结构控制方法及膜应用研究等关键研究进展作简要介绍。

关键词： 非溶剂致相分离     聚偏氟乙烯     超滤膜     相分离原理     膜结构与性能     膜应用    

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PVDF ultrafiltration membranes of controlled performance via blending PVDF-g-PEGMA copolymer synthesized

Shuai Wang, Tong Li, Chen Chen, Baicang Liu, John C. Crittenden

《环境科学与工程前沿（英文）》 2018年 第12卷 第2期 doi: 10.1007/s11783-017-0980-0

摘要： Polyvinylidene fluoride grafted with poly(ethylene glycol) methyl ether methacrylate (PVDF-g-PEGMA) was synthesized using atomic transfer radical polymerization (ATRP) at different reaction times (9 h, 19 h, and 29 h). The corresponding conversion rates were 10%, 20% and 30%, respectively. PVDF was blended with the copolymer mixture containing PVDF-g-PEGMA, solvent and residual PEGMA under different reaction times. In this study, we explored the effect of the copolymer mixture additives with different synthesis times on cast membrane performance. Increasing the reaction time of PVDF-g-PEGMA causes more PVDF-g-PEGMA and less residual PEGMA to be found in the casting solution. Incremental PVDF-g-PEGMA can dramatically increase the viscosity of the casting solution. An overly high viscosity led to a delayed phase inversion, thus hindering PEGMA segments in PVDF-g-PEGMA from migrating to the membrane surface. However, more residual PEGMA contributed to helping more PEGMA segments migrate to the membrane surface. The pure water fluxes of the blended membrane with reaction times of 9 h, 19 h, and 29 h are 5445 L·m ·h , 1068 L·m ·h and 1179 L·m ·h , respectively, at 0.07 MPa. Delayed phase inversion can form smaller surface pore size distributions, thus decreasing the water flux for the membranes with PVDF-g-PEGMA at 19 h and 29 h. Therefore, we can control the membrane pore size distribution by decreasing the reaction time of PVDF-g-PEGMA to obtain a better flux performance. The membrane with PVDF-g-PEGMA at 19 h exhibits the best foulant rejection and cleaning recovery due to its narrow pore size distribution and high surface oxygen content.

关键词： Polyvinylidene fluoride ultrafiltration membrane     Amphiphilic copolymer     Blended modification     High flux     Atomic transfer radical polymerization    

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Removal of Ni(II) ions from wastewater by micellar enhanced ultrafiltration using mixed surfactants

Amar D. Vibhandik, Kumudini V. Marathe

《化学科学与工程前沿（英文）》 2014年 第8卷 第1期   页码 79-86 doi: 10.1007/s11705-014-1407-0

摘要： Ni(II) ions were removed from aqueous waste using micellar enhanced ultrafiltration (MEUF) with a mixture of surfactants. The surfactant mixture was the nonionic surfactant Tween 80 (TW80) mixed with the anionic surfactant sodium dodecyl sulfate (SDS) in different molar ratios ranging from 0.1–1.5. The operational variables of the MEUF process such as pH, applied pressure, surfactant to metal ion ratio and nonionic to ionic surfactant molar ratio (α) were evaluated. Rejection of Ni and TW80 was 99% and 98% respectively whereas that for SDS was 65%. The flux and all resistances (fouling resistance, resistance due to concentration polarization) were measured and calculated for entire range of α respectively. A calculated flux was found to be declined with time, which was mainly attributed to concentration polarization rather than resistance from membrane fouling.

关键词： MEUF     Ni (II) ions     membrane resistance     concentration polarization     mixed surfactants    

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膜分离技术在缓解水安全问题中的应用

侯立安,张林

《中国工程科学》 2014年 第16卷 第7期   页码 4-9

摘要：

全球气候变化导致的水资源时空分布不均和经济快速发展带来的水污染所引发的水安全问题成为人类社会可持续发展面临的重要挑战。本文针对目前我国水安全的现状和存在的问题，结合国内外膜技术发展趋势，综述了膜技术在饮用水深度处理、废水处理、灾害应急供水及特种废水处理中的应用进展，分析和展望了膜技术应对水安全问题的研究方向。

关键词： 水安全     膜分离     超滤     纳滤     反渗透    

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标题 作者 时间 类型 操作

Preparation and characterization of asymmetric ultrafiltration membrane for effective recovery of proteases

Nora’aini ALI, Fadhilati HASSAN, Sofiah HAMZAH

期刊论文

On the fouling mechanism of polysulfone ultrafiltration membrane in the treatment of coal gasification

Xue Zou,Jin Li

期刊论文

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

Boksoon KWON, Noeon PARK, Jaeweon CHO,

期刊论文

Electro-assisted CNTs/ceramic flat sheet ultrafiltration membrane for enhanced antifouling and separation

Shuo Wei, Lei Du, Shuo Chen, Hongtao Yu, Xie Quan

期刊论文

Comparison of membrane fouling in ultrafiltration of down-flow and up-flow biological activated carbon

Lu Ao, Wenjun Liu, Yang Qiao, Cuiping Li, Xiaomao Wang

期刊论文

weight and vinyl alcohol content on morphology, antifouling, and permeation properties of polysulfone ultrafiltrationmembrane: thermodynamic and formation hydrodynamic behavior

期刊论文

Co-application of energy uncoupling and ultrafiltration in sludge treatment: Evaluations of sludge reduction, supernatant recovery and membrane fouling control

An Ding, Yingxue Zhao, Zhongsen Yan, Langming Bai, Haiyang Yang, Heng Liang, Guibai Li, Nanqi Ren

期刊论文

Effect of protein on PVDF ultrafiltration membrane fouling behavior under different pH conditions: interface

Xudong WANG,Miao ZHOU,Xiaorong MENG,Lei WANG,Danxi HUANG

期刊论文

Preparation and characterization of PVDF-PFSA flat sheet ultrafiltration membranes

Jiquan MA, Junhong ZHAO, Zhongbin REN, Lei LI

期刊论文

Fouling mechanisms in the early stage of an enhanced coagulation-ultrafiltration process

Haiqing CHANG,Baicang LIU,Wanshen LUO,Guibai LI

期刊论文

固定化溶菌酶的氧化石墨烯/聚醚砜杂化超滤膜制备及抗菌性能研究

朱军勇,王琼柯,许欣,刘绰绰,刘金盾,张亚涛

期刊论文

NIPS法聚偏氟乙烯超滤膜的制备与应用

吕晓龙,武春瑞,张昊,赵丽华

期刊论文

PVDF ultrafiltration membranes of controlled performance via blending PVDF-g-PEGMA copolymer synthesized

Shuai Wang, Tong Li, Chen Chen, Baicang Liu, John C. Crittenden

期刊论文

Removal of Ni(II) ions from wastewater by micellar enhanced ultrafiltration using mixed surfactants

Amar D. Vibhandik, Kumudini V. Marathe

期刊论文

膜分离技术在缓解水安全问题中的应用

侯立安,张林

期刊论文