Hollow Fiber Ultrafiltration Membrane for Methyl Green Dye Removal

2020 ◽  
Vol 38 (7A) ◽  
pp. 1077-1083 ◽  
Author(s):  
Saja M. Alardhi ◽  
Jamal M. Alrubaye ◽  
Talib M. Albayati
Keyword(s):  
Dye Removal ◽  
Constant Pressure ◽  
Pure Water ◽  
Membrane System ◽  
Methyl Green ◽  
Permeate Flux ◽  
Separation Processes ◽  
Operation Conditions ◽  
Rejection Coefficient ◽  
Volumetric Flowrate

In this study, the behavior of a Polyvinyl chloride (18 wt % PVC) hollowfiber ultrafiltration (UF) membrane for methyl green (MG) dye removalfrom aqueous solution was estimated by studying the influence of varyingthe operation conditions (the concentration of the dye and volumetric flowrate) to determine their impact on the separation processes (permeate fluxand rejection coefficient) at constant pressure and temperature. The PVCmembrane was characterized by scanning electron microscopy.Furthermore, tests of the UF were carried out with pure water and MGaqueous solutions as feed. Outcomes explained a notable influence of feedconcentration and flow rate on the rejection and permeate flux, with thehighest rejection coefficient value close to 75.2% of the membrane system,at neutral pH.

scholarly journals Behaviour of polysulfone ultrafiltration membrane for dyes removal

2018 ◽  
Vol 77 (8) ◽  
pp. 2093-2100 ◽  
Author(s):  
A. M. Hidalgo ◽  
M. Gómez ◽  
M. D. Murcia ◽  
M. Serrano ◽  
R. Rodríguez-Schmidt ◽  
...  
Keyword(s):  
Congo Red ◽  
Textile Industry ◽  
Rejection Rate ◽  
Ultrafiltration Membrane ◽  
Methyl Green ◽  
Permeate Flux ◽  
Separation Processes ◽  
Ph Values ◽  
Rejection Coefficient ◽  
Limited Application

Abstract Although ultrafiltration membranes have been used for the separation of macromolecules and colloids from solutions, this process has a limited application in the removal of dyes present in coloured discharges of textile industry, as these typically have much lower molecular weight than the molecular cut-off of the membranes (MWCO). In the present work, we have evaluated the behaviour of a polysulfone ultrafiltration membrane in the removal of different dyes from aqueous solutions (Congo red, methyl green and amaranth). Different variables (tangential flow rate, concentration of dye and pH of the feed) were studied to determine their influence on the separation processes (permeate flux and rejection coefficient). The results show that Congo red is easily removed with a GR60PP membrane (MWCO = 25 kDa), whereas methyl green and amaranth show rejection coefficient values of approximately 25.78% and 13.85%, respectively, at neutral pH. Also, an interesting effect is observed for the rejection coefficient for methyl green at different pH values. In addition, several treatments were performed to the membrane so as to modify its surface, trying to improve the values obtained for permeate flux and rejection rate.

Preparation and Characterization of PVDF-TiO2 Composite Membranes Blended with Different Mw of PVP for Oily Wastewater Treatment using Submerged Membrane System

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
C. S. Ong ◽  
W. J. Lau ◽  
P. S. Goh ◽  
A. F. Ismail Ismail
Keyword(s):  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Membrane System ◽  
Morphological Properties ◽  
Oily Wastewater ◽  
Permeate Flux ◽  
Oily Wastewater Treatment

Polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration (UF) membranes consisted of TiO2 and different molecular weight (Mw) of polyvinylpyrrolidone (PVP) (i.e. 10, 24, 40 and 360 kDa) were prepared to treat synthesized oily wastewater. The membrane performances were characterized in terms of pure water flux, permeate flux and oil rejection while the membrane morphological properties were studied using SEM and AFM. PVDF-TiO2 composite membrane prepared from PVP40k was found as the optimum membrane due to its high flux and high rejection during filtration process, recording      45 L/m2.h and 80% respectively, when tested using 250 ppm oily solution under submerged condition. The experimental results demonstrated that with increasing Mw of PVP, PVDF-TiO2 membrane had higher protein rejection, smaller porosity and smoother surface layer. With increasing oil concentration from 250 to 1000 ppm, the permeate flux of the PVDF-PVP40k was obviously decreased while the oil rejection was gradually increased due to the additional selective layer formed on the membrane surface.  Based on the findings, the PVDF-TiO2 membrane with PVP40k can be considered as a potential membrane for oily wastewater industry due to the high permeate flux and oil rejection. 

scholarly journals Treatment of Synthetic Produced Water using Hybrid Membrane Processes

2018 ◽  
Vol 22 (2) ◽  
Author(s):  
N. Chin ◽  
S. O. Lai ◽  
K. C. Chong ◽  
S. S. Lee ◽  
C. H. Koo ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Produced Water ◽  
Removal Rate ◽  
Pure Water ◽  
Water Flux ◽  
Transmembrane Pressure ◽  
Oil Removal ◽  
Permeate Flux ◽  
Uf Membranes ◽  
Pes Membrane

The study was concerned with the treatment of tank dewatering produced water using hybrid microfiltration (MF) and ultrafiltration (UF) processes. The pre-treatment MF membrane was fabricated with polyethersulfone (PES), n-methyl-2-pyrrolidone (NMP) and polyvinylpyrrolidone (PVP). The UF membranes meanwhile contained additional component, i.e., titanium dioxide (TiO2) nanoparticles in the range of zero to 1.0 wt.%. The membrane performances were analysed with respect to permeate flux, oil removal and flux recovery ratio. An increase in TiO2 nanoparticles enhanced the pore formation, porosity and pure water permeability due to improved hydrophilicity. The permeate flux of UF membranes increased with the increase of TiO2 nanoparticles and pressure. The oil removal rate by MF process was only 52.35%, whereas the oil rejection efficiency was between 82.34% and 95.71% for UF process. It should be highlighted that the overall oil removal rate could achieve as high as 97.96%. Based on the results, the PES membrane incorporated with 1.0 wt.% TiO2 was proved to be the most promising membrane at a transmembrane pressure of 3 bar. Although 1.0 M NaOH solution could be used as cleaning agent to recover membrane water flux, it is not capable of achieving good results as only 52.18% recovery rate was obtained.

scholarly journals Fabrication and Performance Evaluation of Integrated Solar-Driven Membrane Distillation System with Serpentine-shape of Flat Plate Solar Collector for Seawater Desalination

2019 ◽  
Vol 23 (3) ◽  
Author(s):  
M. A. H. M. Hanoin ◽  
N. S. Mohammed ◽  
M. A. I. Z. Arris ◽  
A. I. A. Bakar ◽  
N. M. Mokhtar ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Flat Plate ◽  
Solar Collector ◽  
Pure Water ◽  
Feed Solution ◽  
Membrane Distillation ◽  
The Self ◽  
Permeate Flux ◽  
Salt Rejection ◽  
Flat Plate Solar Collector

Solar-powered membrane distillation (SPMD) system has gained its popularity in desalination application for past decade credit to the system efficiency in producing pure water and the utilization of renewable energy. However, most of the past SPMD works used commercial solar thermal collector (STC) as the thermal energy supply to the feed solution and the study only focused on the performance of the system in terms of flux and salt rejection. In this work, a self-made flat plate solar collector (FPSC) with the serpentine-shape pipe was designed and fabricated to study the effect of the STC towards the membrane performance. Before testing, a simulation work of the fluid flow inside the serpentine-shape pipe of the FPSC was analyzed using NX 10.0 computer-aided design simulation. After that, the efficiency of the self-made FPSC system was tested directly to sunlight in order to identify the maximum irradiance and the temperature of the feed solution. Due to the fluctuation of solar irradiance, the experimental setup of the SPMD system was tested using a solar simulator, and the performance was compared with the membrane distillation (MD) system without integration with FPSC system. Based on the simulation data, it can be concluded that the heat losses across the pipe are due to the slower fluid velocity and sudden pressure drop, which attributed to centripetal force and pressure differences. Meanwhile, the outdoor evaluation data showed that the temperatures of collector and water inside the feed tank could reach up to 84°C and 64°C, respectively when the maximum irradiance of 938 W/m2 was applied. For the performance evaluation between with and without the self-made FPSC system, it can be seen that only marginal difference can be observed for the permeate flux and salt rejection with an average difference of 6.06% and 1.29%, respectively.

scholarly journals Hybrid System Coupling Moving Bed Bioreactor with UV/O3 Oxidation and Membrane Separation Units for Treatment of Industrial Laundry Wastewater

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2648
Author(s):  
Sylwia Mozia ◽  
Magdalena Janus ◽  
Sławomira Bering ◽  
Krzysztof Tarnowski ◽  
Jacek Mazur ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Membrane Separation ◽  
Oxygen Demand ◽  
Membrane System ◽  
Permeate Flux ◽  
Moving Bed ◽  
System A ◽  
Water Recycle ◽  
Recycle And Reuse ◽  
System Coupling

This paper describes the investigations on the possibilities of treatment of wastewater generated in an industrial laundry with application of a combined biological-photooxidation- membrane system aimed at water recycle and reuse. The two treatment schemes were compared: 1) scheme A consisting of a treatment in a moving bed biological reactor (MBBR) followed by microfiltration (MF) and nanofiltration (NF), and 2) scheme B comprising MBBR followed by oxidation by photolysis enhanced with in situ generated O3 (UV/O3) after which MF and NF were applied. The removal efficiency in MBBR reached 95–97% for the biochemical oxygen demand; 90–93% for the chemical oxygen demand and 89–99% for an anionic and a nonionic surfactants. The application of UV/O3 system allowed to decrease the content of the total organic carbon by 68% after 36 h of operation with a mineralization rate of 0.36 mg/L·h. Due to UV/O3 pretreatment, a significant mitigation of membrane fouling in the case of both MF and NF processes was achieved. The MF permeate flux in the system B was over two times higher compared to that in the system A. Based on the obtained results it was concluded that the laundry wastewater pretreated in the MBBR-UV/O3-MF-NF system could be recycled to any stage of the laundry process.

scholarly journals ON/OFF Switchable Nanocomposite Membranes for Separations

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2415
Author(s):  
Taegyun Kwon ◽  
Jinyoung Chun
Keyword(s):  
Membrane Separation ◽  
Polymer Nanocomposite ◽  
Membrane System ◽  
Polymeric Membranes ◽  
Human Consumption ◽  
Stimuli Responsive ◽  
Permeate Flux ◽  
Future Direction ◽  
The Cost ◽  
External Stimuli

Although water, air, and other resources are abundant on earth, they have been subjected to strict environmental regulations. This is because of their limitation of availability for human consumption. In the separation industry, the membrane system was introduced to increase the amount of resources available to mankind. Experts used an easy-to-use polymeric material to design several membranes with porous structures for wastewater treatment, gas separation, and chemical removal; consequently, they succeeded in obtaining positive results. However, past polymeric membranes exhibited a chronic drawback such that it was difficult to simultaneously augment the permeate flux and improve its selectivity toward certain substances. Because of the trade-off relationship that existed between permeability and selectivity, the membrane efficiency was not very good; consequently, the cost-effectiveness was significantly hindered because there was no other alternative than to replace the membrane in order to maintain its initial characteristics steadily. This review begins with the introduction of a polymer nanocomposite (PNC) membrane that has been designed to solve the chronic problem of polymeric membranes; subsequently, the stimuli-responsive PNC membrane is elucidated, which has established itself as a popular topic among researchers in the separation industry for several decades. Furthermore, we have listed the different types and examples of stimuli-responsive PNC membranes, which can be switched by external stimuli, while discussing the future direction of the membrane separation industry.

A review on membrane applications and transport mechanisms in vacuum membrane distillation

2017 ◽  
Vol 34 (1) ◽  
Author(s):  
Rakesh Baghel ◽  
Sushant Upadhyaya ◽  
Kailash Singh ◽  
Satyendra P. Chaurasia ◽  
Akhilendra B. Gupta ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Membrane Separation ◽  
Critical Evaluation ◽  
Experimental Studies ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Separation Processes ◽  
Vacuum Membrane Distillation ◽  
Polarization Coefficient ◽  
The Impact

AbstractThe main aim of this article is to provide a state-of-the-art review of the experimental studies on vacuum membrane distillation (VMD) process. An introduction to the history of VMD is carried out along with the other membrane distillation configurations. Recent developments in process, characterization of membrane, module design, transport phenomena, and effect of operating parameters on permeate flux are discussed for VMD in detail. Several heat and mass transfer correlations obtained by various researchers for different VMD modules have been discussed. The impact of membrane fouling with its control in VMD is discussed in detail. In this paper, temperature polarization coefficient and concentration polarization coefficient are elaborated in detail. Integration of VMD with other membrane separation processes/industrial processes have been explained to improve the performance of the system and make it more energy efficient. A critical evaluation of the VMD literature is incorporated throughout this review.

scholarly journals Improved Surface Functional and Photocatalytic Properties of Hybrid ZnO-MoS2-Deposited Membrane for Photocatalysis-Assisted Dye Filtration

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 106 ◽  
Author(s):  
Saranya Rameshkumar ◽  
Rory Henderson ◽  
Ramesh Babu Padamati
Keyword(s):  
Membrane Filtration ◽  
Dye Removal ◽  
Dye Degradation ◽  
Irradiation Time ◽  
Complete Removal ◽  
Membrane Resistance ◽  
Bandgap Energy ◽  
Permeate Flux ◽  
Synergistic Mechanism ◽  
Surfactant Assisted

The synergistic mechanism of photocatalytic-assisted dye degradation has been demonstrated using a hybrid ZnO-MoS2-deposited photocatalytic membrane (PCM). Few layers of MoS2 sheets were produced using the facile and efficient surfactant-assisted liquid-phase exfoliation method. In this process, hydrophilic moieties of an anionic surfactant were adsorbed on the surface of MoS2, which aided exfoliation and promoted a stable dispersion due to the higher negative zeta potential of the exfoliated MoS2 sheets. Further, the decoration of ZnO on the exfoliated MoS2 sheets offered a bandgap energy reduction to about 2.77 eV, thus achieving an 87.12% degradation of methylene blue (MB) dye within 15 min of near UV-A irradiation (365 nm), as compared with pristine ZnO achieving only 56.89%. The photocatalysis-enhanced membrane filtration studies on the ZnO-MoS2 PCM showed a complete removal of MB dye (~99.95%). The UV-assisted dye degradation on the ZnO-MoS2 PCM offered a reduced membrane resistance, with the permeate flux gradually improving with the increase in the UV-irradiation time. The regeneration of the active ZnO-MoS2 layer also proved to be quite efficient with no compromise in the dye removal efficiency.

Anomalous Decrease in Flow Rates of Micro-Orifice Flows of Water With Increasing the Elapsed Time After Inception of the Flow

2011 ◽  
Author(s):  
Tomiichi Hasegawa ◽  
Akiomi Ushida ◽  
Hiroshige Uchiyama ◽  
Takatsne Narumi
Keyword(s):  
Flow Rate ◽  
Constant Pressure ◽  
Pure Water ◽  
Pressure Differential ◽  
Flow Rates ◽  
Elapsed Time ◽  
Incipient Stage ◽  
City Water

Flow rates under some pressure differentials were measured for the flow of water through micro-orifices. It was found that the flow rate decreases as the time has elapsed after inception of the flow under a constant pressure differential and that the decrease in flow rates is larger for city water than for pure water, and the gold orifice provides a less decrease with time in flow rates than the nickel orifice, although the flow rate at the incipient stage of the experimental run is lower in the gold orifice than in the nickel orifice.

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