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.

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 Luffa cylindrica Immobilized with Aspergillus terreus QMS-1: an Efficient and Cost-Effective Strategy for the Removal of Congo Red using Stirred Tank Reactor

2020 ◽  
Vol 69 (2) ◽  
pp. 193-203
Author(s):  
QANDEEL LARAIB ◽  
MARYAM SHAFIQUE ◽  
NUSRAT JABEEN ◽  
SEHAR AFSHAN NAZ ◽  
HAFIZ RUB NAWAZ ◽  
...  
Keyword(s):  
Congo Red ◽  
Textile Industry ◽  
Aspergillus Terreus ◽  
Quantitative Estimation ◽  
Oxygen Demand ◽  
Cost Effective ◽  
Stirred Tank ◽  
Luffa Cylindrica ◽  
Stirred Tank Bioreactor ◽  
Efficient System

Microbial populations within the rhizosphere have been considered as prosperous repositories with respect to bioremediation aptitude. Among various environmental contaminants, effluent from textile industries holds a huge amount of noxious colored materials having high chemical oxygen demand concentrations causing ecological disturbances. The study was aimed to explore the promising mycobiome of rhizospheric soil for the degradation of azo dyes to develop an efficient system for the exclusion of toxic recalcitrants. An effluent sample from the textile industry and soil samples from the rhizospheric region of Musa acuminata and Azadirachta indica were screened for indigenous fungi to decolorize Congo red, a carcinogenic diazo dye, particularly known for its health hazards to the community. To develop a bio-treatment process, Aspergillus terreus QMS-1 was immobilized on pieces of Luffa cylindrica and exploited in stirred tank bioreactor under aerobic and optimized environment. Quantitative estimation of Congo red decolorization was carried out using UV-Visible spectrophotometer. The effects of fungal immobilization and biosorption on the native structure of Luffa cylindrica were evaluated using a scanning electron microscope. A. terreus QMS-1 can remove (92%) of the dye at 100 ppm within 24 h in the presence of 1% glucose and 1% ammonium sulphate at pH 5.0. The operation of the bioreactor in a continuous flow for 12 h with 100 ppm of Congo red dye in simulated textile effluent resulted in 97% decolorization. The stirred tank bioreactor was found to be a dynamic, well maintained, no sludge producing approach for the treatment of textile effluents by A. terreus QMS-1 of the significant potential for decolorization of Congo red.

Visible absorption spectroscopy study of the adsorption of Congo Red by montmorillonite

Clay Minerals ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. 483-500 ◽  
Author(s):  
Z. Yermiyahu ◽  
I . Lapides ◽  
S. Yariv
Keyword(s):  
Congo Red ◽  
Surface Acidity ◽  
Electronic Spectroscopy ◽  
Visible Absorption ◽  
Ph Values ◽  
Aqueous Suspensions ◽  
Metallic Cation ◽  
Dark Violet ◽  
Effects Of Aging ◽  
Dark Blue

AbstractThe adsorption of the anionic dye Congo Red (CR) by Na-, Cs-, Mg-, Cu-, Al- and Fe-montmorillonite was investigated by electronic spectroscopy. Spectra of the aqueous suspensions of different clay concentrations and different loadings were recorded. The spectra were curve fitted and were compared to spectra of aqueous solutions of CR at different pH values. Four bands representing anionic varieties and two representing protonated varieties of CR were identified in spectra of CR-treated Na-, Cs-, Mg-, Cu- and Al-montmorillonite. Spectra of CR-treated Femontmorillonite were slightly different, showing three bands representing anionic varieties and four representing protonated CR. The ratio between areas of bands, which represent the protonated varieties, and those representing the anionic varieties were determined showing correlation with the acidity of the metallic cation. The clay in the aqueous suspensions became coloured after the adsorption of CR. The following stainings were obtained, Na- and Mg-clay, red, Cs-clay, violet-red, Cu-clay, reddish-violet, Al-clay, dark violet and Fe-clay, dark blue. It appears that CR can serve as an indicator of the surface acidity of montmorillonite. The effects of aging on the sorption of the dye and on the surface-acidity of the CR-clay complex were investigated.

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 Operating Conditions Optimization via the Taguchi Method to Remove Colloidal Substances from Recycled Paper and Cardboard Production Wastewater

Membranes ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 170 ◽  
Author(s):  
Mayko Rannany S. Sousa ◽  
Jaime Lora-García ◽  
María-Fernanda López-Pérez ◽  
Asunción Santafé-Moros ◽  
José M. Gozálvez-Zafrilla
Keyword(s):  
Taguchi Method ◽  
Flow Velocity ◽  
Cross Flow ◽  
Rejection Rate ◽  
Transmembrane Pressure ◽  
Optimal Conditions ◽  
Permeate Flux ◽  
Utility Concept ◽  
Cross Flow Velocity ◽  
Response Variables

Optimization of the ultrafiltration (UF) process to remove colloidal substances from a paper mill’s treated effluent was investigated in this study. The effects of four operating parameters in a UF system (transmembrane pressure (TMP), cross-flow velocity (CFV), temperature and molecular weight cut-off (MWCO)) on the average permeate flux (Jv), organic matter chemical oxygen demand (COD) rejection rate and the cumulative flux decline (SFD), was investigated by robust experimental design using the Taguchi method. Analysis of variance (ANOVA) for an L9 orthogonal array were used to determine the significance of the individual factors, that is to say, to determine which factor has more and which less influence over the UF response variables. Analysis of the percentage contribution (P%) indicated that the TMP and MWCO have the greatest contribution to the average permeate flux and SFD. In the case of the COD rejection rate, the results showed that MWCO has the highest contribution followed by CFV. The Taguchi method and the utility concept were employed to optimize the multiple response variables. The optimal conditions were found to be 2.0 bar of transmembrane pressure, 1.041 m/s of the cross-flow velocity, 15 °C of the temperature, and 100 kDa MWCO. The validation experiments under the optimal conditions achieved Jv, COD rejection rate and SFD results of 81.15 L·m−2·h−1, 43.90% and 6.01, respectively. Additionally, SST and turbidity decreased by about 99% and 99.5%, respectively, and reduction in particle size from around 458–1281 nm to 12.71–24.36 nm was achieved. The field-emission scanning electron microscopy images under optimal conditions showed that membrane fouling takes place at the highest rate in the first 30 min of UF. The results demonstrate the validity of the approach of using the Taguchi method and utility concept to obtain the optimal membrane conditions for the wastewater treatment using a reduced number of experiments.

Biosorption of Congo red and Indigo carmine by nonviable biomass of a newDietziastrain isolated from the effluent of a textile industry

2013 ◽  
Vol 51 (28-30) ◽  
pp. 5840-5847 ◽  
Author(s):  
Papita Das Saha ◽  
Puspita Bhattacharya ◽  
Keka Sinha ◽  
Shamik Chowdhury
Keyword(s):  
Congo Red ◽  
Textile Industry ◽  
Indigo Carmine

Active manganese oxide: a novel adsorbent for treatment of wastewater containing azo dye

2009 ◽  
Vol 60 (12) ◽  
pp. 3017-3024 ◽  
Author(s):  
S. Chakrabarti ◽  
B. K. Dutta ◽  
R. Apak
Keyword(s):  
Manganese Oxide ◽  
Congo Red ◽  
Textile Industry ◽  
Azo Dye ◽  
Sodium Sulphate ◽  
New Variety ◽  
Freundlich Isotherms ◽  
Adsorption Data ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order

A new variety of active manganese oxide was prepared, characterized, and tested for its potential of adsorbing Congo Red, a dis-azo dye, from aqueous solutions. Both equilibrium and kinetics were investigated over different values of process parameters such as temperature (25–45°C), adsorbent loading (0.4–0.6%), initial dye concentration (50–500 mg/L), presence of salts (sodium sulphate, 500 mg/L) and the oxygen content (MnOx, x = 1.2, 1.33 and 2) of the adsorbent. The equilibrium adsorption data were fitted to Langmuir and Freundlich isotherms. Langmuir adsorption capacity of the sorbent (x = 1.33) for Congo Red was 38.6 mg/g at room temperature which is substantially higher than those for commercial manganese dioxide, red mud, coir pith, activated carbon, and fly ash. The kinetic data were best interpreted using a pseudo-second order model. The results show that the active manganese oxide used in this work removes the dye by reversible adsorption and has the potential for practical use for remediation of textile industry effluents.

A high-efficiency ultrafiltration nanofibrous membrane with remarkable antifouling and antibacterial ability

2018 ◽  
Vol 6 (31) ◽  
pp. 15191-15199 ◽  
Author(s):  
Zhuo Chen ◽  
Xuan-ang Du ◽  
Yang Liu ◽  
Yanyun Ju ◽  
Shaokun Song ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
High Efficiency ◽  
Ultrafiltration Membrane ◽  
Nanofibrous Membrane ◽  
Permeate Flux ◽  
Antibacterial Ability ◽  
Antifouling Ability

The amphiphilic multi-arm f-PPTA modified ultrafiltration membrane exhibited super-high permeate flux, and remarkable antifouling ability and antibacterial activity.

scholarly journals Hydrodynamics and mass transfer with gel formation in a roll type ultrafiltration membrane

2018 ◽  
Vol 6 (2) ◽  
pp. 350-357 ◽  
Author(s):  
Sergey Babenyshev ◽  
Sergey Babenyshev ◽  
Pavel Nesterenko ◽  
Pavel Nesterenko ◽  
Andrey Bratsikhin ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Raw Materials ◽  
Ultrafiltration Membrane ◽  
Theory And Practice ◽  
Cottage Cheese ◽  
Gel Formation ◽  
Permeate Flux ◽  
Roll Type ◽  
Skimmed Milk ◽  
Milk Solids

At this point in history, mankind faces a daunting challenge: how are we to produce high-grade foods without damage to the environment? The only possible rational solution lies in the efficient use of natural raw materials. However, the practical side of the matter cannot be resolved without innovative food equipment designed on the basis of the latest scientific achievements. The current research features the theory and practice of curd whey and skimmed milk ultrafiltration. It focuses on the main operating parameters of the equipment involved and the maximum permissible value of the milk solids content. The experiment included whey, obtained as a byproduct of cottage cheese processing, and skimmed milk, obtained by whole milk separation. The membrane method in the processing of secondary dairy raw materials allows for an environmentally-friendly waste-free production. It is a promising trend in the modern food industry: it creates opportunities for a large range of novel dairy products, beverages, and animal feed, as well as for other sustainable technologies. The paper describes how the volume of permeate flux mass transfer and the selectivity of polysulfonamide ultrafiltration membranes (PSA-20 and PSA-50) depend on the volume of operating load and circulation rate during whey and skimmed milk separation. The authors analyzed the mass transfer and the hydrodynamics in the channel of a roll type baromembrane, including the gel formation process. They established the influence of the milk solids weight ratio in the liquid polydisperse system on the permeate flux volume and the selectivity of the polysulfonamide ultrafiltration membrane (PSA-50).

Characteristic and Performance of Polyvinylidene Fluoride Membranes Blended with Lithium Chloride in Direct Contact Membrane Distillation

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
S. O. Lai ◽  
K. C. Chong ◽  
K. M. Lee ◽  
W. J. Lau ◽  
B. S. Ooi
Keyword(s):  
Lithium Chloride ◽  
Direct Contact ◽  
Polyvinylidene Fluoride ◽  
Membrane Separation ◽  
Polymeric Materials ◽  
Membrane Distillation ◽  
Inversion Method ◽  
Permeate Flux ◽  
Separation Processes ◽  
Direct Contact Membrane Distillation

Membrane distillation (MD) is one of the recent rising membrane separation techniques adopted in the desalination and wastewater treatment. Unlike other pressure-driven separation processes such as reverse osmosis and nanofiltration, MD is a thermal-driven process which involves vapor pressure difference across the feed and permeates solutions. As such, MD requires low energy consumption. Hydrophobic polymeric materials such as polyvinylidene fluoride (PVDF) are frequently used in direct contact membrane distillation (DCMD) due to low surface energy and promising thermal resistance. In this study, the DCMD hollow fiber membranes were separately prepared with PVDF and PVDF blended with lithium chloride (LiCl) through dry/wet phase inversion method. Subsequently, the membranes were used in a DCMD process to remove sodium chloride (NaCl) under different feed inlet temperatures to examine the effect of LiCl additives on the neat membrane. The result showed that by adding LiCl into the neat membrane solution, the finger-like structure was change to a sponge-like structure with microvoids. Furthermore, the performance of the LiCl additive membrane in term of permeate flux was found to be 20% higher compared to that of the neat membrane. Other results of the membrane characteristics were also discussed.      

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