Effect of Fluidized Bed on Permeate Flux in Ceramic Membrane Cross-Flow Microfiltration

1995 ◽  
Vol 60 (12) ◽  
pp. 2074-2084
Author(s):  
Petr Mikulášek
Keyword(s):  
Fluidized Bed ◽  
Ceramic Membrane ◽  
Cross Flow ◽  
Experimental System ◽  
Experimental Results ◽  
Spherical Particles ◽  
Permeate Flux ◽  
Model Fluid ◽  
Optimum Porosity ◽  
Tubular Membranes

The microfiltration of a model fluid on an α-alumina microfiltration tubular membrane in the presence of a fluidized bed has been examined. Following the description of the basic characteristic of alumina tubular membranes, model dispersion and spherical particles used, some comments on the experimental system and experimental results for different microfiltration systems are presented. From the analysis of experimental results it may be concluded that the use of turbulence-promoting agents resulted in a significant increase of permeate flux through the membrane. It was found out that the optimum porosity of fluidized bed for which the maximum values of permeate flux were reached is approximately 0.8.

scholarly journals Cross-Flow Microfiltration of Glycerol Fermentation Broths with Citrobacter freundii

Membranes ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 67 ◽  
Author(s):  
Wirginia Tomczak ◽  
Marek Gryta
Keyword(s):  
Colloidal Particles ◽  
Ceramic Membrane ◽  
Fermentation Broth ◽  
Cross Flow ◽  
Transmembrane Pressure ◽  
Citrobacter Freundii ◽  
Permeate Flux ◽  
Glycerol Fermentation ◽  
Fermentation Broths ◽  
The Impact

This paper reports the study of the cross-flow microfiltration (MF) of glycerol fermentation broths with Citrobacter freundii bacteria. A single channel tubular ceramic membrane with a nominal pore size of 0.14 µm was used. It has been demonstrated that the MF ceramic membrane has been successfully applied to bacteria cell removal and to effectively eliminate colloidal particles from glycerol fermentation broths. However, due to fouling, the significant reduction of the MF performance has been demonstrated. In order to investigate the impact of transmembrane pressure (TMP) and feed flow rate (Q) on MF performance, 24 experiments have been performed. The highest steady state permeate flux (138.97 dm3/m2h) was achieved for 0.12 MPa and 1000 dm3/h. Fouling analysis has been studied based on the resistance-in series model. It has been found that the percentage of irreversible fouling resistance during the MF increases with increasing TMP and Q. The permeate flux regeneration has been achieved by membrane cleaning with 3 wt % NaOH and 3 wt % H3PO4 at 45 °C. The results of this study are expected to be useful in industrially employing the MF process as the first step of glycerol fermentation broth purification.

Comparison of ceramic capillary membrane and ceramic tubular membrane with inserted static mixer

2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Igor Gaspar ◽  
Andras Koris ◽  
Zsolt Bertalan ◽  
Gyula Vatai
Keyword(s):  
Specific Energy Consumption ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
High Price ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Water Emulsion ◽  
Oil In Water ◽  
Capillary Membranes ◽  
Tubular Membranes

AbstractOily wastewaters are produced in large amounts in many fields of food, mechanical, and other types of industry. In order to protect the environment, wastewaters must not be discharged directly into sewers. First, they must be cleaned at least down to 50 mg L−1 of oil content (according to Hungarian standard). In previous research, the authors found that oil-in-water emulsions can be separated with filtration using ceramic ultrafiltration tubular membranes. The relatively high price of ceramic membranes can be compensated by the fact that this separation process can be significantly intensified by static mixers inside the tubular membranes. New generations of ceramic membranes are the ceramic capillary membranes. These two different types of membranes and their effects on permeate flux, oil retention and specific energy consumption were compared in this work. The results, obtained with a stable oil-in-water emulsion as feed, showed that the use of novel ceramic capillary membranes at optimal operating cross-flow rate and transmembrane pressure is reasonable. The results have also shown the advantage of static mixing in the lumen side of the membrane tube providing a wider range of satisfactory separation level and increased permeate flux.

Ultrafiltration of activated sludge with ceramic membranes in a cross-flow membrane bioreactor process

2000 ◽  
Vol 41 (10-11) ◽  
pp. 243-250 ◽  
Author(s):  
X-j. Fan ◽  
V. Urbain ◽  
Y. Qian ◽  
J. Manem
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Ceramic Membrane ◽  
Treatment Plant ◽  
Cross Flow ◽  
Ceramic Membranes ◽  
Permeate Flux ◽  
Chemical Cleaning

A cross-flow membrane bioreactor (MBR) for raw municipal wastewater treatment, consisting of a suspended growth bioreactor and a ceramic membrane ultrafiltration unit, was run over a period of more than 300 days in a wastewater treatment plant (WWTP). Sludge Retention Times (SRT) of 20, 10 and 5 days, respectively, and Hydraulic Retention Times (HRT) of 15 and 7.5 hours were tested. Membrane fouling was found to be a function of SRT and permeate flux. Under an SRT of 20 days and flux of 71 l/m2\ · h at 30°C, the MBR was successfully run over 70 days without the need for chemical cleaning. However chemical cleaning had to be undertaken every 3–5 days at shorter sludge retention times (typically an SRT of five days and a flux of 143 l/m2\ · h at 30°C). In this study, fouling materials were removed efficiently through chemical cleaning, with an average permeablity recovery of 87±11%.

Cross-flow microfiltration with high frequency reverse flow

2000 ◽  
Vol 41 (10-11) ◽  
pp. 337-343 ◽  
Author(s):  
M. Héran ◽  
S. Elmaleh
Keyword(s):  
Flow Velocity ◽  
High Frequency ◽  
Ceramic Membrane ◽  
Reverse Flow ◽  
Cross Flow ◽  
The Other ◽  
Treated Wastewater ◽  
Permeate Flux ◽  
Cross Flow Velocity ◽  
Bentonite Suspension

High frequency reverse filtration was evaluated while microfiltering a bentonite suspension, biologically treated wastewater and an activated sludge suspension through a 0.2 μm tubular ceramic membrane. Better results were obtained with a conventional internal layer filtration element than with an external skin membrane. However the technique was efficient in enhancing the permeate flux solely with the bentonite suspension. In the other cases, the flux was the same as in conventional cross-flow operation. Such a failure cannot be exclusively attributed to chemical interactions with the membrane since the permeate flux increased linearly with cross-flow velocity for all suspensions in conventional operation. Much research is then required to establish the technique applicability.

Process combination of nanofiltration and adsorption: optimisation of an air and back flushing procedure

2003 ◽  
Vol 3 (5-6) ◽  
pp. 367-372
Author(s):  
J. Meier ◽  
T. Neymann ◽  
T. Melin
Keyword(s):  
Landfill Leachate ◽  
Cross Flow ◽  
Pilot Scale ◽  
Experimental Results ◽  
Permeate Flux ◽  
Leachate Treatment ◽  
Side Pressure ◽  
New Process ◽  
Major Factors ◽  
Process Combination

A new process combination integrating adsorption on powdered adsorbent into a nanofiltration process is applied to landfill leachate treatment on a pilot scale. Lab scale experiments have shown that the permeate flux is significantly increased by the application of a flushing procedure combining permeate back flushing and feed and air cross flow flushing. In this paper an optimisation strategy for the flushing procedure is described and first experimental results are presented. These results indicate that the cross flow flushing velocity and the number of permeate side pressure pulses are the major factors of the flushing procedure.

scholarly journals Clarification Processes of Orange Prickly Pear Juice (Opuntia spp.) by Microfiltration

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 354
Author(s):  
Jaime A. Arboleda Mejia ◽  
Jorge Yáñez-Fernandez
Keyword(s):  
Suspended Solids ◽  
Cross Flow ◽  
Laboratory Scale ◽  
Prickly Pear ◽  
Permeate Flux ◽  
Color Properties ◽  
Pear Juice ◽  
Opuntia Spp

In this study, fresh orange prickly pear juice (Opuntia spp.) was clarified by a cross-flow microfiltration (MF) process on a laboratory scale. The viability of the process—in terms of productivity (permeate flux of 77.80 L/h) and the rejection of selected membranes towards specific compounds—was analyzed. The quality of the clarified juice was also analyzed for total antioxidants (TEAC), betalains content (mg/100 g wet base), turbidity (NTU) and colorimetry parameters (L, a*, b*, Croma and H). The MF process permitted an excellent level of clarification, reducing the suspended solids and turbidity of the fresh juice. In the clarified juice, a decrease in total antioxidants (2.03 TEAC) and betalains content (4.54 mg/100 g wet basis) was observed as compared to the fresh juice. Furthermore, there were significant changes in color properties due to the effects of the L, a*, b*, C and h° values after removal of turbidity of the juice. The turbidity also decreased (from 164.33 to 0.37 NTU).

CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

2021 ◽  
Author(s):  
Behrad Esgandari ◽  
Shahab Golshan ◽  
Reza Zarghami ◽  
Rahmat Sotudeh‐Gharebagh ◽  
Jamal Chaouki
Keyword(s):  
Fluidized Bed ◽  
Spherical Particles ◽  
Dem Analysis

scholarly journals Data-driven Modelling of Microfiltration Process with Embedded Static Mixer for Steepwater from Corn Starch Industry

2017 ◽  
Author(s):  
Laslo Šereš ◽  
Ljubica Dokić ◽  
Bojana Ikonić ◽  
Dragana Šoronja-Simović ◽  
Miljana Djordjević ◽  
...  
Keyword(s):  
Corn Starch ◽  
Desirability Function ◽  
Specific Energy Consumption ◽  
Cross Flow ◽  
Operating Conditions ◽  
Transmembrane Pressure ◽  
Static Mixer ◽  
Permeate Flux ◽  
Experimental Conditions ◽  
Starch Industry

Cross-flow microfiltration using ceramic tubular membrane was applied for treatment of steepwater from corn starch industry. Experiments are conducted according to the faced centered central composite design at three different transmembrane pressures (1, 2 and 3 bar) and cross-flow velocities (100, 150 and 200 L/h) with and without the usage of Kenics static mixer. For examination of the influence of the selected operating conditions at which usage of the static mixer is justified, a response surface methodology and desirability function approach were used. Obtained results showed improvement in the average permeate flux by using Kenics static mixer for 211 % to 269 % depending on experimental conditions when compared to the system without the static mixer. As a result of optimization, the best results considering flux improvement as well as reduction of specific energy consumption were obtained at low transmembrane pressure and lower feed cross-flow rates.

Power-to-gas: CO2 methanation in a catalytic fluidized bed reactor at demonstration scale, experimental results and simulation

2021 ◽  
Vol 50 ◽  
pp. 101610
Author(s):  
Maxime Hervy ◽  
Jonathan Maistrello ◽  
Larissa Brito ◽  
Mathilde Rizand ◽  
Etienne Basset ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Experimental Results ◽  
Co2 Methanation ◽  
Power To Gas
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