Performance characterization and steady-state modelling of spinning basket membrane module
TL;DR: In this paper, the performance of this module has been reported in the ultra-filtration operation and it is a special type of shear-enhanced device with inbuilt cleaning facility.
Abstract: Spinning basket membrane module is a special type of shear-enhanced device with inbuilt cleaning facility. In this article, the performance of this module has been reported in the ultrafiltration o...
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18 May 2021
TL;DR: In this paper, a review of different phenomenological and non-phenomenological models for permeate flux prediction in UF, and a comparison, between selected models, of the predictive capacity.
Abstract: In any membrane filtration, the prediction of permeate flux is critical to calculate the membrane surface required, which is an essential parameter for scaling-up, equipment sizing, and cost determination. For this reason, several models based on phenomenological or theoretical derivation (such as gel-polarization, osmotic pressure, resistance-in-series, and fouling models) and non-phenomenological models have been developed and widely used to describe the limiting phenomena as well as to predict the permeate flux. In general, the development of models or their modifications is done for a particular synthetic model solution and membrane system that shows a good capacity of prediction. However, in more complex matrices, such as fruit juices, those models might not have the same performance. In this context, the present work shows a review of different phenomenological and non-phenomenological models for permeate flux prediction in UF, and a comparison, between selected models, of the permeate flux predictive capacity. Selected models were tested with data from our previous work reported for three fruit juices (bergamot, kiwi, and pomegranate) processed in a cross-flow system for 10 h. The validation of each selected model’s capacity of prediction was performed through a robust statistical examination, including a residual analysis. The results obtained, within the statistically validated models, showed that phenomenological models present a high variability of prediction (values of R-square in the range of 75.91–99.78%), Mean Absolute Percentage Error (MAPE) in the range of 3.14–51.69, and Root Mean Square Error (RMSE) in the range of 0.22–2.01 among the investigated juices. The non-phenomenological models showed a great capacity to predict permeate flux with R-squares higher than 97% and lower MAPE (0.25–2.03) and RMSE (3.74–28.91). Even though the estimated parameters have no physical meaning and do not shed light into the fundamental mechanistic principles that govern these processes, these results suggest that non-phenomenological models are a useful tool from a practical point of view to predict the permeate flux, under defined operating conditions, in membrane separation processes. However, the phenomenological models are still a proper tool for scaling-up and for an understanding the UF process.
14 citations
TL;DR: In this article, the authors presented the modeling, simulation, and characterization studies of a dynamic shear-enhanced (DSE) filtration system with an inbuilt cleaning facility.
Abstract: Membrane-based low-cost recovery of nutritional and therapeutic proteins from wastewater is regarded as a leap towards sustainability. However, membranes are heavily fouled by proteins, and thus, frequent chemical or hydrodynamic cleaning is needed even in the advanced dynamic shear-enhanced (DSE) filtration devices. This article presents the modeling, simulation, and characterization studies of a DSE system, namely the ‘Spinning Basket membrane’ (SBM) module with an inbuilt cleaning facility. The device has been established to be specifically suitable for the recovery of proteins from synthetic wastewater. It can perpetually regenerate the flux with its simple and, moreover, online cleaning facility. A two-parameter transient model, purely based on an analytical approach, has been developed to simulate the device. Moderately low deviation (±12 %) of the simulated flux from the corresponding experimental data obtained from ultrafiltration of synthetic wastewater unambiguously validates the proposed model. The present modeling strategy demonstrates how a DSE filtration system with highly complex modes of mass and momentum transfer could be easily simulated.
1 citations
References
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TL;DR: The recovery of exopolysaccharides produced by Sinorhizobium meliloti bacteria by dynamic microfiltration was investigated using a rotating disk device designed in the laboratory, equipped with a 0.2 microm nylon membrane, and it was found that the permeate flux J(f) for various disks can be correlated by the same function of the mean shear stress at the membrane tau(wm).
Abstract: The recovery of exopolysaccharides (EPS) produced by Sinorhizobium meliloti bacteria by dynamic microfiltration was investigated using a rotating disk device designed in our laboratory, equipped with a 0.2 microm nylon membrane. This system differs from commercially available systems by the presence of vanes on the disk which produce a very important increase in permeate flux while yielding excellent EPS transmission. For polymers produced under standard fermentation conditions (70 h at 30 degrees C), the mass flux rose to 650 g h(-1) m(-2) using a disk equipped with 2 mm vanes rotating at 2000 rpm against 380 g h(-1) m(-2) with a smooth disk at the same speed. The maximum flux observed was 1560 g h(-1) m(-2) with a 6-mm vanes disk rotating at 3000 rpm and a 36 degrees C broth. An interesting finding was that the permeate flux J(f) for various disks can be correlated by the same function of the mean shear stress at the membrane tau(wm) according to J(f) = 4.6 tau(wm) (0.717) for a 30 degrees C broth, showing that the effect of vanes is merely to increase the shear stress by raising the fluid core velocity between the membrane and the disk. With 6-mm vanes the core angular velocity was found to be 84% of disk velocity vs. 45% for a smooth disk. When the fermentation temperature was increased to 36 degrees C to produce a lower molecular weight polymer, the permeate flux rose by about 250%, much more than what could be expected from the reduction in permeate viscosity and followed the same power law with membrane shear stress as for 30 degrees C. The same device was equipped with a PES 50 kDa membrane to concentrate EPS by ultrafiltration. Permeate fluxes were of the order of 160 L h(-1) m(-2) at 2000 rpm and 30 degrees C with nearly complete EPS rejection. Finally, the net electrical power consumed by the disk was measured by subtracting the power consumed without fluid from the power during filtration at the same speed. This power increases with speed and with the presence of vanes, but since the gain provided by the vanes is very high, the specific energy per m(3) of permeate is minimal with the highest vanes tested (6 mm) and maximal for smooth disks.
44 citations
TL;DR: In this paper, the authors discuss the consequences of possible distribution of critical flux (DCF) in cross-flow filtration and describe a normal function with a mean critical flux and its standard deviation.
40 citations
"Performance characterization and st..." refers background in this paper
...On the other hand, the steady-state permeate flux of a standard cross-flow module has been reported to achieve its respective saturation at a TMP of 2.0 kPa only in UF of BSA....
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...0 kPa only in UF of BSA.([39]) Moreover, the maximum steady-state flux of the present studywas as high as 8....
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...[38] Moreover, even in a DSE module with counter-rotating membrane–stirrer assembly, the minimum percentage reduction of permeate flux was reported to be 38% in UF of BSA....
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TL;DR: In this paper, a vibratory shear enhanced processing is used to remove small particles and/or colored natural organic matters contained in the river water with ultrafiltration membranes, which has a unique vibration mechanism much generates shear rates on the surface of the membrane so that it is resistant to fouling caused by poly aluminum chloride (PAC) in the water.
39 citations
TL;DR: In this paper, a commercial centrifugal rotary membrane module was used for ultrafiltration of oil-water emulsions (droplet radius 50-3000nm), and the dominant back transport mechanism was determined by comparing various back transport mechanisms to the permeation drag force.
38 citations
TL;DR: In this paper, a simulation of Poiseuille and Couette flow was performed for a fluid of spherical molecules to examine its rheological properties in thin film lubrication, which showed that the equivalent viscosity of confined fluid increases and goes toward divergence as the two walls are brought close together continuously.
35 citations
"Performance characterization and st..." refers methods in this paper
...following the Couette flow theory instead of the lubrication theory.([35]) Associated simplification has been illustrated in Fig....
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