Nanocolloid cake properties determined from step‐up pressure filtration with single‐stage reduction in filtration area

Iritani, Eiji; Katagiri, Nobuyuki; Nakajima, Ryota; Hwang, Kuo‐Jen; Cheng, Tung-Wen

doi:10.1002/aic.14967

Cited by 13 publications

(4 citation statements)

References 59 publications

(75 reference statements)

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“…The specific resistance α av,i can be advantageously represented by an empirical correlation similar to Eq. in the form :

true α_{normalav normal, normali} = α_{1} \frac{(1 - n_{1}) (\frac{Δ p_{c}}{p_{a, 1}})}{{(1 + \frac{Δ p_{normalc}}{p_{normala normal, 1}})}^{1 - n_{1}} - 1}

…”

Section: Theorymentioning

confidence: 99%

“…The C‐P data were successfully obtained with high accuracy by using the thus‐determined ε av . The method has been improved over the years , , and at present the pressure dependence of α av and ε av can be accurately determined from the flux decline behavior in step‐up pressure filtration by using a filter with a single‐stage reduction in the effective filtration area .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Consolidation Behavior by Combined Membrane Filtration and Stepped Cake Compression

2017

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A method is proposed for determining the compression-permeability (C-P) data expressed as the dependences of the local specific cake resistance and local cake porosity on the solid compressive pressure from a combined membrane filtration and stepped cake compression test. Filtration employing a membrane with a high flow resistance, which provided the pressure dependence of the average specific cake resistance, was followed by step-up compression, which gave cake porosities at several compressive pressures. On the basis of these data collected as the time variation of the dewatering volume, the compression-permeability data of bentonite slurry were evaluated. Consolidation behaviors of the filter cake and semi-solid material were accurately described on basis of the C-P data.

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“…The specific resistance α av,i can be advantageously represented by an empirical correlation similar to Eq. in the form :

true α_{normalav normal, normali} = α_{1} \frac{(1 - n_{1}) (\frac{Δ p_{c}}{p_{a, 1}})}{{(1 + \frac{Δ p_{normalc}}{p_{normala normal, 1}})}^{1 - n_{1}} - 1}

…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Consolidation Behavior by Combined Membrane Filtration and Stepped Cake Compression

2017

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“…By assuming that the resistance of the filter medium is negligible, and the porosity of the cake is constant, the filtration theory can be linearized so that the permeability of the cake can be evaluated using linear fitting of the test data, that is, the linear plot of t/V versus V at a constant filtration pressure, where t and V are the filtration time and the volume of the filtrate respectively. The associated testing technique chiefly involves a filtration cell of constant pressure (Tien et al 2001), of stepped pressure (Murase 1989;Tarleton 2004;, or with the functionalities of sudden reduction in the filtration area (Murase et al 1987;Iritani et al 2015). Since the assumptions leading to the linearized theory are valid only for the latter part of the filtration test, the data obtained from the initial part of the test, that is, the gradual variation of the effective pressure drop across the cake with the time, are wasted.…”

Section: Introductionmentioning

confidence: 99%

A new approach for determining compressibility and permeability characteristics of dredged slurries with high water content

et al. 2022

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In the vacuum treatment of dredged slurries via prefabricated vertical drains (PVDs), both filtration and consolidation may happen to them when subjected to the vacuum gradient. Similar to the consolidation, the filtration may provide equally useful information on interpreting the constitutive behavior of the slurry. In this paper, a new approach utilizing the filtration process is devised to evaluate the constitutive behaviors of dredged slurries. The approach is composed of a vacuum filtration device and an iterative curve fitting algorithm. Two types of tests, namely step-vacuum filtration and constant-vacuum filtration followed by compression test, must be conducted on the slurry specimens, and only the time variations of the filtrate discharge should be recorded. On the basis of the recorded data, the curve fitting algorithm is adopted for determining the parameters of the constitutive equations. The effectiveness of the proposed approach is verified through comparing the obtained compressibility and permeability of the slurries with the data provided by the oedometer test and with the empirical relationships from different sources. The comparisons demonstrate that the constitutive relationships determined by the present approach can predict the compressibility and permeability characteristics of dredged slurries with an acceptable degree of accuracy.

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“…As the most severe membrane fouling occurs in the dead-end mode, it is desirable to examine dead-end microfiltration behaviors in detail to clarify the role of the filter cake. Recently, several dead-end mode filtration tests have been proposed to accurately and simply determine the cake characteristics [ 8 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Among the cake characteristics, both the average specific cake resistance and average cake porosity, being related to the filterability, are recognized as the most important factors controlling membrane filtration behaviors.…”

Section: Introductionmentioning

confidence: 99%

Yeast Cell Cake Characterization in Alcohol Solution for Efficient Microfiltration

et al. 2021

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Microfiltration is widely used to remove microbial cells from the fermentation broth in the downstream processing of biotechnological products. Because filtration behaviors are strongly affected by the characteristics of the microbial cell cake formed on the surface of the membrane, insights into the cake structure facilitate the design and operation of filter equipment and membranes. In the alcohol fermentation process using a yeast strain, the cake characteristics are considered to be complicated because yeast cells are strongly influenced by external factors such as filtration pressure and alcohol concentration. In this study, we evaluated the membrane filtration properties, in particular the cake characteristics of a yeast suspension containing alcohol. Microfiltration experiments were performed in the dead-end filtration mode using yeast suspensions with several ethanol concentrations (0–20 wt%) under constant pressure. Flux decline behaviors caused by yeast cake were put in a similar form for 0–15 wt% ethanol concentrations. In contrast, a severe flux decline was observed for the suspension with 20 wt% ethanol concentration. It was also observed that in the membrane filtration of yeast cells with 20 wt% ethanol concentration, the cake structure became denser and the filtration resistance remarkably increased because of cellular destruction. Furthermore, the yeast cake exhibited a high compressibility in the solution containing a 20 wt% ethanol concentration. Therefore, the filtration rate of the alcoholic fermentation broth is not significantly improved by increased pressure due to the increase in the cake resistance.

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Nanocolloid cake properties determined from step‐up pressure filtration with single‐stage reduction in filtration area

Cited by 13 publications

References 59 publications

Evaluation of Consolidation Behavior by Combined Membrane Filtration and Stepped Cake Compression

Evaluation of Consolidation Behavior by Combined Membrane Filtration and Stepped Cake Compression

A new approach for determining compressibility and permeability characteristics of dredged slurries with high water content

Yeast Cell Cake Characterization in Alcohol Solution for Efficient Microfiltration

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