Description of fouling, surface changes and heterogeneity of membranes by color-based digital image analysis

Palencia, Manuel; Lerma, Tulio A.; Palencia, Víctor J.

doi:10.1016/j.memsci.2016.02.057

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…4). Palencia et al [42] implemented a surface color index ( ) based on a RGB-color model describing the changes in the amount of color on the membrane surface during the filtration of aqueous extracts of plant leaves. The weakness of this method is that adequate fouling descriptor experiments must be designed for each case.…”

Section: Image Analysismentioning

confidence: 99%

A review of in situ real-time monitoring techniques for membrane fouling in the biotechnology, biorefinery and food sectors

Rudolph

Virtanen

Ferrando

et al. 2019

Journal of Membrane Science

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Pressure-driven membrane processes are often used for the separation and purification of organic compounds originating from biomass. However, membrane fouling remains a challenge as these biobased streams have a very complex composition and comprise a high fouling tendency. Conventional, the fouling is monitored based on either a decrease in flux or an increase in pressure over time. Those conventional techniques provide no information on the location, composition or amount of fouling. As fouling is often cumulative, it will be detected as a loss of performance. Once fouling becomes irreversible, it is often not possible to clean the membrane without chemicals and the filtration/separation process has to be stopped eventually. In situ real-time monitoring of membrane fouling could provide dynamic information on the development of fouling, allowing optimization of the process. This paper reviews the state of the art in in situ monitoring techniques that could be applied to membrane processes in the biotechnology, biorefinery and food sectors and briefly reflects on the current awareness of in situ monitoring techniques among experienced industrial users of membrane processes. The physical principles as well as the strengths and weaknesses are addressed, and potentially, promising techniques are identified.

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Section: Image Analysismentioning

confidence: 99%

A review of in situ real-time monitoring techniques for membrane fouling in the biotechnology, biorefinery and food sectors

Rudolph

Virtanen

Ferrando

et al. 2019

Journal of Membrane Science

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“…In order to complete the Tequila samples' characterization, it was considered to use the average surface color index ( ) for RGB space to describe the changes in color intensity and turbidity on the surface of a sample [42]. Due to a digital image is a two-dimensional collection of data, three values associated with vectors R, G, and B for each pixel, mean values can be calculated for the same phase and, in consequence, a total vector can be calculated to describe the entire surface.…”

Section: Digital Image Analysismentioning

confidence: 99%

Electronic Eye for Identification of Tequila Samples

Gómez

Bueno

Gutiérrez

2020

The 1st International Electronic Conference on Biosensors

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The present work reports the potential of a bio-inspired system based on spectrometry, also known as Electronic Eye (EE), capable of detecting different Tequila samples. The reported system analyzes small volumes of Tequila Reposado and Blanco by calculating samples’ absorbances, using a low cost and portable instrumentation employing a CCD camera. The absorbance imaging method consisted of exciting samples with light passes through an 8MP camera connected to a Raspberry Pi Card. The camera’s image data are analyzed using MATLAB 2018b to be represented in Red, Green and Blue (RGB) components for each pixel, in order to get an approximation of the absorbance and the Surface Color Index (Isc) associated with sample concentration. Using the developed EE, it was possible to identify seven different kinds and brands of Tequila. From the obtained results, it was observed that the average absorbance of the Tequila Reposado was greater than the absorbance of the Tequila Blanco. Otherwise, with the Isc, the Tequila Blanco color index is lower concerning the Tequila Reposado’s. Finally, the EE allowed the identification of Tequila samples with reproducibility and repeatability.

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“…In order to evaluate the stability of system, feed, membrane and stripping membrane were monitored by color-based digital image analysis. [31,32] In this case, digital image of different compartments of membrane system are recorded in digital format using a Nikon model Coolpix P530 coupled to sample holder with homogeneous luminosity (uniformity in the luminosity is achieved by white light sources around sample holder). After, images are processed and analyzed using the software Digital-Micrograph 3.7.0 (Gatan inc.).…”

Section: Study Of Distribution and Transport Of Polyphenols By Bulk Liquid Membranementioning

confidence: 99%

“…After, images are processed and analyzed using the software Digital-Micrograph 3.7.0 (Gatan inc.). [31,32] In addition, sub-samples of phases were analyzed by infrared spectroscopy by attenuated total reflectance (ATR-FTIR, IR-Affinity-1) with SeZn crystal. Since feed and stripping phases are aqueous systems, with a relatively low concentration of solutes, spectra were transformed and analyzed functional-enhanced derivative spectroscopy or FEDS transform (FEDS) in order to increase the spectral resolution and achieve the identification of highly overlapped signals.…”

Section: Study Of Distribution and Transport Of Polyphenols By Bulk Liquid Membranementioning

confidence: 99%

Study of time-dependent diffusion coefficient membrane systems and its application to extractions from sugarcane bagasse

Palencia¹,

Mora²,

Lerma³

2019

J. Sci. Technol. Appl.

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It is widely recognized that the mathematical modeling of mass transfer in membrane processes is an essential component not only for understanding the underlying mechanisms associated with the transport, but also that is a powerful tool for design, cost estimation, control and scale-up of extraction processes. Here, a simple methodological approach for the study and description of diffusional changes during the extraction and transport processes in liquid membrane systems is developed and evaluated in the extraction and transport of gallic acid from aqueous solutions. It is concluded that, in comparison with the use of flux and distribution coefficient in function on time, a more sensitive description of diffusion coefficient can be performed using mass-transport coefficient in function on the time. In addition, it is concluded that, during the polyphenol extraction by liquid membrane based on castor oil and Cyanex 921, transportation can be affected by dissolution of membrane phase in the feed phase, and evidenced by a negative value of g in function of time. Diffusion coefficientLiquid membrane Mass-transport coefficient Coupled transport M.

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Description of fouling, surface changes and heterogeneity of membranes by color-based digital image analysis

Cited by 10 publications

References 33 publications

A review of in situ real-time monitoring techniques for membrane fouling in the biotechnology, biorefinery and food sectors

A review of in situ real-time monitoring techniques for membrane fouling in the biotechnology, biorefinery and food sectors

Electronic Eye for Identification of Tequila Samples

Study of time-dependent diffusion coefficient membrane systems and its application to extractions from sugarcane bagasse

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