This study presents mass transfer modeling of solvent extraction by membrane contactors. The extraction system was a membrane contactor, an aqueous solution of ethanol and acetone as the feed and a near-critical phase of carbon dioxide as the solvent. Model was based on solving conservation equations for solutes in the membrane contactor. The equations of the model were solved by numerical meth...

Dairy wastewater is enriched in organic matter (about 45-72 g/l, COD) and also contains biodegradable carbohydrates. A three-stage system, NRBC was fabricated as a bench scale unit for lab experiments, to remove organic carbon from the whey. The fabricated NRBC had several advantages, such as quick start-up, high biomass concentration and was additionally able to handle high organic loading rat...

The removal performance of total poly phenols and orthodiphenols (o-diphenols) content in olive mill waste (OMW) was investigated with a three stages cross flow laboratory scale rotating biological contactor (RBC) in the present study. Due to high COD and other pollutant in the original OMW, physico-chemical treatment was effected for COD and other pollutant reduction prior to biological tr...

In the past, tactile displays were of one of two kinds: they were either shape displays, or relied on distributed vibrotactile stimulation. A tactile display device is described in this paper which is distinguished by the fact that it relies exclusively on lateral skin stretch stimulation. It is constructed from an array of 64 closely packed piezoelectric actuators connected to a membrane. The ...

Extraction of heavy metals in membrane contactors was investigated theoretically in this study. Extraction of Cu2+ with a kerosene solution of di(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. Simulations were performed using computational fluid dynamics of mass and momentum transfer in all subdomains of a circular membrane contactor. The membrane contactor consists of three sections: lume...

Liquid phase mass transfer rates kLS for the absorption of oxygen in tap water and in aqueous ionic solutions have been determined in two closed stirred tank contactors for a power input between 3 and 70 W/kg and (impeller diameter)f(tank diameter) ratios DifT of 0.3, 0.35 and 0.4. The contactors had diameters of 0. I9 and 0.6 m. The dispersed phase fraction was 1% by volume in all experiments....

This work aims at the development of a dynamic model for the mathematical description of facilitated transport separation processes carried out in membrane contactors where mass transport phenomena are coupled with chemical reactions. A general model that takes into account the description of all possible mass transport steps and interfacial chemical reactions is initially presented, allowing i...

Using a pin-array type tactile display as a stimulator of the finger pad, a psychophysical study was conducted on the vibrotactile perception. The passive touch with vibratory stimuli in the low frequency could be an alternative of the active touch for the presented stimuli: polygons, round shapes and gratings. As for the effect of frequency on the texture discrimination, the high correct answe...