Prediction of pore fouling by microparticles is still challenging and remains a difficult step to optimize membrane and filtration processes. The scientific issue consists in determining the relevant operation parameters controlling the capture of particles and the clogging of the filter. In this study, we have developed for a dead-end and cross-flow filtration a poly-dimethylsiloxane (PDMS) de...

Nanofiltration (NF) and tight ultrafiltration (tight UF) membranes are a viable treatment option for high quality drinking water production from sources with high concentrations of contaminants. To date, there is limited knowledge regarding the contribution of concentration polarization (CP) and fouling to the increase in resistance during filtration of natural organic matter (NOM) with NF and ...

In this paper, the performance of nanofiltration membrane process in removing Pb(II) from aqueous solution was modeled by the pore flow-concentration polarization model. The model was fabricated based on the simultaneous resolving of Extended Nernst–Planck equation(ENP), film theory, and osmotic pressure model. The effects of various operational parameters such as the applied pressure, feed con...

Lignin fractionation helps its valorization process and yields high-quality -value products. In this study, cascading tangential flow filtration (TFF) was employed for the of lignin molecules. The lignin-rich stream obtained from pretreatment corn stover using alkali (NaOH) cholinium lysinate ([Ch][Lys]) as catalyst. effect TFF (microfiltration, ultrafiltration, nanofiltration) on molecular wei...

BACKGROUND AND OBJECTIVES Infra-renal aortic cross-clamping is associated to renal effects. This study aimed at analyzing halothane, isoflurane and sevoflurane effects on renal function of dogs submitted to infra-renal aortic cross-clamping. METHODS This study involved 30 mixed-breed dogs randomly distributed in three groups, according to equipotent anesthetic doses (0.75 MAC) of inhaled anes...

The production of Schizophyllan by Schizophyllum commune and Scleroglucan by Sclerotium rolfsii is growth associated. Shear stress as a result of the impeller type and rotation speed as well as an optimum but not maximum oxygen supply are the key factors for enhanced production. Batch cultivations resulted maximum yields of 13 g L for both ß-glucans. In oxygen limited chemostats with biomass fe...

Three different mathematical models relating the flux decline were investigated to quantify the effects of pretreatment in a membrane filtration system. The models used are empirical flux decline model, series resistance flux decline model and modified series resistance flux decline model. A cross flow ultrafiltration unit was used to study flux decline and organic removal from synthetic wastew...

The MARAPUR concept is a biological wastewater treatment process based on the MBR functional principle. The ultrafiltration of activated sludge takes place in pressure-driven hollow fiber membranes. The vertical membrane modules are installed compactly in a MEGAMODUL. The permeate extraction is accomplished in the cross-flow, which is supported by rinsing aeration. The main process advantages a...

Production of urine is initiated by fluid and solute flux across the glomerular filtration barrier. Recent ultrastructural studies have shown that under extreme conditions of no filtration, or very high filtration, a restriction to flow is predicted in a space underneath the podocyte cell body or its processes, the subpodocyte space (SPS). The SPS covered up to two-thirds of the glomerular filt...