Ultrafiltration

Ultrafiltration experiments for the optical resolution of racemic phenylalanine were investigated in a DNA solution system and by using immobilized DNA membranes. L-phenylalanine preferentially existed in the permeate solution and D-phenylalanine preferentially existed in the concentrate solution in

In the present work, it is evaluated the influence of temperature and transmembrane pressure on the crude soybean oil permeate flux through a ceramic tubular membrane (pore size 0.01 µm) and a polysulphone hollow fiber membrane (pore size 100 KDa). Temperatures and pressures values are 50, 60 and 70

In the present work, some of the factors that influence the rejection and fouling patterns observed during sugar-beet pulp extract ultrafiltration were examined. This material contained pectins, exhibiting a wide molecular weight distribution and a high tendency for aggregation. A dual pattern in th

Sugar, as the final product of the technology of sugar production, has to satisfy rigorous quality demands. Among others, it means low content of non-sucrose compounds, as well as the smallest possible share of coloured matters. Ultrafiltration and nanofiltration can be one of the solutions for a mo

The adsorption of trace contaminants on natural particles is of great interest as this adsorption enhances the possibility of removing these with low pressure filtration such as MF and UF. This study shows that natural hormones such as estrone and estradiol will adsorb to natural particles both orga

The primary objective of the study described in the present paper was to investigate the problem of how the concentration of organic matter (expressed as dissolved organic carbon, DOC) contributes to the efficiency of separating atrazine form aqueous solutions by ultrafiltration. Another objective w

An in-line coagulation (without settling)/UF process has been studied to improve membrane performance and water quality for surface water treatment. Using coagulation before UF increases permeate quality; the extent of dissolved organic matter removal is controlled by the coagulation step. Efficient

RO seawater systems operating on a surface feed water, originating from an open intake source, require an extensive pretreatment process in order to control membrane fouling. Considerations of long-term membrane performance stability have lead to an initial design concept of operation of seawater RO

Measurements of the rejection of perchlorate anion (ClO4–) were performed using nanofiltration (NF) and ultrafiltration (UF) membranes. Aqueous solutions of perchlorate (at a concentration of 100 µg/L of ClO4– by “spiking” with KClO4) were fed to the membrane test apparatus. Solutions contained only

In this paper the effect of different SRT on the performances of an ultrafiltration pilot MBR operating with real wastewaters was tested to analyse both the ability of the system to remove nutrients and micropollutants and the possible decrease in waste sludge production. Increasing MLSS from 4 to 9