Research Abstracts

This paper discusses the aeration aspect of an ultrafiltration application involving immersed membranes creating an airlift pattern. The continuous aeration commonly used with immersed membranes to mitigate the effects of fouling was compared with several new aeration configurations. These new aerat

The application of ultrafiltration technology for drinking water production has shown rapid development from the beginning of the 1990s. There has been a constant cost reduction of this technology over the last ten years allowing evolution (new polymers, new module designs, etc.), and a decrease of

This paper first presents a set of experimental data on the measurements of the ionic fluxes through a cationexchange membrane separating two electrolyte solutions with the same concentration, the same co-ion but different counter-ions (bi-ionic system). Then these results are compared with the theo

Electrokinetic and electrochemical characterisations of a composite polyamide/polysulfone membrane (PAC1) were carried out by measuring the streaming potential along the membrane surface (polyamide active layer) and the membrane potential at different pHs (3<pH<9). These results allow the determinat

A study of the membrane zeta potential determined by the streaming potential was made to investigate the electrokinetic characterization as well as the monitoring for cake deposition on the surfaces of a filtration membrane. The membrane zeta potential related to the surface charge characteristics w

The syndiotactic polystyrene membranes containing the δ-form which is a clathrated crystal with some solvent molecules as a guest and so-called “complex”, were prepared by casting from its toluene solution at 85°C and room temperature. In order to evaluate the thermal stability of the complex in the

It has been reported that the membrane charge of amphoteric membranes such as inorganic membranes depends on the pH and the electrolyte in the bulk solution. To explain these phenomena, we have proposed the advanced amphoteric membrane (AAM) model where the effective membrane charge is determined by

The Horvath-Kawazoe (HK) model is widely used to characterize microporous carbons and zeolites. The use of the HK model in this application has been extensively studied and interaction parameters exist to relate gas adsorption isotherms to the microporosity of these materials. However, interaction p

Water vapour sorption kinetics in a H+ form naphtalenic sulfonated polyimide membrane at 25°C has been investigated by using an electronic microbalance (IGA, Hiden). An effective diffusion coefficient Dexp has been calculated from kinetic data by using the Fickian model for the final part of the sor

Electron spin resonance (ESR) technique was used to study cellulose acetate (CA) membranes for reverse osmosis (RO) and polyethersulfone (PES) membranes for ultrafiltration. TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy – free radical) was used as a spin probe that was brought into the membranes by im