Permeability

Sulfur dioxide (SO2) and carbon dioxide (CO2) emissions have to be efficiently controlled due to environmental, economic and social demands. An interesting approach for SO2 and CO2 separation/concentration is the use of supported ionic liquid membranes (SILMs). Ionic liquids (ILs) are very interesti

The characterization and gas transport properties (i.e., permeability, diffusivity, and solubility) of poly(lactic acid) (PLA) blend membranes were systematically investigated. PLA blends had a glass transition temperature of 60 C, a crystallization temperature of 116 C, and a melting temperature

Sludge from five full-scale flat-sheet submerged membrane bioreactors has been analysed with reference to the key biochemical fouling characteristics of soluble microbial product (SMP) and extracted extracellular polymeric substances (EPS). Correlations have been produced between these parameters, a

A series of thermo-sensitive polyurethane-NIPAAm hydrogel membranes with various cross-linking densities have been obtained by the UV-curable method. Sucrose, β-cyclodextrin and dextran were used as the model compounds to evaluate the solute permeability through the hydrogel membranes. The solute pe

Membrane fouling is one of the main factors affecting the diffusion of membrane bioreactors to wastewater treatments. Fouling is generally held to persist above a so-called “critical flux”, below which a steady-state membrane permeability is assumed to be attainable. However, a number of recent stud

A novel method for measuring local permeabilities of gas or vapor in polymers was proposed and developed. The method utilizes a thin reactive layer of potassium prepared on one side of the examined polymer film. Molecules of an appropriate gas (oxygen, water vapor) diffusing through the film corrode

The emf method has been compared with the conductometric one in determining the apparent electrolyte permeability of membrane ( ). It has been found that this method is limited to the membranes of low permeability ( of the order 10!7 m/s). In order to obtain the real permeability coefficient (Ps), t

Polysulfone membranes were prepared via the diffusion-induced phase inversion process from casting solutions consisting of polysulfone, dimethyformamide, and polyvinyl pyrrolidone as a polymeric additive. The effect of PVP added in casting solutions was analyzed by measuring the prepared membranes’

The aim of this study was to evaluate how defects in a membrane surface can affect the molecular weight cut-off (MWCO) and the membrane permeability as they are traditionally defined. These two parameters are important criteria for the selection of ultrafiltration membranes with regard to efficiency

Recent progress in membrane technology, combined with increasing concern about environment protection, led industrialists and researchers to the development of advanced treatments for domestic wastewater. Membrane bioreactor technology seems to be promising. This study is performed in the context of