Research Abstracts

Osmotic evaporation is a membrane process that has fascinating advantages over conventional processes for the production of fruit juice concentrates since it has the ability to concentrate solutes to very high levels with minimal thermal or mechanical damage. Our purpose was to compare and analyse t

The aim of the study was to compare potato and potato–tapioca hydrolysate quality obtained by membrane filtration with the application of tubular ceramic membranes. The substrate for membrane filtration was maltodextrins obtained by enzymatic hydrolysis of potato and a mixture of potato and tapioca

The organic ion exchangers (Dowex HCR-S, Dowex 50WX-2) and inorganic ion exchangers with phosphate functional groups (zirconium phosphates ZrP-1, ZrP-2) were studied as transport media for ion-exchange-assisted electrodialysis of diluted solutions containing Cu (II) ions. The ion-exchange and electr

Extraction of gold (III) ions from aqueous solutions by two types of emulsifier using the emulsion liquid membrane technique was investigated. Experimental results for the batch extraction of gold (III) ions using a surfactant liquid membrane technique are presented. A comparison was made between a

Characteristic features of ultrafiltration water treatment and water treatment using ultrafiltration in combination with complexation for water polluted with U(VI) were investigated. Polyethylenimine (PEI) was used as the complexing agent. The relationship of U(VI) removal as a function of pH and th

Some results on metal ions removal from wastewaters using water-soluble polymers such as polyethylenimine (PEI), polyacrylic acid (PAA), polyacrylic acid sodium salt (PAASS) and poly(dimethylamine-co-epichlorohydrin-coethylene-diamine) (PDEHED) as chelating agents and the Cu2+ ion as the model in co

The transport of cobalt (II) ions through bulk liquid membrane containing di(2-ethylhexyl) phosphoric acid (D2EHPA) in kerosene as mobile carrier and protons as counterions in the product phase (H2SO4) was studied. The transport kinetics was analysed by means of a kinetic model involving two consecu

Carboxyl methyl cellulose (CMC) as a water-soluble metal-binding polymer in combination with ultrafiltration (UF) was used in a hybrid approach for selective removal and recovery of copper from water. In the complexation–UF process the cationic forms of heavy metals were first complexed by a macro l

The membrane method combined with complexation was applied for hazardous wastes containing radioactive substance processing. Such complexing agents like soluble chelating polymers and cyanoferrates of transient metals, tested and selected in the laboratory, were used to bind radioactive ions and to

The removal of nickel ions from diluted solution using some ion-exchange resins (Dowex MSC-1, Purolite C 100E, KU 2-8 and Dowex HCR-S) was studied. The purification process involved the use of an electrodialysis-type cell in which the centre compartment was filled with a packed bed of ion-exchanger