Research Abstracts

It is found that under certain conditions (a dilute solution, a relatively small inter-membrane distance, and a significant forced convection), the contribution of the gravitational convection in the ion transfer is negligible. Considerable electroconvective mixing of the depleted solution starts at

Boron removal from desalinated seawater is studied. Electrodialysis with improved ionic spacers and modified anion exchange membranes is used for this purpose.

Strong partitioning in polyamide negatively affects the rejection of organic contaminants in RO and NF filtration. The effect may be significant for larger contaminants having low solubility in water. In extreme cases this may counterbalance the sieving effect and limit the applicability of RO/NF to

The results obtained showed that the nanofiltration process did not demineralize completely the whey. However, the best results were obtained with the Ds-5 DL membrane. In this case, the monovalent ions rejection, except from chloride ions, was between 20 and 30%. For chlorides ions, the rejections

The results of experiments of both types yields thus a comprehensive picture of ion transport in a polyamide film including structural parameters of the film. The parameters obtained by the proposed technique can be used as input for theoretical transport models in simulations of desalination, softe

As far as the reduction of the environmental impact of production processes is concerned, the management of liquid wastes of high salinity remains a key point. In this paper, the possibility to use electrodialysis for the improvement of the management of such problematic liquid wastes is investigate