By using a 2dm² electrodializer, an experiment was carried out for a fifty days without electriccurrent to investigate the effect of qualities of four treated sea waters on the adhered matter of membrane.
The followings were made clear by the investigation on the sea water quality, the pressure rise in the electrodializer, the adhesion rate of suspended matter and the composition of adhered matter:
1) The qualities of the first and the second sand filtrate were changed in the turbidity of the raw sea water. But the quantity of filtrate by superfiltration membrane was stable, and a longrun operation seemed to be possible.
2) The quality difference between the treated sea water by ozone the first sand filtered sea water was not recognized, but the adhesion rate of the former was considerably smaller than the latter.
3) The term of continuous operation was estimated by an experimental equation concerning the MFT (membrane filtration time).
4) The adhesion rate of suspended matters of the membrane and the spacer was decreased in the order of the first sand filtrate, the second sand filtrate, the ozone treated sea water and the super filtration membrane filtrate, and these ratios were 100:50:30:18.
5) The composition of the adhered matters of the membrane and the spacers was principally organic matters in the super filtered sea water, and all filtrates adhered matters were similar to those of salt-making factories.