Analysis of obtained results shows that under the conditions of the experiment, the
maximum degree of oxygen saturation of model solutions was 5-6 mg/dm
3
.
However, the uniquely regularity in this process is not observed. The oxygen
content is a rather unstable. It is very sensitive to the conditions of the analysis and
others ions that are present in the solution. Similar experiments were carried out using
capillary filters, but the results are not significantly different from the above mentioned,
so it cannot be asserted that this process is better for using capillary filters.
The effect of aeration on the change in iron ions concentration. In a solution
containing Fe
2+
and Fe
3+
ions, with the increase in the amount of oxygen, the following
dependence is observed: reduction of the divalent form of iron passing into trivalent
form. The results of the study of the influence of the amount of passage of air through
the investigated solutions are shown in Figure 9.
a
b
Figure 9. The dependence of iron ions concentration on the time of aeration
(a) and the effect of iron ions removal of water (b) with iron ions concentration
in the source water 0,65 mg/dm
3
(1), 1 mg/dm
3
(2), mg/dm
3
(3), 5 mg/dm
3
(4),
7 mg/dm
3
(5)
The given dependence describes the reduction of the iron ions content when the
amount of passed air is increased, so with the increase in the volume of the passage of
air, the content of bivalent iron is reduced. The process of oxidation of ion of divalent
iron ions passes almost equally to all samples with different initial concentrations.
Based on the conducted experiments, it was found that to achieve an iron ions
content in water less than 0.3 mg/dm
3
at an initial iron ions concentration of 0.65
mg/dm
3
, the sufficient initial aeration is for 1-5 min. Further aeration of water
practically does not affect the reduction of iron ions content. With an increase in iron
ions content in the source water to 1.0 mg/dm
3
, aeration for 5 minutes allows to reduce
the residual iron content to 0.3 mg/dm
3
; at a concentration of 2,0 mg/dm
3
to achieve
the same concentration, it is necessary to conduct the process for 10 minutes. With an
- 1803 -