3. FOOD ChEMISTRy & bIOTEChNOLOGy 3.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Food Chemistry & Biotechnology
Fig. 2. Removal of copper and zinc ions from model solutions.
c – concentration of copper and zinc ions, �copper, � zinc,
t – time
In Fig. 3. are present quantities of copper and zinc ions
that iron sulphides were able to capture from 100 ml of solution
in calculation on 1 g weights of dry the sorbent.
Fig. 3. Sorption of copper and zinc ions from model solutions.
q – sorption, �copper,� zinc, t – time
Fig. 4. shows sorption of zinc ions by iron sulphides prepared
in batch-continuous mode (BCM) and in discontinuous
mode (DM) from model solutions. We can see, that “batchcontinuous
sorbent”, which production process is possible to
Fig. 4. Removal of zinc ions using sorbent prepared in 2 different
modes. c – concentration of zinc ions, � batch-continuous
sorbent, � discontinuous sorbent, t – time
s673
see in Fig. 5., was able to remove more ions in the same times
than “discontinuous sorbent”.
Fig. 5. bioreactor during continuous mode
In Fig. 6. are present quantities of zinc ions that sorbents
captured from solutions in calculation on 1 g weights of dry
the sorbent.
Fig. 6. Sorption of zinc ions using sorbents prepared in 2 different
modes. q – sorption � batch-continuous sorbent � discontinuous
sorbent, t – time
Conclusions
This work was oriented on preparation of iron sulphides
sorbents by sulphate-reducing bacteria for the heavy metals
removing from waters and realization sorption experiments.
From results it is clear that sorpion of copper ions was higher
than sorption of zinc ions after 90 minutes of experiments.
We can also conclude that different mode of iron sulphides
preparation reflects in sortpive capability of sorbent, because
batch-continuous prepared sorbent was more effective than
discontinous prepared.
This work was supported by the Slovak Research and
Development Agency under the contract No. APVV-51-
027705 and Slovak Grant Agency VEGA under the Project
2/0075/08.