Treatment with Ozone. In order to establish the efficiency
of ozonation without catalyst, the effect of two variables (pH and
time) on COD, color, and turbidity removal was investigated. The
results are shown through Figures 1-4.
the color and turbidity reduction in
wastewater as a function of treatment time and pH. It is interesting
to note that color is being reduced as time increases and that the
trends are very similar to those observed for COD removal.
Actually, it is worth mentioning that both, CODand color profiles,
reach a plateau approximately at the same time (25 min). This
behavior and correspondence between COD and color suggests
that the coloring species are stable and are the ones to be blamed
for the lack of further COD removal. Hence, these substances are
probably amines or melanoidins, which have been reported to hardly be degraded by ozone.26 Besides, both type of compounds
are also likely to be in the mixture due to the type of
industry whose effluent has been the subject of this research. As
observed for COD removal, there is no evidence of color
removal dependence on pH.
Treatment with Ozone. In order to establish the efficiencyof ozonation without catalyst, the effect of two variables (pH andtime) on COD, color, and turbidity removal was investigated. Theresults are shown through Figures 1-4.the color and turbidity reduction inwastewater as a function of treatment time and pH. It is interestingto note that color is being reduced as time increases and that thetrends are very similar to those observed for COD removal.Actually, it is worth mentioning that both, CODand color profiles,reach a plateau approximately at the same time (25 min). Thisbehavior and correspondence between COD and color suggeststhat the coloring species are stable and are the ones to be blamedfor the lack of further COD removal. Hence, these substances areprobably amines or melanoidins, which have been reported to hardly be degraded by ozone.26 Besides, both type of compoundsare also likely to be in the mixture due to the type ofindustry whose effluent has been the subject of this research. Asobserved for COD removal, there is no evidence of colorremoval dependence on pH.
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