Natural Organic Matter and Humic Substances Interactions

3. Results and Discussion
15th IHSS Meeting- Vol. 3
Considering only the relationship of the mass of each of the fractions isolated in the MOD
XAD-8 and XAD-4, it was found that the largest proportion of the DOM Itapanhaú River
water is represented by the fraction HPOA (46%), and smaller quantities HPI fractions (18%),
TPHA (15%), TPHN (11%) and HPON (10%). It justifies the use of the methodology of
Thurman and Malcolm (1981) [8] to obtain the SHA River water Itapanhaú.
The results of the coagulation filtration tests on water samples I to IV using aluminum sulfate
as a coagulant are shown in Figures 2a to 2d.
a) Results of Water Sample I b) Results of Water Sample II
c) Results of Water Sample III d) Results of Water Sample IV
Figure 2: Diagram of aluminium coagulation and color removal domains for water samples I to IV
In water sample I (Figure 2a), Zone 1 for ≥ 95% removal is defined by the pH ranging from
4.7 to 5.3 and aluminum dosages between 1.9 and 2.7mg L -1 , Zone 1.1 for ≥ 95% removal is
defined by the pH ranging from 5.5 to 6.0 with aluminum dosages of > 3.5mg L -1 Al. Zone 2
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