Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 1, pp. 143−147.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
E.V. Pronina, F.Yu. Akhmadullina, R.K. Zakirov, D.G. Pobedimskii, 2009, published in Zhurnal Prikladnoi Khimii, 2009,
Vol. 82, No. 1, pp. 145−150.
AND POLYMERIC MATERIALS
Inﬂ uence of the Reagent Pretreatment of Wastewaters from
Chemical Plants on the Efﬁ ciency of Their Biological Treatment
E. V. Pronina, F. Yu. Akhmadullina, R. K. Zakirov, and D. G. Pobedimskii
Kazan State University of Technology, Kazan, Tatarstan, Russia
Moscow State Academy of Fine Chemical Technology, Moscow, Russia
Received March 13, 2008
Abstract—Structure formation in the flocculant–wastewater component system was studied by viscometry and
IR spectroscopy. Statistical treatment of the experimental data revealed regular trends in the influence of the
polymeric reagent on the efficiency of the biological oxidation of phenol, nonionic synthetic surfactants, and
oxygen-consuming compounds as a whole.
A characteristic feature of the operating biological
wastewater treatment facilities is variation of the
conditions of their functioning due to complication of
the wastewater composition and to regular discharge
of ecotoxicants and xenobiotics inhibiting biochemical
processes. As a result, the quality of the treated wastewater
ceases to meet the existing requirements. This primarily
concerns wastewater from chemical plants. One of
possible solutions of the problem is efﬁ cient pretreatment
of industrial wastewater before biological treatment.
At large amounts of wastewater, it is appropriate to use
reagent pretreatment which, owing to its advantages, is
widely applied in water treatment to recover coarse and
colloidal impurities [1–3].
In contrast to the traditional approach, the goal
of this study was to use macromolecular agents for
recovering from wastewater mainly dissolved toxic and
bioresistant compounds prior to delivering wastewater to
the biological treatment unit. Such an approach requires
ﬁ nding an efﬁ cient method for evaluating the ﬂ occulating
properties of the reagent used. In view of the speciﬁ c
features of the objects to be removed (water-soluble
impurities) and of the high molecular weight of the
ﬂ occulants, it is most appropriate to use for this purpose
the viscometric method allowing prompt monitoring of
the binding of the macromolecular reagent (MMR) with
a wastewater component .
The goal of our experiments was to reveal regular
trends in complexation in MMR–wastewater component
systems and to examine the inﬂ uence of the reagent
pretreatment of wastewaters on the efﬁ ciency of their
In model tests, we used 0.1 and 5% solutions of
modiﬁ ed gelatin [phthaloyl gelatin, PG, M = 6 × 10
and of phenol, Oksanol, and Diproksamin. The latter
compounds were chosen as control ecotoxicants, taking
into account their prevalent content in basic wastewaters
from organic synthesis plants.
To conﬁ rm the complexation in the PG–wastewater
component, we used viscometric and spectroscopic
methods. The viscosities of solutions of individual
compounds and their mixtures were determined at 25°C
with an Ubbelohde viscometer with a capillary diameter
of 0.73 and 0.86 mm.
To obtain data on the complexation mechanism, we
examined the IR spectra of the individual compounds
and binary mixtures based on them in the frequency
range 400–4000 cm
. The spectra were recorded
on a Specord 75-IR spectrophotometer from mulls in
mineral oil and thin ﬁ lms. In the latter case, a polymer
paste was uniformly applied onto a KRS-5 plate, with the
subsequent drying at 45–50°C. Mathematical processing
of the results was performed with Statgraphics Plus 3.0
Primary processing of the viscometric data involved
comparison of the experimental curve with the hypothetical
(additive) curve that would be obtained if there were no