Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 6, pp. 1149−1152.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
A.F. Dobrynina, G.G. Abdullazyanova, Yu.Yu. Khomich, V.P. Barabanov, Yu.G. Galyametdinov, 2008, published in Khimicheskaya
Promyshlennost’, 2009, Vol. 86, No. 2, pp. 45−50.
Intensiﬁ cation of Water Puriﬁ cation by Reagent Method
A. F. Dobrynina, G. G. Abdullazyanova, Yu. Yu. Khomich, V. P. Barabanov,
and Yu. G. Galyametdinov
Kazan State Technological University, Kazan, Russia
Received December 16, 2008
Abstract—On the example of real dispersal system (effluent) are tested coagulants and flocculants of different
nature. A decrease in the content of harmful impurities after working up of the system by the reagents is established
by the methods of physicochemical analysis.
The efﬂ uents entering into the cleaning facility of the
joint stock company “Almetevsk water channel” contain
the pollutants of organic and inorganic nature. The
admixtures in the efﬂ uent are the result of the activity of
industrial, housing and agricultural objects and determine
the combined nature of the efﬂ uents. The complexity of
the chemical composition of efﬂ uent, the large volume
of the workable drains, the inﬂ uence of external factors
(temperature and pressure), the presence of the extreme
ejections of pollutants substantially decrease the vital activity
of the bacteria of the active silt, the basic cleaning agent of
the technological chain of water puriﬁ cation [1, 2].
Under the conditions of the increased volume of
drains entering into the operational cleaning facility,
besides the biological cleaning can be applied the reagent
stage of cleaning based on the use of coagulants and the
compositions of coagulants with the ﬂ occulants.
The purpose of this work was the study of the inﬂ uence
of coagulants and flocculants on the quality of the
puriﬁ cation of waste water of complex composition at the
joint stock company “Almetevsk water channel.”
The chemical composition of the water entering into
the cleaning facility, is given in Table 1.
The salts of aluminum and iron were used as the
coagulants: aluminum sulfate (AS) GOST (All-Union State
Standard) 12966-85; liquid aluminum polyoxychloride
(OCAliq) GOST 3759-75; aluminum polyoxychloride
crystalline (OCAcr) TU 6-00-05795731-250-96; iron
chloride (IC) GOST 4147-74. As the ﬂ occulants were
used the flocculants of the sort “Praestol”, its main
characteristics are given in Table 2 [3−5].
A study of the processes of coagulation and ﬂ occulation
was carried out by the methods of the clariﬁ cation  and
of spectrophotometry .
RESULTS AND DISCUSSION
In Fig. 1 are depicted the curves of clarifying of the
efﬂ uent samples, which are the colloidal systems, at the
optimum concentrations of coagulants. The analysis
of curves shows that the most effective coagulating
properties possesses crystalline aluminum oxychloride,
providing aggregation and precipitation of particles (with
the degree of clariﬁ cation H = 70−80%) in 10 minutes.
Attention is drawn to S-shaped nature of the curve of
clariﬁ cation in the presence of this coagulant. The initial
section of the curve can be explained by the destruction of
crystal structure. The steep climb of curve in the region of
the time spaces of 5−10 minutes testiﬁ es about the active
aggregation of particles as a result of the processes of
Figure 2 gives the results of measuring of the optical
density of dispersal system in the presence of coagulants.
The data obtained by this method indicate sufﬁ ciently
wide region of coagulation in the presence of crystalline