1070-4272/05/7809-1454C2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 9, 2005, pp. 1454 !1456. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 9,
2005, pp. 1479!1481.
Original Russian Text Copyright + 2005 by Korchagin, Sklyadnev.
OF CHEMISTRY AND TECHNOLOGY
Treatment of Highly Concentrated Wastewater
with Spent Activated Carbon
V. I. Korchagin and E. V. Sklyadnev
Voronezh State Technological Academy, Voronezh, Russia
Received February 3, 2005; in final form, July 2005
Abstract-Sorption of the main polluting components of the wastewater from production of emulsion
butadiene!styrene rubbers, soaps of synthetic and fatty acids and Leukanol, was studied on a preliminarily
ground spent AG-3 activated carbon.
The world demand for adsorbents is expected to
steadily grow in the future, since the amount of the
water consumed tends to grow, and the quality of
natural water is constantly deteriorated. Also, adsor-
bents are widely used in water and gas treatment.
The use of adsorption processes suitable for exhaus-
tive removal of organic compounds, in particular, sur-
factants, is hindered by complicated and expensive
regeneration of adsorbents. For example, it is known
 that regeneration of activated carbon costs approxi-
mately half as much as fresh carbon.
A peculiar way to solve the problem of sorption
pretreatment of highly concentrated wastewater is
the use of activated carbons from the main production.
In particular, spent OU-A activated carbon from
pharmaceutical production can remove 60382% of
organic pollutants from wastewater .
It is known  that sorption of technical surfac-
tants involves no more than 1% of the surface area
of SKT activated carbon, no more than 10315% of
that of KAD carbon, and no more than 20325 of that
of activated anthracite.
In sorption of surfactants, the surface of the sorbent
macropores is of critical importance, as seen from
characteristics of sorbents in : SKT activated car-
bon has a macropore volume of 0.27, and KAD acti-
vated carbon, 0.52 cm
. This can be confirmed by
the data of Kisel’gof and Mikhailov  who reported
that absorption of fairly hydrophilic Leukanol occurs
on the sorbent surface.
It seems reasonable to use spent AG-3 activated
carbon from the butadiene distillation stage of syn-
thetic rubber production in treatment of highly con-
centrated wastewater from production of emulsion
butadiene3styrene rubbers to remove surfactants, since
AG-3 with a macropore volume of 0.413 0.52 cm
 belongs to macroporous sorbents, and the problem
of its utilization still remains to be solved.
Specific pollutants in wastewater (serum) from the
emulsion butadiene3styrene rubber coagulation stage
are soaps of resin and synthetic fatty acids contained in
the wastewater in amounts of ca. 500 mg dm
, as well
as Leukanol, contained in amounts of 400 mg dm
Leukanol belongs to [biologically hard] surfactants
and occurs in water as individual molecules and asso-
ciates, which complicates its sorption on granulated
The Leukanol concentration in solution was deter-
mined on an SF-46 spectrophotometer. In the UV
region, the spectrum of Leukanol contains absorption
bands with maxima near 227 and 235 nm. The Leuka-
nol concentration was measured accurately to within
5.0 wt % .
Resin and synthetic fatty acid soaps were analyzed
by direct titration with an alkali upon extraction from
a model wastewater with an organic solvent, diethyl
The total pollution indicator, chemical oxygen
demand (COD), was determined titrimetrically :
Organic substances were oxidized with excess potas-
sium dichromate in an H
solution under heating
in the presence of a catalyst, silver sulfate. The resid-
ual potassium dichromate was determined by titration
with a Mohr’s salt solution, and the difference gave
the amount of K
spent for oxidation of organic
Testing preliminarily ground spent AG-3 activated
carbon as sorbent in treatment of highly concentrated