ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 6, pp. 951!954. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + S.M. Azarov, I.L. Shashkova, A.I. Rat’ko, T.A. Azarova, N.V. Mil’vit, S.V. Shemchenok, V.V. Dmitriev, 2007, published in
Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 6, pp. 973!976.
OF CHEMISTRY AND TECHNOLOGY
Regeneration of Ceramic Filter Cells
for Water Purification
S. M. Azarov, I. L. Shashkova, A. I. Rat’ko, T. A. Azarova, N. V. Mil’vit,
S. V. Shemchenok, and V. V. Dmitriev
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus,
Received January 16, 2007
Abstract-Regeneration of ceramic aluminosilicate filter cells for water purification by chemical methods
and, in particular, by acid dissolution of the deposit formed in filter pores was studied.
Filter cells are regenerated to restore their rated
service characteristics. In this case, a filtering body is
to be regarded as a combination of two phases: a ce-
ramic and a contaminating substance, i.e., as a spe-
cific state associated with the dispersity of particles
forming the porous body and with phenomena in
pores, caused by their appreciable curvature and by
the nature of interactions at interfaces between the ma-
terial of a filter cell and a contaminant. Specific fea-
tures of the regeneration are determined in the case
under consideration by the specificity of the dispersed
state of the contaminant in pores of the ceramic
and should be manifested in kinetic dependences of
the influence exerted by the regenerating medium on
the mechanism of restoration of the service char-
Ceramic aluminosilicate filter cells are used for
removal of mechanical admixtures of varied origin
and colloid particles of iron hydroxide from drinking
and return water. Ceramic filter cells have a multilayer
porous structure, with the pore size successively de-
creasing from layer to layer.
In this communication, we present the results ob-
tained in a study of the process of regeneration of ce-
ramic filter cells for water purification, manufactured
in Belarus and used at various plants of the Republic.
The chemical composition of deposits filtered-off
from drinking and return water was studied, and pos-
sibility of regeneration of ceramic filter cells by
chemical methods and, in particular, by acid dis-
solution of the deposit formed in filter pores was
The regeneration was experimentally studied on
segments of tubular filter cells with an external diam-
eter of 70 mm and height of 50 mm, built in the wa-
ter supply system of the Institute, using a laboratory
The working capacity of a filter is defined as the
volume of water passed before loss of 95% of the ini-
tial throughput of filter cells. The ratio of the initial
throughput and working capacity after regeneration to
the values of these characteristics before regeneration
was taken as the degree of regeneration (%).
In the study, we used filter cells selected after tests
at industrial plants and at housing and communal
facilities, as well as those used in water recycling sys-
tems at industrial plants.
The initial throughput and working capacity of
starting filter cells before exploitation were measured
for a set of witness samples to be, on the average,
0.38 l s
and 960 l, respectively.
In chemical regeneration, a filter cell segment was
steeped in a 1!20% hydrochloric acid solution and
kept in this solution for 2!24 h. Then the filter cell
was washed with water, and its restored initial through-
put and working capacity were measured.