Mathematical simulation and calculation of the process of water demineralization in industrial filter Part 3. Influence of the cation-exchanger backwashing stage on regeneration and following water purification processes

Abstract

The aim of the work was to study the influence of the intensity of bed backwashing on water purification
process.
Experiments were carried out at the Novocherkassk Power Plant central desalting unit, on an industrial
filter loaded with the fresh cationic resin KU-2 in hydrogen form. Backwashing the filter before regeneration
was carried out in several successive working cycles at different flow rates. For analysis of the sorbent
on sodium, magnesium, calcium and hydrogen content, the samples of cationic resin was taken at several
points along the column bed before and after backwashing by the use of special sampler. Experimental
distribution of cations in the resin bed was compared to the calculated data obtained with the use of the
«CREATESCHEME» program under the assumption of complete mixing of a sorbent bed.
Good agreement between experimental data and the results of calculations for industrial scale process
approves the validity of model premises including the fact of full mixing the resin bed at backwashing
stage, independently on the flow rate of washing water in the range of used conditions.