Computer experiment as a method for evaluating the efficiency of water purification in the flow and countercurrent regeneration of ion exchange filters
Abstract
The aim of this work is to compare co-current and countercurrent regeneration modes in water puri-fication cyclic process on the strong-acid cation exchanger KU-2. Numerical experiments were performed for each cycle which included a sequential calculations for the stages: sorption, regeneration, washing before stabilization at a given amount of reagent for both regeneration modes. Variation of the amount of the rege-nerative solution was carried out in a wide range
Two types of water, differed from each other in total salt concentration and in the ratio of sodium to the sum of calcium and magnesium, were selected for the comparative study. For each type, water treatment processes were calculated at two values of the degree of purification. The computer experiments were carried out using the program «Createscheme».
Comparison of the efficiency of the regeneration process in the co- and countercurrent flow direc-tions of a regeneration solution was performed on the basis of dependence of the relative amount of purified water, which can be produced on the same bed of the cation exchanger in a hydrogen form, on the amount of the reagent to be used. For both types of water differing in composition and at different requirements to the purification degree, countercurrent regeneration was shown to be more efficient compared to the co-flow mode. Quantitatively, this efficiency depends on the ratio of one - and two-charged ions in raw water and the specified degree of purification. In the entire considered range of changes in the reagent input, the output of purified water of the specified quality is greater at the countercurrent regeneration. The advantage of this regeneration mode is especially pronounced at higher relative content of single-charged sodium ion in fed water and at deeper purification.
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References
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