The software program "Extr_Sorb" for calculation and visualization of ion-exchange technological scheme, simultaneously providing purification of solutions and extraction of target component
Abstract
The purpose of study is to create the software program for design the technological schemes of ionexchange purification of solution from the target substance with simultaneous concentration of this substance from the purified solution. The methodology of work is modelling in the interactive mode the dynamics of sorption at a linear isotherm for film and particle diffusion in the technological scheme representing a chain of filters operating in merry-go-round mode. Purification of a solution is performed until the breakthrough of target component. Then the process duration is defined. At this moment, the volume of the sorbent bed at the head answering to the required enrichment level with the target component is calculated. After removal of this volume, the same one of a sorbent in initial ion form is added at the tail of the scheme, and the process repeats.
As a result of studies, the Extr_Sorb software program is created and realized in two options: at the preselected value of loading degree for the disconnection of the part (fragment) of sorbent bed, the length of this part is calculated, or with the preselected length of a fragment, the level of it’s working off is defined. Purification time period for these conditions is estimated. The program is approved by the example of the purification of low-mineralized waters from radionuclides on clinoptilolite. The visualization of the process reflects the results of calculation of consecutive iterations (cycles) until the stabilization which is characterized by identical values of cleaning time and the size (or loading level) of the disconnected fragment for two successive iterations.
The Extr_Sorb software program allows the calculation of technological cycles in each of which, the heading part of column bed loaded with sorbed substance to a required level, is withdrawn from the sorption mode and can be used for low-waste technologies of sewage treatment.
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