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PROGNOSIS FOR FIXED BED CLIPTILOLITE PERFORMANCE IN THE PROCESS OF METAL IONS REMOVAL
Abstract
Laboratory investigations on zinc ions removal from model solution in a column with fixed bed zeolite clinoptilolite were conducted. Experimental dynamic curves for sorption depending on the bed height of zeolite and velocity of treated solution were received. The main constant parameters characterizing the process at breakthrough were defined. It was established that the bed column volumes of solution and the capacity at breakthrough increase with increasing of contact time, whereas sorbent usage rate decreases. For modeling of the process and for prediction of column service duration at breakthrough (residual concentration of zinc ions 0,2 mg.L-1) Shilov, BDST and Clark models were applied. The modeling was done on the base of dates of experimental dynamic curves at velocity of 5, at four different bed heights and equilibrium sorption isotherm of zinc. The calculated results on the models have been compared with the experimental results. Validity of the Shilov model was established. Clark model is suitable to predict type of dynamic curve at breakthrough C under 0,3. It was established that BDST model basing on the precondition for symmetric dynamic curve could not be use. The failure of the BDST model to explain the fixed bed results and the analysis of the rate data indicate that the adsorption mechanism is complex.
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References11
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