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SORPTION CAPACITY OF TECHNOGENIC PEAT TOWARD URANIUM IONS AT PRESERVATION OF LOW-LEVEL RADIOACTIVE WASTE STORAGES
Abstract
In the present study, in laboratory conditions, a series of experiments were conducted to study the immobilizing ability of peats of Electrochemical Plant (Zelenogorsk, Krasnoyarsk Krai, Russia). It has been found that the studied sorbents have a significant sorption capacity and a reliable conservation ability towards uranium ions that prevent its spread outside the sludge storage. For quantitative characterization and calculation of sorption coefficients, laboratory experiments were conducted for three samples of peat and one sample of bottom sediments of the Syrgil creek. The adsorption data could be fitted to a Freundlich adsorption isotherm and the maximum adsorption capacity was determined to be 80±1% for peat deposits and 79% for bottom sediments. Binding of potentially toxic element to humic acids proceeds presumably through an ion-exchange mechanism based on the sorption properties of carboxylic sites with the formation of hardly soluble humates. Experimental modeling of sorption processes confirms that organic matter of peat is effective contributors to radionuclide scavenging.
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References6
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