Analysis of Breakthrough Curves of Dynamic Adsorptive Removal of Pollutants from Water
И. В. Кумпаненко, Н. А. Иванова, M. V. Dyubanov, Oksana V. Shapovalova, A. A. SOLOV'YANOV, А. В. Рощин · Russian Journal of Physical Chemistry B · 2019
A comparative analysis is made of mathematical models of breakthrough curves C / C 0 = f ( t ) describing the removal of pollutants from water, where C 0 and C are the pollutant concentrations in water flows at the inlet and outlet of an adsorption column, respectively, and t is current time. It is shown that, within the Thomas and BDST (bed depth service time) models, the time dependence of breakthrough concentration C is described by the linear equation ln( C 0 / C –1) = a 0 – a 1 t , where a 0 and a 1 are coefficients, which have different meanings in different models. Approximation of experimental dependences by this linear theoretical dependence enables locating these coefficients and then, using them, calculating adsorption parameters, in particular, the adsorption rate constant k and dynamic adsorption capacity q m . These parameters are determined for processes described in the literature, namely, dynamic adsorption of Hg(II) on granulated activated carbon and activated carbon cloth and dynamic adsorption of nitrate ions on commercial anion-exchange resin PA408.