Abstract
Abstract. Sorption of metals on minerals is a key process in treatment
water, natural aquatic environments, and other water-related technologies.
Sorption processes are usually simulated with surface complexation models;
however, identifying numeric values for the thermodynamic constants from
batch experiments requires a robust parameter estimation technique that does
not get trapped in local minima. Recently, particle swarm optimization
(PSO) techniques have attracted many researchers as an efficient and
effective optimization technique to find (near-)optimum model parameters in
several fields of research. In this work, uranium at low concentrations was
sorbed on quartz at different pH, and the hydroPSO R optimization package was
used – the first time – to calibrate the PHREEQC geochemical model,
version 3.1.2. Results show that thermodynamic parameter values identified
with hydroPSO are more reliable than those identified with the well-known
parameter estimation (PEST) software, when both parameter estimation software
are coupled to PHREEQC using the same thermodynamic input data. In addition,
post-processing tools included in hydroPSO were helpful for the correct
interpretation of uncertainty in the obtained model parameters and simulated
values. Thus, hydroPSO proved to be an efficient and versatile optimization
tool for identifying reliable thermodynamic parameter values of the PHREEQC
geochemical model.
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