Journal article

Steady-state modelling of biogeochemical processes in columns with aquifer material: 2. Dynamics of iron-sulfur interactions

Serial data from column experiments were used to develop a dynamic model to describe the evolution of concentration profiles of redox-sensitive chemical components such as iron(II), sulfate/sulfide, FeOOH(s), and FeS(s). The experimental results were gained from a study with a laboratory column filled with aquifer sand and operated in a water-saturated state. "Reduction of sulfate'', "reduction of FeOOH(s)'', ''formation of FeS(s)'' and ''precipitation of FeS(s)'' were identified as slow nonequilibrium reactions. The rate coefficients of these processes were determined by using an extended version of the program STEADYQL in combination with the parameter optimisation program SUFI. Based on this kinetic information it is possible to carry out prognostic modelling of the propagation of a sulfide plume in an anaerobic aquifer if the main characteristics of thr solids' surfaces are known.


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