Dear David, I have a question concerning KINETICS: I want to model kinetic oxidation of both organic carbon and ammonium in groundwater. For this, I created two monod kinetic rates for Orgc_ox and AmmH_ox. To test the kinetics, I created an input file (see attach) with orgc, amm and oxygen present. Results (output_phreeqc.xls) show that nitrate is increasing when ammonium is oxidated (as I expected), but once oxygen is depleted, my results show a decrease in nitrate that I can't explain. Another thing is that when I set the concentration of orgc to a low value (my background water does not contain organic carbon) the model won't run and tells me that it has negative concentration for orgc (error message). My question now is if there is a way of "telling" the program that there is no organic degradation when there's no orgc present. best regards, bruno -- Bruno Haerens Hydrogeology & Engineering Geology Dpt. Geography-Geology Katholieke Universiteit Leuven (KULeuven) Redingenstraat 16 B-3000 Leuven (Belgium) Tel. +32 16 326449 Fax: +32 16 326401 http://www.kuleuven.ac.be/geology/hsg/H&EG/H&EG.html
Attachment:
input.pqi
Description: Binary data
Attachment:
output_phreeqc.xls
Description: MS-Excel spreadsheet
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