This is column experiment, at different flow rates of washing agents.
Dear Sir. Concerning your issue about the models that can be applied for metal removal by soil flushing. The numerical model developed to simulate the EDTA chelation process of metal (lead) applied to a soil flushing remediation action. The model considers the non–stationary conditions, typical of unsaturated soil. Flow and transport equations are solved simultaneously. Metal mobilization is evaluated considering both the chemical aspects of chelating agents and the characteristics of the different soil fraction at which the metal can be bound. A system of first order reactions is implemented and, for each fraction, two different mobilization kinetics (slow and fast) are considered. The model was calibrated and validated using laboratory experimental data. Results confirm that the model can represent an evaluable tool to assess the feasibility of soil flushing application for heavy metals contaminated soil, especially in the case of surface layer contamination. It is useful to optimize the operating parameters (chelating dosage, application mode and treatment thickness) in order to achieve the maximum treatment efficiency while minimizing potential environmental impacts. I think the following below links may help you in your analysis:
https://pdfs.semanticscholar.org/c4ac/2aae9f40fa147ad14a86e27d1a0dc29eff9a.pdf http://www.bioline.org.br/pdf?st10048
https://www.jstor.org/stable/25164678?seq=1#page_scan_tab_contents
https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.highlight/abstract/5783
Thanks
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