I would be very grateful for a response to the following problem:
I am modelling F- removal with calcite in a column packed with granular calcite (12 moles or ~1.2kg). The influent concentration of F- is 2300 mg/L (as NaF) using ADVECTION with 40 cells & 600 shifts (15 pore volumes).
On analysis of the results I find that the entire amount of calcite is used up within 6 pore volumes!!! and therefore 455.4 GRAMS of fluoride are precipitated which would require about 200 litres of my solution.
I believe this is a due to the fact that the area of the column is not specified (or controlled) and therefore the actual volume (and hence F mass) passing through the column is much greater than it should be.
Is there a way of limiting the volume of the influent solution passing through the column or programming PHREEQ so that the surface area can be taken into account??
I am using PHREEQC Interactive Alpha version 2.4.2
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1980 since Jan 22, 1998.