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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
Thanks,
Brett Turner.
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