Input ranges

[Model1]

Dear,

I would like to select the potential reactions that can occur in wastewater treatment facilities.
To this end, I have set-up realistic ranges for the wastewater input characteristics (nutrient contents, pH, temperature, etc.). Is it possible to use PhreeqC for calculation of the potential outputs (i.e. to check for example which precipitates can become oversaturated) within the selected ranges of the inputs ? Or do I have to reintroduce the input values for each possible scenario ?

Thanks in advance.

[dlparkhurst]

For a first cut, I think that maximum values for all the parameters (and probably maximum pH, minimum temperature) would give SIs that indicate which phases could precipitate.

Not sure how you want to get more specific. There are probably many, many combinations. It is conceivable that you could arrange a multidimensional set of parameters with, say, min and max of each parameter. I would use IPhreeqcCOM and some kind of scripting language (Matlab, Excel (VB), Python) (also could use IPhreeqc and a programming language) to go through a set of many combinations.

[Model1]

Thank you.

I was thinking about the following strategy:

First test all possible combinations  using the maximum/ minimum values of all parameters and input variables.

Next, test for each unit the composition of 20 different waste flows under differing operating conditions. I would allow the increment of one operating parameter at a time within its range, and put the other parameters fixed, e.g. using:
REACTION_TEMPERATURE
25 75 in 51 steps

[dlparkhurst]

Seems feasible. The only questions are how many combinations do you want to set up and how hard will it be to write the instructions to do the calculations.