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Vivek Patil

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About Vivek Patil

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  • Birthday May 3

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    Salt Lake CIty
  • Interests
    CO2 sequstration, reactive transport, contaminant remediation.
  1. Hello, I have an experimental data set of calcite precipitation kinetics. I want to model it in REACT using kinetic equations for two reactions: surface precipitation of CaCO3 and conversion of bicarbonate to CO2(g). I want to optimize the values for various kinetic parameters (different rate constants, surface area etc) in these two reactions, such the combined outcome matches measured values from my dataset. Are there any ways to apply some kind of optimization algorithms within GWB? Or is this something that I'll have to do externally? I am using GWB 9.0. Thanks in advance!
  2. Hi Brian and others, I have a GWB 9.0 license installed on my windows 8 machine. I am considering upgrading to windows 10. Will this affect the functioning of GWB 9 in anyway? Has anyone tried it on versions prior to GWB 10? Thanks, Vivek
  3. Hello Brian and others, We collected some water composition data of a CO2-saturated spring. I tried to calculate the speciation, mineral saturation and charge imbalance using SpecE8. However, the charge imbalance calculated by SpecE8 is 11.09% while my manual calculations tell me it is 3.55 %. I am not sure why this is happening and if I am going wrong somewhere. I am not allowed to attach excel sheets here but I am attaching the input file of SpecE8. I used GWB 9.0. Thanks in advance for any help. Best, Vivek CGwater.sp8
  4. Thanks a lot Brian! I greatly appreciate your help! Best, Vivek
  5. Hi Brian, Thanks for your replies. I tried and made changes to my models according to your suggestions. Also my group purchased two new licenses for GWB 9.0 so I am now working on it. I realise that GWB 9 can handle more kinetic laws than 8. Some of my models having a lot of kinetic reactions run on 9 while crash on 8. Am I right? Can you tell me the maximum number of kinetic rate laws that gwb 9 can handle for a system similar to one in my previous posts? Also I want to specify different rate constants for precipitation and dissolution of a single mineral. Do I need to put two en
  6. Hi Brian, Thanks for a very prompt and helpful reply. I will try as you suggested by putting one kinetic rate law at a time with carbonates going in the last. I have considered a flow through system, however I wanted to do a stagnant system as a preceding step to it. Indeed a flow system might be more realistic. As for O2(aq), I was expecting small amount of Hematite and the model didn't allow me to precipitate Hematite without O2 in the basis. One more issue that I sometimes face in GWB (not in this particular simulation): When I try to pick up the entire system (after a reaction pat
  7. Hi Brian and all, I am trying to do this particular simulation to study kinetic water-rock interactions in presence of CO2. Please find my .rea file attached. I used GWB 8.0. In my simulation I first define my initial equilibrium by swapping the rock minerals into the basis. Then I react 50 kg of CO2(g) over 50 years. After 50 yrs the CO2 feed is stopped and reactions are traced till 1000 yrs. I suppress all the minerals except primary minerals and those secondary minerals that I except to form along the reaction path. My simulation completes when I define all the minerals at equilibri
  8. Hello GWBers! I am using GWB 8.0 and this question has been troubling me ever since I started using GWB. How to specify the total pressure on the system, be it in REACT or XT. Sometimes, you want to simulate reaction at certain depth in subsurface where the pressure is greater than atmospheric. Please help. Many thanks! Vivek.
  9. Roserun.reaHello, I want to calculate the equilibrium between a given brine and given initial fugacity of CO2 (simulating dissolution of CO2 in brine). To do that I specified the brine composition in REACT and swapped CO2(g) with HCO3- in the basis. I mentioned the initial fugacity as 100 atm and let it run. The equilibrium fugacity of CO2(g) is about 175 atm. I am using GWB 8.0 version. I am attaching here the REACT input file that I am using. Please help me figuring this out! Many thanks in advance, Vivek.
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