Hello everyone,
I am conducting an isotherm/kinetics experiment to measure the capacity of a concrete filter/pervious concrete (a filter made of concrete) to remove heavy metals.
My question is, how can I measure how the percentage of the heavy metals removed is due to chemical precipitation and how much is due to the adsorption of heavy metals to the concrete filter?
Please take a look at the picture attached to see the concrete filter.
Please consider the following conditions:
The filter leaches Ca and carbonate, so precipitation happens.
The pH is constant at 12, and I cannot change it.
The adsorbent is in a filter stape as attached and is not in powder form. So, a part of precipitated heavy metal ions are trapped inside of the filter.
The picture has been extracted from Holmes et al. 2017 (Enhancing the Ability of Pervious Concrete to Remove Heavy Metals from Stormwater).
What concrete mixture you use? well i got your case is like you use a porous concrete pavement. If your heavy metal is in aquous state you can calculate the reduce of the concentration of your heavy metal through your concrete (this case only happen if you use porous concrete mixture). If you use a solid concrete mixture, you can use fly ash instead ordinary concrete. You must take attention with your mixture, so that there will be heavy metal that trapped and left behind from it. Sorry if this isnt answer that you want, I still studying too
Hi Fidelis Aldo Widhi Pangestu
Thanks for your reply. Indeed, the mixture proportions do not have a key-role in this case. It has, but not my concern at the moment.
The adsorption of heavy metals by pervious/porous concrete could be due to several mechanisms including absorption and precipitation.
However, it could be hard to distinguish between the percentage contribution of precipitation and nd adsorption in the total removal performance.
My question is whether anyone has an idea how to do that.
Fidelis Aldo Widhi Pangestu
I should also add that the application of pervious concrete is in the pavement. however, the isotherm study is done in a small jar, and the concrete is submerged in the contaminated water for a specific period of time while the water is stirredcontinuously.
For more information, you can read the following article written by John T Kevern.
Title: Enhancing the Ability of Pervious Concrete to Remove Heavy Metals from Stormwater
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