I think that there is a limitation in the availability of sequestering or capturing sites in

your bio-filter.  So if you increase the concentration of CO2 when some of the sites are already occupied with CO2, the rate of sequestration would be lowered. But since CO2 is acidic when it meets water, you might consider increasing the pH in the bio-filter

to increase the rate of capture in CO2. Higher pH in the bio-filter would turn CO2 into HCO3-  ions which are themselves more neutral. I hope that helps.

Eugene

Hi Amin, the CO2 is part of the carbon cycle, so like Eugene Said, you must to understand that there are diffrent variables involved.

The pH is one of that and you must to try with some buffer that maintains the pH but then you must to control it, because if in your bio.filter are using micro bacteria or grass or some biological species, sometimes could be affected by the pH increase or decrease, the temperature is another factor of absorption in water, if there are low temperature your efficiency could increase, but if this increase, the effect decrease.

finally there are some considerations related with your bio-filter about the kind of process are you going to use. (grass, calcium support, rizomas, etc) depending the filter could be your right answer.

Bioreactons aside, CO2 not only dissolves in water but it also reacts to form H2CO3 and then enters the proton equilibria mentioned previously. The rates of these reactions should be known may not increase as you expected with CO2 concentration

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