From the paper:

"We have already scaled this system up to two-and-a-half liters dimensions, which can deal with around 0.1 liter of CO2 per minute. And we've tested that running continuously for a whole month and the efficiency of the system did not degrade."

2.5l column runs 6 liters per hour.

494,109.34 Liters per ton of co2, so... lots of columns are needed. 82,352 columns per ton per hour, lol.

If you made a giant pool reactor it would be 206 cubic meters of space, so 15x15x1 meters, or about 50x50 feet.