Once you get the cellulose pulp from the algae, you can dump it right back into the power plant furnace or the in-box of the coal-to-liquids conversion factory that produced the CO2 that grew the algae in the first place.
Or, you can press it into flat sheets and print your Intel's on it - then collect the papers and dump them back in with the coal.
Coal power and liquid fuel plant emissions could - and should - be seen as a resource rather than a pollutant.