Effect of pH Change on the Microalgae-Based Biogas Upgrading Process

An alternative way to remove CO2 from biogas is the use of photosynthetic microorganisms, such as microalgae. This can be achieved by operation an open photobioreactor, connected with a mass transfer column, counterflow column. technology provides up-graded high quality. The microalgal uptake in columns generates pH changes microalgae culture. To clarify potential effect these dynamic conditions culture, change on activity and PSII quantum yield was studied for Chlorella sorokiniana. Thus, assays were carried out, where drop reported replicated batch culture through HCl addition injection, moving 7.0 5.0 5.8, respectively. Moreover, light/darkness tested when decreased. results obtained this research showed that decreased light shifted injection. Despite this, value remained at 0.6–0.7, which means did not suffer negative system cells because efficiency remained. In same way, indicated corrected, recovered. apparent affinity constant dissolved inorganic carbon (KDIC) 0.9 µM 5 112.0 7, suggests preferred source C.sorokniana CO2. Finally, all counter-flow column upgrading cause permanent damage system, decrease result recovered corrected.