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A strategy based on photo sequencing batch operation was used to selectcyanobacteria over unsettled green algae in a wastewater treatment system,evaluating for the first time the effect of hydraulic regimes on nutritionaldynamics and microorganisms competition. During 30 days of operation, aninitial microalgae mixed consortia dominated by the green microalgaeScenedesmus sp. was cultivated in two different photo-sequencing batch reactorsoperated at hydraulic retention time (HRT) of 6 days (PSBR6) and 4 days (PSBR4)at a theoretical solids retention time (SRT) of 10 d. Both reactors werecompared with a semi-continuous reactor (SC10) operated at 10 d of HRT and 10days of SRT (used as a control). The results indicated that PSBR6 and PSBR4decreased Scenedesmus sp. population by 88% and 48%, respectively. However,only PSBR6 provided suitable conditions to select cyanobacteria from an initialgreen algae dominated culture. These conditions included volumetric loads of11.72 mg TN L-1d-1, 2.04 mg TP L-1d-1 and 53.31 mg TOC L-1d-1. The remainingnutrients in the culture led also to a phosphorus limiting N:P ratio (34:1)that improved the increase of cyanobacteria from an initial 2% until 70% of thetotal population. In addition, PSBR6 reached a biomass production of 0.12 gL-1d-1, while removing TN, TP and TOC by 58%, 83% and 85%, respectively.Conversely, the application of higher nutrients loads caused by lower HRT(PSBR4) led to an increase of only 13% of cyanobacteria while SC10 remainedwith the same biomass composition during all the experimental time. Thus, thisstudy showed that the dominance of cyanobacteria in microalgal based wastewatertreatment systems can be controlled by the operational and nutritionalconditions. This knowledge could contribute to control microalgae contaminationfrom up-scaling cyanobacterial biomass production in wastewater treatmentsystems.

Selection of cyanobacteria over green algae in a photo-sequencing batch bioreactor fed with wastewater