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Development of a microbial biofilm over 12 weeks in a flat-panel PBR. T1, after 2 weeks; T2, after 4 weeks; T3, after 6 weeks; T4, after 8 weeks; T5, after 12 weeks of incubation. No microbial biofilm was observed at T0 (data not shown). Shortly after inoculation of the PBR at T0, a light intensity of approximately 150 μmol/m2s was measured at the backside of the reactor. The light intensities with a fully developed biofilm were in the range of 10 μmol/m2s or lower (T5).
