Figure 1: Scanning electron micrographs of the surface of ceramic beads. A – beads without treatment; B – beads pretreated with molasses (by submerging the ceramic beads in 30% molasses during 5 hours, then discarding the excess liquid and drying at 60°C for 24h). C, D - the cells of PNN consortium attached on the bead surface (inoculum of PNN consortium was incubated over a 7 day period in medium in the presence of ceramic beads at 22°C, at air flow rate of 0.28 L/min).